Woody-Invaded Meadow to Conservation Meadow

Restoring Your Woody- Invaded Meadow to Conservation Meadow

The author of this Restoration Guide is Laura Phillips-Mao, University of Minnesota. Steve Chaplin, MN/ND/SD Chapter of The Nature Conservancy, administered the project and helped with production. Marybeth Block, Minnesota Department of Natural Resources, provided review and editorial comments. Susan Galatowitsch, University of Minnesota, contributed to an earlier version of this guide.

©The Nature Conservancy January 1, 2017

Funding for the development of this restoration guide was provided by the Minnesota Environment and Natural Resources Trust Fund as recommended by the Legislative-Citizen Commission on Minnesota Resources (LCCMR) through grant LCCMR092C. The Trust Fund is a permanent fund constitutionally established by the citizens of Minnesota to assist in the protection, conservation, preservation, and enhancement of the state’s air, water, land, fish, wildlife, and other natural resources. Currently 40% of net Minnesota State Lottery proceeds are dedicated to building the Trust Fund and ensuring future benefits for Minnesota’s environment and natural resources.

Additional funding for the update and redesign of the guide was provided by a Working Lands Initiative grant from the Minnesota Department of Natural Resources.

Cover photo taken at Twin Valley Prairie by Justin Meissen.

uses or high-impact recreational activities such Restoring Your Woody- as driving ATVs. Invaded Meadow to Compatible land uses include: “Conservation Meadow”  Carefully managed grazing for habitat 1 In this guide, you will learn the basic steps to goals restore a degraded meadow invaded by woody  Haying for habitat goals species to a conservation meadow. The precise  Occasional seed harvest restoration actions will depend on the particular  Low-impact recreational activities, such as features of your site as well as your budget, hiking, photography, or hunting preferences and project goals. Conservation benefits include improved water When planning your restoration, we quality, flood control, and habitat for birds, recommend you consult with restoration animals and insects. Conservation prairie can professionals to evaluate your site’s unique also buffer high-quality native meadows and characteristics. Please visit prairies and support threatened and nature.org/MNPrairieRestorationGuides for endangered plants and animals that depend on more information on who to contact or other large contiguous areas of grassland. publications that cover site assessment protocols. Why restore woody-invaded

What is conservation meadows? meadow? Meadows that are not burned, grazed or mowed are often invaded by woody trees and Conservation meadow is a wet grassland shrubs. In wet meadow prairies, shrub and tree designed to closely mimic native wet prairie cover is tied to fire frequency. Fire suppression and sedge meadow using seed mixes that have can lead to increased cover of native shrubs, many native species adapted to the restoration such as sandbar willow, and invasion by native site. It occurs on poorly-drained, wet to trees, such as quaking aspen and balsam moderately wet soils that are saturated up to 8 poplar. Over time, the wet grassland may weeks following snowmelt and are prone to transition to wet brush prairie or even temporary ponding after large rainfall events. woodlands. Returning fire to wet meadows and Conservation meadow often occurs in a controlling trees and shrub invasion is transition zone between emergent marsh and important to protect and maintain wet meadow upland prairie and may be either sedge- systems. dominated (“sedge meadow”) or grass- dominated (“wet prairie”) depending on the For the purposes of this guide, we define a duration of soil saturation. woody-invaded meadow as having a canopy cover of more than 10% trees and shrub The diversity of plants in conservation meadow thickets, and an understory dominated by provides habitat and food for native wildlife and native species (>75% cover), although this insects, including pollinators. A wide variety of native understory may be sparse as a result of 2 flowering plants and grasses is also visually shading by trees and shrubs . Meadows are interesting to people. Conservation meadow is also often invaded by herbaceous (non-woody) not suitable for forage production, commercial perennial weeds, such as reed canary grass.

1 Very wet sites are vulnerable to damage by trampling and are dominated by sedges, which are not preferred forage for cattle. Moderately wet sites, which are dominated by grasses and have a shorter duration of seasonal ponding, will generally be more suitable for grazing. 2 Woody-invaded prairies and meadows are not the same as oak savannas. Oak savannas occur on mesic to dry soils, have a mature oak canopy and a prairie/savanna understory, and are a rare and highly-valued landscape.

