GNO Gardening Magazine February 2020 In This Issue: Super Plant Spotlight ‘Diamonds Blue’ Delphinium and ‘Camelot’ Foxgloves Revisited By: Anna Timmerman Diatomaceous Earth and Kaolin Clay By: Dr. Joe Willis Landscape Bed Preparation By: Dr. Jeb Fields Gulf Coast Monarchs Plant Milkweed Now! By: Ginna Hoff Growing a Seed Library By: Jennifer Prout What’s Bugging You? Asian Citrus Psyllid By: Dr. Joe Willis February Planting Guide Farmer’s Markets in the GNO Area In the Kitchen with Austin Upcoming Events February Garden Checklist Lawn Do’s & Don’t’s Cover Photo: ‘Diamonds Blue’ Delphinium Super Plant Spotlight – ‘Diamonds Blue’ Delphinium and ‘Camelot’ Foxglove Revisited he tail end of the cool season is upon us, and can perennialize in more northern climates, but in T this month’s two LSU AgCenter Super Plants our area, they should be treated as a beautiful annual. are hitting the shelves of your local retail nursery now It’s just too darn hot and humid for their taste here in and often already bedecked the Gulf South, though with blooms or buds! Add a ‘Diamonds Blue’ has some splash of spring color to your reported tolerance of these landscape with these two conditions. As soon as the showstoppers. I enjoy temperatures rise, they tend planting both of these Super to burn out. Mulch around Plants together as they have delphiniums to keep weeds very similar forms and down and soil moisture growth habits. consistent. The flower Both ‘Diamonds Blue’ blooms will last around six delphinium and ‘Camelot’ weeks. You may need to foxgloves can be planted in stake the flower spikes to the fall months in the GNO keep them upright since the area, beginning in October. blooms are profuse. Plant At that time, however at that delphiniums a foot apart in time, they are not yet landscape beds, or mass showing their true colors and them in groups of three to are just mounds of maximize their impact. Use a inconspicuous green and are two-gallon pot or larger if easily overlooked by many planting as a container gardeners when shopping. display. Be sure that the Check out the article on container drains well and ‘Camelot’ Foxgloves ‘Camelot’ foxglove in the don’t let the soil dry out September 2019 issue of GNO Gardening. They are at completely . Before planting, add a little slow release the garden centers now and should not be all purpose fertilizer to the soil. ‘Diamonds Blue’ overlooked! February is the last recommended delphiniums are easy to grow and really electrify a month to plant both of these cool season flowers in garden in the springtime. our area. As we have mentioned, the ‘Camelot’ series of ‘Diamonds Blue’ delphinium Delphinium chinensis foxgloves Digitalis purpurea provide a wonderful offers a pop of electric blue color unmatched by any cottage garden vibe in spring gardens. These other true-blue flower out there. They make lovely foxgloves offer gardeners a palate of light tinted accent plants within a larger bed of cool season spring colors, including rose, lavender, cream, white, flowers or function as a stunning focal point in a apricot, and pink. They have a classic speckling on the container. Delphiniums appreciate full to partial sun lip of each flower, which work to guide bees and other and well-draining, yet moist soil conditions. Don’t pollinators towards nectar and pollen within. expect them to bloom (or live) forever. Delphiniums ‘Camelot’ flowers tend to be positioned more horizontally, rather than bell-like, meaning that their February Vegetable Planting Guide Crop Recommended Variety Beets Detroit Dark Red, Kestrel, Red Ace F1, Ruby Queen Carrots Danvers 128, Purple Haze, Thumbelina, Apache, Enterprise, Maverick, Sugar Snax 54 Collards Champions, Flash, Georgia Southern, Top Bunch, Vates Eggplants (seeds) Dusky, Epic, Night Shadow, Black Beauty Irish Potatoes Dark Red Norland, Red LaSoda, Kennebec, Yukon Gold, Kale Siberian, Vates Kohlrabi Early Purple Vienna, Early White, Vienna, Winner Lettuce Esmeralda, New Red Fire F1, Nevada, Tall Guzmaine Elite Mustard Greens Florida Broadleaf, Greenwave, Red Giant, Southern Giant Curled, Savannah, Tendergreen Pepper, Bell (Seeds) Aristotle XR3, Jupiter, King Arthur, Paladin, Golden Summer, Purple Beauty, Tequila Pepper, Hot (Seeds) Grande, Tula, Mariachi, Mitla, El Rey F1, Tobasco, Jalapeño M, Super Cayenne II Radishes Cherriette, Champion, White Icicle, April Cross Shallots Matador, Prism Snap Beans, Bush Blue Lake 274, Bronco, Contender, Festina, Lynx, Provider, Roma II Snap Beans, Pole Derby, Blue Lake, Kentucky Blue, McCaslin, Rattlesnake, Kentucky Wonder 191 Spinach Bloomsdale Long Standing, Melody, Tyee, Unipak 151 Sweet Corn Merit, Silver Queen, Honey ‘n Pearl, Ambrosia Swiss Chard None Given Tomatoes (seeds) Bella Rosa, Fletcher, Tribute, BHN 1021, Amelia, Dixie Red Turnip Greens Alamo, All Top, Purple, Top White Globe, Seven Top, Southern Green, Top Star, Tokyo Cross Super Plant Spotlight – ‘Diamonds Blue’ Delphinium