This guide assumes that woody invasion is the  Seedbed Preparation – Prepare a seedbed to greater threat on a site, but if other invasive ensure good seed-soil contact and promote species are present they will also require germination of planted seeds. control measures.3  Seeding/Planting – Select seed mixes and

Woody seedlings and saplings may be seeding methods that are well suited to the controlled by herbicide applications and fire, in site and project goals. Or, in the case of a manner similar to invasive perennial weeds, small sites of less than half an acre, but larger trees and dense shrub thickets consider hand-planting plugs for quicker require mechanical removal. The bare or results5. sparsely-vegetated patches left behind after  Hydrologic Restoration – Remove drainage woody species removal are vulnerable to invasion by exotic species. Reintroducing features by breaking tile or plugging ditches prescribed burns will help promote greater to restore the site’s original soil moisture biomass production and cover of meadow and seasonal flooding patterns. species. Interseeding may also prevent the  Establishment & Aftercare – Control weeds encroachment of invasive plants by more and promote the establishment and growth quickly filling in the gaps left behind by tree of meadow plants through the first few removal. years after seeding.

Additionally, if the site has been drained with  Long-term Management – Maintain the drainage tiles or ditches, restoring hydrology by health and diversity of native meadow into breaking tiles, plugging ditches, and—in some the future. cases—installing water control devices, will be required. This guide assumes that your site is wet to moderately wet and has been drained via tiles or ditches4. Sites that have not been How long will it take? drained will not require the additional steps to restore the hydrology. Removal of invasive woody species can be accomplished within a single growing season, depending on the extent of the invasion and resources available. Removal should precede What will it involve? interseeding with native species. The more you invest in up front weed control, the less time Meadow restoration typically includes these and effort you will need to spend controlling basic steps: weeds in the long term. After the year it’s  Site Assessment— Identify the site seeded, expect to spend at least three to five years on aftercare to ensure good characteristics and define goals for the establishment of the utility meadow. This restoration. period is referred to as the establishment phase  Vegetation Removal – Remove existing of restoration. weeds and undesired vegetation from the site to prevent aggressive weedy species After establishment, often after year five for from out-competing native meadow plants. conservation meadow, the long-term management phase begins. Management actions are typically less frequent and intensive than during the establishment phase, but are

3 Refer to restoration guide “Restoring your Mixed Native-Invasive Grassland to Utility Meadow” for more information on selective control of invasive perennial weeds. 4 For sites with moderate to dry soil moisture, refer to the restoration guide “Restoring your Degraded Grassland to Utility Prairie”. 5 Plugs are young plants sold in 4- or 6-packs. Plugs cost substantially more than seed, but they establish rapidly and can produce a resilient and visually appealing meadow more quickly than seeding, so it is often a preferred option for smaller sites.

2 critical for maintaining the health and diversity deposits; and whether management of of the meadow into the future. wetland discharge is required  Labor and equipment available for the project What will it cost? The cost estimate in this document will give you a baseline for what you can expect to The cost of the restoration will be influenced spend through the initial establishment phase by: of your restoration (i.e. through three years

after seeding). It may be tempting to cut costs  Management level required to control by reducing the number of species planted or weeds the frequency of weed control activities. Be  Species and number of species selected for aware that these investments on the front end the seed mix can actually save costs in the long run. A  Cost of seed, which fluctuates from year to healthy and diverse meadow will be more year resilient to disturbance, invasion by exotic  Hydrologic factors, such as drainage type, species, and extreme weather events such as size and depth; soil type and sediment drought.

Willow and dogwood invaded meadow near Bluestem Prairie© TNC \ Steve Chaplin

Degraded Grassland to Conservation Meadow Restoration Guidelines Site assessment treatment is also usually needed to prevent resprouting.

A successful meadow restoration is highly In most cases, tree and shrub removal can be dependent on specific characteristics of a site. carried out in a single season prior to Important considerations when planning a interseeding conservation meadow. Equipment restoration include: options include brush hogs, slashers, brush cutters and chain saws. The most efficient and  Has the site had herbicide treatments that effective methods of tree and shrub removal would prohibit seed from germinating? will depend on the species, size, density and spatial pattern of the targeted species, as well  Is there a risk of herbicide drift from as the soil moisture conditions (saturated soils neighboring cropfields? will not support heavy machinery). Degraded  Are the soils dry, moderate or wet? meadows that are invaded by trees and shrubs  How long are the soils saturated in the will often also have some invasive perennial spring? weeds, such as reed canary grass. If reed  Has the site been drained with drainage canary grass is present, carefully-timed tiles or ditches? selective herbicide treatments will be required6.  Is there a substantial buildup of sediments

on site that may require excavation? Recommended protocol:  Are there steep slopes that may be vulnerable to erosion?  Cut dense brush thickets that are unlikely to  What types of vegetation are currently be controlled by fire alone using brush present on the site? cutters or similar equipment. If you are new to meadow restoration, we  Cut trees more than 1 inch in diameter with strongly encourage enlisting someone who has chainsaws or slashers. restoration experience to help you assess the  Treat stumps with appropriate herbicide, characteristics of the site and develop a e.g. Triclopyr (Garlon 4), Picloram (Tordon), restoration plan suited to your site’s specific and glyphosate (Roundup). features and your project goals.

Vegetation removal

Woody-invaded meadows typically require a combination of mechanical removal, selective herbicide treatments, and prescribed fire to control invasive trees and shrubs and prepare the site for interseeding native meadow species. Tree seedlings and smaller saplings (diameter < ½ in.) can often be managed with controlled burns, but larger trees require Carbide cutter grinding woody plants at mechanical removal. Chemical stump Sheepberry Fen © TNC\Jared Culbertson

6 Refer to restoration guide “Restoring your Degraded Grassland to Conservation Meadow” for more information on selective control of invasive perennial weeds.

o Note: if standing water is present, an  Burn prior to seeding to remove thatch (see aquatic-approved herbicide (e.g. Rodeo) vegetation removal). must be used.

 Haul and pile woody slash using tractor- mounted skid steers or grapple Seeding attachments. The key to establishing a successful meadow is  If woody invasion is more extensive, slash to maximize seed-to-soil contact during should be piled and burned, or chipped in a planting. woodchipper and removed. o If woody cover is relatively low (<10%), Broadcast seeding with a spreader mounted to slash may be distributed and left to rot a tractor or ATV is recommended for or burn during a prescribed fire. interseeding meadows, because wet soils often cannot support heavy machinery such as seed  Burn site or mow/hay vegetation to a 4 inch drills, and many wet meadow species have very height to kill woody seedlings and remove small, light-sensitive seeds that can be buried thatch prior to seeding. too deeply by a seed drill. Broadcasting also  Invading stands of clonal species, such as allows access into difficult site conditions, such aspen, may be controlled more gradually by as rocky or uneven soils, while drilling into an girdling. untilled site can disturb the soil conditions and be hard on the drill. However, if the seedbed is  Cropping and disking are not recommended dry and firm, grasses may be seeded with a no- for woody-invaded meadows. till drill, followed by broadcasting forbs (flowering plants) and sedges. The use of no- till drills on remnant meadows should be limited to large, low-diversity sites with few Seedbed preparations remaining native species. Minimal seedbed preparation is recommended when interseeding into existing vegetation. This helps avoid disturbing the native species on site and bringing additional weed seeds and rhizomes to the soil surface. If invasive species are minimal and the site is dominated by a few highly competitive native species, selective disking or tilling (for example, in patches or strips covering 25-50% of the site) is sometimes used to reduce competition from existing natives and create openings for seedling establishment. However, if a diversity Broadcast seeder with light drag © DNR\Cory Netland of native species is present, we recommend avoiding soil disturbance and instead Seeding meadow remnants should be broadcasting seed into newly burned ground undertaken with caution to avoid negatively after a fall burn. Native remnants (unplowed impacting remnant vegetation, soil meadow) should never be tilled or disked. communities and wildlife. Seed mixes should be tailored specifically to the site to avoid Recommended protocol: introducing aggressive species that may outcompete existing vegetation. In general,  Forgo site preparation to minimize soil species already present on site should not be planted unless the seed is harvested on site. disturbance and subsequent reinvasion. Dormant seeding or ash seeding may help incorporate seeds into soil.