and ‘Camelot’ Foxglove Revisited spotted throats are more visible when compared to flower spikes early in the morning after the dew has older foxglove varieties. Foxgloves may also be dried from them. Harvest both foxgloves and planted in our area beginning in November, with delphiniums when 1/3-1/2 of the flowers are open so February being the last recommended month to get that you may enjoy them indoors longer. Use a sharp them into the garden. They enjoy full or partial sun, knife to cut them rather than scissors or hand with moist, yet well- pruners. The pinching draining soil. As with action of scissors or delphiniums, foxgloves hand pruners crushes are treated as cool the stem ends, inhibiting season annuals in the the uptake of water into Gulf South because they the blooms. Recut stem burn out in the heat and ends at an angle daily to humidity. ‘Camelot’ is keep them fresh and bred to be more tolerant perky longer. Change of our climate, but they water in the vase daily are still unable to make and keep them out of it through the brutal direct sunlight. summer months. Give both of these truly Foxgloves typically begin outstanding Louisiana to bloom in early spring Super Plants a try this and may continue to do spring, you won’t be so through the end of disappointed. Both May. Mass foxgloves for delphiniums and a stunning effect in a foxgloves lend a cottage ‘Diamonds Blue’ delphinium cut flowers landscape bed. They feel and a welcome pop may also be used as a specimen plant in a container of color to our gardens during the transition from the and require the same soil and moisture conditions cool season to the summer months. Both are easily that delphiniums do. Mulch helps to keep weeds found at local garden centers in the springtime, be down and soil moisture consistent. Use a little slow sure to choose plants with buds rather than fully open release fertilizer to the soil to keep them blooming. blooms. This will extend their display time and Staking may be needed to keep flower spikes upright ensure that you may enjoy their charm for many also. weeks or even months. Both ‘Diamonds Blue’ delphiniums and ‘Camelot’ ~Anna Timmerman foxgloves are toxic. Be sure to plant them out of reach For more information on ‘Diamonds Blue’ delphinium or of small children or pets to be safe. Use a garden ‘Camelot’ foxglove, as well as all of the LSU AgCenter fence or position containers out of reach to manage Super Plants, please visit. www.lsuagcenter.com/ this risk. superplants. Each year, the LSU AgCenter releases several new Super Plants, which are “university tested, industry Both of these Super Plants make wonderful cut approved”. Super Plants grow throughout the state and flowers and last in a vase for up to a week easily. Cut have been proven to succeed in our area. Be sure to ask for Louisiana Super Plants at your local garden center. Diatomaceous Earth & Kaolin Clay n this series, we’ve discussed horticultural oils, The first pesticide products containing silicon dioxide I neem and insecticidal soaps. Many of you have (diatomaceous earth) were registered in 1960 to kill used these “soft” pesticides and are familiar with insects and mites. them. Generally, these have a mostly physical effect Products containing diatomaceous earth are most on the pests they are controlling (see GNO Gardening commonly dusts but other formulations include November 2019 wettable powders and December and pressurized 2019 and January liquids. 2020). This Currently, there month we will are over 150 DE discuss a couple insecticide of insecticides products that may be a registered for use little less familiar: inside and diatomaceous outside of earth (DE) and buildings, farms, kaolin clay gardens, and pet (Surround®). kennels. Photo by Wilson Gitari Both are effective There are also control measures Electromagnetic microscopy image of a sample of diatomaceous earth. thousands of non because of their -pesticide products that contain diatomaceous earth. physical attributes and the physical effect they have These include skin care products, toothpastes, foods, on pests. beverages, medicines, paints and water filters. The Diatomaceous Earth Food & Drug Administration lists diatomaceous earth Diatomaceous earth is made from the fossilized as "Generally Recognized as Safe". "Food grade" remains of diatoms, tiny organisms that lived in diatomaceous earth products are purified and may be rivers, streams, lakes and oceans. Diatom skeletons used as anticaking materials in feed, or as clarifiers for are made up of silica (silicon dioxide), a combination wine and beer. of silicon and oxygen. Silica is common in nature and Diatomaceous earth is not a poison; it does not have makes up 26% of the earth's crust by weight. Over a to be eaten in order to be effective. Diatomaceous long period of time, diatoms accumulated in the earth causes insects to dry out and die by absorbing sediment of rivers, streams, lakes, and oceans.