Native seed mixes should be planted with equipment designed to handle different-sized seeds ©Justin Meissen

Whenever possible, locally-harvested seed fence or packer pulled behind the should be used, and species selection should be tractor/ATV while broadcasting. based on historical records and/or reference . Note: If dormant seeding (late fall sites. If purchasing pre-designed seed mixes, through early spring) or ash seeding consider the following modifications: (sowing into ash immediately following a burn), mechanical  Species already present on the site, or not incorporation may not be needed. appropriate for the site, should be Freeze-thaw, snowmelt and rainfall eliminated from the mix. action may naturally incorporate  Relative rates of conservative to common seeds into the soil. species will be increased. o Alternative seeding method: If seedbed  Locally-harvested seeds will be prioritized is dry and firm, drill grass seeds directly over commercially-produced seed. into existing vegetation using a no-till drill such as a Truax. Additional If broadcasting seed, native-seed broadcasters mechanical incorporation or packing is such as a Vicon seeder should be used. They not required when using a no-till drill. are designed to spread mixes with different Broadcast forb and sedge seed. sized seeds. If planting with a drill, use a seed o For areas that are too wet for a tractor drill designed specifically to plant prairie or ATV, a second alternative seeding grasses and flowers. In some cases, the wettest areas may need to be hand-seeded or method is to broadcast seed by hand. planted with plugs.  When to seed:

o Planting dates will vary depending on Recommended protocol: the weather and location within the  How to seed: state. Consult with native seed suppliers o Broadcast seeds into existing vegetation or restoration specialists to determine using an agitating spreader such as a the best planting dates for the year. Viton seeder mounted to a tractor or o Dormant seeding is recommended for ATV, following a fall burn or mow to meadows, because the ground is more remove thatch. Or plant by hand if likely to be dry and firm in the late fall selectively seeding small patches. o Incorporate the seeds into the soil with a light drag, such as a piece of chain link

and early winter7. Dormant seeding and ensure year-round habitat should occur Dec. 1 to April 1 OR after resources and visual interest9. soil temperatures fall below 50 degrees o Cover/nurse crops are not F for a consistent period of time. recommended for interseeding. Dormant seeding before the ground is frozen, sometimes called “frost  Design: seeding”, can be done with a seed drill o Apply seed mixes to “seeding zones” on or by broadcasting. When possible, site based on soil moisture conditions timing the seeding before a snowfall and hydrology; for example: seed a wet may help prevent seed loss to birds and prairie mix into areas that are saturated wildlife. After the ground is frozen in 3-4 weeks annually, and a sedge winter/early spring, seed can also be meadow mix into areas that are broadcast over snow, although results saturated 6-8 weeks annually. of snow seeding are more variable and o Wet prairie and sedge meadow mixes dependent on weather conditions. can be combined and seeded across the Dormant seeding promotes cool season entire site if seed zones are closely grasses, sedges and flowering plants. intermixed and seeding individual zones Spring and growing season plantings is not feasible. (April 1 – July 1) are not typically o If there are dry to moderately moist soils recommended for wet meadows on the site, select a separate because the soils are often too conservation prairie seed mix for these saturated to support equipment, spring seeding zones10. flooding may wash seeds away, and  Seed rate: overwintering is necessary to trigger o Plant at a minimum of 160 seeds/sq. germination in many wetland sedges foot to reduce risk of weed invasion. and flowering plants. However, when o Seeding rates may need to be increased conditions allow, growing season by 25% for dormant seedings to account seeding can yield satisfactory results, for lower germination rates and loss of particularly for wetland grasses8. seed to wildlife.

 Seed mixes will vary but should take into

account: o Consider soil moisture conditions of the Hydrologic restoration site. o Include species that provide habitat Nearly all wet meadow sites in western Minnesota have been impacted by altered value for wildlife and insects, including hydrology. Restoring hydrology by removing mixed-height grasses and sedges and a drainage features is a critical component of wet diversity of flowering plants. meadow restoration. When planning a o Select a mix of both warm- and cool- meadow restoration, take note of the following season species and species that bloom recommendations and refer to the Minnesota in spring, summer, and early fall to Wetland Restoration Guide (BWSR) or encourage resilience to disturbances Restoring Prairie Wetlands: an ecological approach (Galatowitsch and van der Valk 1994)

7 Early fall seeding is not recommended for meadows, because seed may germinate too early and not survive over winter. 8 Summer seeding after July 1 leads to poor seedling survival and is not recommended for wet meadows. 9 See nature.org/MNPrairieRestorationGuides for more information on seed mix design and examples of conservation meadow seed mixes for different regions and soil moisture. 10 See nature.org/MNPrairieRestorationGuides for examples of conservation prairie seed mixes appropriate for dry to moderately moist soils. 7 for additional information. For further guidance Post-seeding aftercare and on evaluating and implementing the engineering aspects of hydrologic restoration, long-term management consult with experienced restoration professionals or local Soil and Water Interseeded conservation meadow Conservation District representatives establishment generally takes 5 to 7 years. (www.maswcd.org). However, this will vary depending on soil moisture and climate conditions. Early management (aftercare) is critical to prevent re-invading woody species and invasive weeds like reed canary grass from out-competing and displacing establishing native meadow species.

Maintaining control of reinvading trees and shrubs and other weeds is the primary management concern in interseeded prairie restorations. However, when necessary, existing native vegetation should also be carefully managed to promote rapid establishment of planted natives. However, saturated conditions may limit management Breaking drainage tiles with a backhoe© MN BWSR options, preventing access by heavy equipment.

Recommended protocol: Post-seeding aftercare goals include  Use a backhoe to break drainage tiles discouraging weeds and encouraging rapid and robust establishment of native species. The and/or plug drainage ditches. restoration site should be divided into  Break tile in strategic locations, for example: management units for burning on a rotational at the wetland’s outlet (it is usually not basis to maintain diversity and wildlife refuges. necessary to remove the entire length of Management strategies during the tile). establishment phase include:  Hydrologic restoration should be implemented after vegetation removal.  Selective mowing or haying to reduce After the site is flooded, access will be competition limited and herbicide options are restricted  Selective mechanical or chemical control of to aquatic-approved formulas such as resprouting woody species Rodeo.  Selective use of appropriately-timed  Time hydrologic restoration to occur in the aquatic-approved herbicide to control reed fall or early winter in close conjunction with canary grass and other invasive perennials seeding, preferably 1-2 weeks following  Prescribed fire to promote native meadow seeding (after flooding, site access will be species and discourage further invasion, limited). particularly in wet prairie zones  Reserve a small amount of seed to hand-  Monitoring vegetation to evaluate broadcast over areas disturbed by backhoe establishment of meadow seedlings and operations.  If transplanting live plant material or plugs, this can be done in the late spring following hydrologic restoration.

detect invasive species problems. This is glyphosate such as Rodeo in September particularly important in wet sites, because using methods that will minimize damage to site conditions may prevent management in native seedlings. For example, use a some years. backpack sprayer or wick applicator, and avoid windy days to minimize herbicide Throughout the establishment phase and drift. beyond, adjust management plans as necessary, including the option to reseed, to achieve the desired species composition and Year 2: diversity.  Spot-control resprouting woody species as necessary. Recommended management protocol:  Scout for invading reed canary grass. If

Year 1: detected, spot-treat with aquatic-approved glyphosate in September using methods  If necessary, spot-mow to reduce native that will minimize damage to native competition when site is dry and firm, meadow species. typically early to mid-summer. Selectively

mow to a height of 4-6 inches to reduce Years 3-5: competition from established natives and minimize thatch build-up. Most newly  Begin prescribed burns after three growing planted prairie plants will not reach this seasons, or as soon as biomass height in first year and will not be damaged accumulation is sufficient to carry a burn. by a mower.  Rotate burns in management units, burning o If reed canary grass is present, avoid no more than one third of site (one half for mowing reed canary grass except to small sites) at a time to maintain diversity prevent going to seed. Mowing may and a local refuge for wildlife. Burn at an reduce effectiveness of herbicide and interval of every 4-7 years. stimulate seed germination.  Spot-treat reed canary grass (in September) o Note: if mowing is not possible, and other weeds as necessary with aquatic- establishment of planted seedlings may approved herbicide. be slower.  Conduct a stand evaluation to assess  If resprouting woody trees and brush are seedling establishment outcomes. If native too dense to control via mowing, spot- plant density is less than 1 plant per square control with brush cutters or cut-stump foot, interseed to increase cover and treatments. diversity.  Scout for invading reed canary grass. If detected, spot-treat with aquatic-approved

Year 6 & beyond (long-term management  Every 1 to 3 years, monitor vegetation phase): composition and diversity.  Burn every 4-7 years to stimulate o Interseed as needed to increase native productivity of native meadow plants cover and diversity if native species are (particularly in the wet prairie zone) and declining. prevent invasion of perennial weeds and o Adjust management plan, such as woody trees and shrubs. frequency and intensity of burning or o Note: burning more frequently may grazing, if: negatively impact sedges. . cover of native species is declining  Continue to burn in rotations, disturbing no . desired composition is not being more than one third of a field at a given maintained time, to maintain diversity and a local . cover of invasive species is refuge for wildlife. increasing  Adjust seasonality of burning to maximize o Spot-treat reed canary grass and other diversity. For example, alternate between weeds as needed by hand-pulling, back- spring and fall burns on individual pack sprayer, wick-applicator or management units, as site conditions allow. dormant-season application. Note that  If conservation grazing is used, graze in reed canary grass may continue to rotations at low to moderate intensities, or emerge from the seed bank for 10 years! at stocking rates prescribed by a grazing o Temporarily increase burn frequency if management plan written to meet the woody invasions increase in cover. objectives of the conservation prairie. Note that sustained burn intervals of Avoid grazing in saturated conditions. less than 3 years will negatively impact cool-season natives and wildlife.

Cost estimate Minnesota Noxious Weeds – MN Dept. of Transportation The estimated cost to restore a degraded www.dot.state.mn.us/roadsides/vegetation/p meadow that is invaded by woody species to df/noxiousweeds.pdf conservation meadow in Minnesota is $2,437 per acre plus a $700 flat rate, for a minimum Minnesota Wetland Restoration Guide – MN total of $3,137, based on 2013 prices. Costs Board of Water & Soil Resources associated with site assessment and project www.bwsr.state.mn.us/restoration planning are excluded from this estimate. Native Vegetation / Seed Mixes – MN Board of This cost estimate assumes vegetation removal Water & Soil Resources includes cutting trees and shrubs, piling and www.bwsr.state.mn.us/native_vegetation burning the slash, and two controlled burns (burning no more than one half of the site per Planting and Maintenance Recommendations season). This cost estimate also assumes the for Wetland Restoration and Buffer Projects – site is broadcast seeded and cultipacked. The MN Board of Water and Soil Resources. $700 flat rate is a low-end estimate of www.bwsr.state.mn.us/native_vegetation/pla hydrologic restoration (e.g. tile removal) that nting-maintenence-recs.pdf assumes a modest mobilization fee and includes the costs to excavate, remove tile, seal Prairie Management: Woody Species Control the ends, and backfill and compact the trench. [Video] – Tallgrass Prairie Center www.youtube.com/watch?v=Tk__46D46Dg Post-seeding management costs include aftercare activities through year 3, specifically: Prairie Seedling and Seeding Evaluation. selectively mowing six times, spot-spraying re- Bockenstedt, P. 2006. Bonestroo Rosene invading woody resprouts and/or perennial Anderlik & Associates. weeds two times, and conducting three prescribed burns (burning no more than one Restoring Prairie Wetlands: An Ecological third of the site per season. Long-term Approach. Galatowitsch, S. M. and A. G. van der management costs are not included in this cost Valk. 1994. Iowa State University Press. estimate but can be quite variable depending on site needs. Costs assume services and seed The Tallgrass Prairie Center Guide to Prairie are purchased from restoration contractors and Restoration in the Upper Midwest. Smith, D. native seed nurseries. 2010. University of Iowa Press, Iowa City, IA.

The Tallgrass Restoration Handbook for Useful references Prairies, Savannas, and Woodlands. S. Packard and C. F. Mutel, editors. 2007. Island Press, Going Native: A prairie restoration handbook Washington, D.C. for MN Landowners – MN Dept. of Natural Resources http://files.dnr.state.mn.us/assistance/backya rd/prairierestoration/goingnative.pdf

Guidelines for inter-seeding to restore or enhance native species diversity – Minnesota Board of Water and Soil Resources www.bwsr.state.mn.us/native_vegetation/inte r-seeding.pdf

Invasive Plant Species Management & Identification – MN Dept. of Natural Resources Restored conservation meadows attract www.dnr.state.mn.us/invasives/terrestrialplan many pollinators © Raymond Auger ts