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Globeflower Trollius Europaeus

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Globeflower Trollius Europaeus Globeflower Trollius europaeus A distinctive member of the buttercup family, growing up to 70 cm. The dark green leaves are palmate-lobed resembling a hand, and each lobe is deeply-toothed. The 5-15 large, bright yellow, petal-like sepals form a globe 2.5-5 cm in diameter. They remain closed and surround strap-shaped nectar-secreting petals and many yellow stamens. Like other members of the buttercup family, globeflower contains a bitter tasting poison ‘protonaemonin’ which produces blisters. Lifecycle Globeflower is an early-flowering perennial, blooming between March – May. Occasionally it may flower into August depending on local conditions and latitude. To reproduce, it relies on pollen being transferred between flowers by chiastocheta flies (which only feed on globeflower), micromoths and bumblebees that are able to force their way through the petals. After flowering, a dense cluster of fairly heavy, black, wrinkled seeds are produced, which are likely to be clustered around the parent plant. The seeds do not live long in the soil (most perish within 16 Globeflower distribution across Britain and Ireland months) and can be transported to new The data used to create locations on or in livestock. During winter the these maps has been provided under licence stems dieback but the distinctive leaves are from the Botanical Society easy to find. of Britain and Ireland (BSBI) and accessed from the Society’s online distribution database. Habitat GB Status and rarity Globeflower grows in wet meadows, upland The Vascular Plant Red Data List for Great hay meadows, rhôs pasture in Wales, fens, Britain 2005 classifies Globeflower as ‘Least wet woodlands and along waterways. It can Concern’ meaning that it is not considered to grow in sunlit or partially-shaded locations be threatened. However, the status within and is often found in alkaline or neutral soils. each country differs. It is classified as ‘Least In Ireland, globeflower is only found in one Concern’ in The Vascular Plant Red List for habitat – the narrow 2-3 metre strip around England (2014) with a specific note on the the winter high watermark on rocky lake fact that it has suffered a 36% decline. In shores under alder, willow and rose scrub. In Northern Ireland, Globeflower is a Priority Scotland it is often found in species-rich Species and classified as ‘Vulnerable’ in the lowland meadows. Irish Red Data Book (1988). It has no status as a priority species in Scotland or in the Distribution Vascular Plant Red List for Wales (2008). The distribution of globeflower is towards the north of Great Britain. It is present at the southern end of its range in Wales and becomes more common in northern England. Larger populations are found in Scotland. In Northern Ireland it is restricted to Fermanagh, where it is the county flower. Reasons for decline o Fertiliser application -fertilisers encourage the growth of more Globeflower is in decline, particularly at the vigorous grasses, against which outer edges of its range. The reasons for this globeflower cannot compete. include: o Changing management of upland hay Grazing pressure: meadows - grazing into May when globeflower starts to flower results in o Over-grazing – globeflower is eaten by flowering stems being grazed off. sheep and goats and as a consequence is Cutting hay too early also removes restricted to inaccessible or ungrazed flower heads before seeds have set. areas. It is also not very tolerant to trampling by livestock and heavy grazing Invasive species particularly where livestock have access to water margins, fen, wet grassland, o Competition from scrub and other damp hay meadows and woodland edge invasive species encroachment. habitats. Extreme events o Under-grazing - livestock act as the transporter for seed and without a o Flash flooding - the favoured certain level of grazing, particularly by streamside habitat of globeflower cattle, the heavy seeds fall close to the means that it can be at risk from parent plant and it is unable to spread. flash flooding washing away clumps Cattle create patches of bare ground of plants. that create a good environment for seed germination, and grazing also Reproduction prevents vegetation becoming too rank and shading globeflower plants. o Reduced pollination – there is thought to be a decline of o Slug grazing – grazing of seedlings and chiastocheta flies and other new leaves early in the season may have pollinators resulting in reduced seed a significant impact on globeflower production. affecting the establishment of new populations. Climate change Agricultural practices o Globeflower may be susceptible to changing global climate. It is a plant of o Drainage - draining of land has reduced cooler temperate regions, and the the amount of streamside habitat. warming of the UK climate may limit or change the habitat for this plant. o Silage production -the loss of traditionally managed upland hay Protection under the law meadows to silage production has reduced the area of suitable habitat for Globeflower is not protected under law in globeflower. Cutting earlier for silage England or Scotland. In Wales it is included as rather than hay severs flowering stems a species “of principal importance for the before they have been able to set seed. purpose of conserving biodiversity” under Many fields have been re-seeded with Section 42 (Wales) of the Natural Environment grass and clover leys, completely and Rural Communities Act 2006, and in removing globeflower plants, and Northern Ireland it is listed for special restricting their return as globeflower protection under Schedule 8 of the Wildlife cannot compete for nutrients and light (Northern Ireland) Order 1985. with the more vigorous grasses. Habitat management for globeflower The first course of action is to manage existing populations of globeflower in a suitable manner. If the land is under pasture management then grazing pressure should be at a level that will not trample plants and livestock should be let into the pasture just as plants set seed to aid dispersal. If the land is managed for hay then any spring grazing livestock should be removed early enough to enable the flowering stems to develop and bloom. Hay cutting should be delayed until after the seeds have set in summer and light aftermath grazing, particularly with cattle, should be undertaken in the vicinity of plants, to remove more rank vegetation and reduce competition. Globeflower can be spread by managing suitable adjacent land. Encouraging populations to spread will create a localised mosaic of metapopulations, which will help the species to become more robust and less susceptible to extreme events that could wipe out entire populations, such as flash flooding, or the longer term affects of climate change. In areas where globeflower populations have declined or been lost then reintroduction could be considered. Before placing new plants it is important to know why population loss or decline has occurred. If the negative factors reducing globeflower are still present, Survey method then it is unlikely that the introduced plants will survive. Consideration should be given Globeflower is a clump-forming plant and the towards how the land will be managed after number and size of clumps and changes in the reintroduction to make sure that the new their distribution should be monitored. If a populations have the best opportunity for greater level of survey is required for long-term survival. The affects of climate individual populations, the number of buds, change should also be considered and if this is flowers and seed heads could be counted to the cause of the decline, a reintroduction provide a record of change over time, making attempt may be unsuccessful in the long-term sure that the method of counting is the same and it would be better to concentrate efforts year-on-year, and the time of the count is at locations where conditions are more viable. similar to achieve a reasonable comparison (taking into consideration annual weather fluctuations that may delay or accelerate flowering and seed production). Growing globeflower for reintroduction Check for germination regularly from three weeks after sowing, and There are two schools of thought about transplant any seedlings as soon as propagating globeflower. The first is that they are large enough to handle seeds will readily germinate and the other is (usually when they have their first true that it is a cold germinator and seeds should leaves). either be left to go through the seasons naturally to trigger germination or can be In late autumn, place the containers hastened by ‘stratifying’ (imitating the (both the seed tray with any un- seasons by placing the seeds in a cold area germinated seeds and pots with and then bringing them out into the warmth transplanted seedlings) in a cold frame to imitate spring). or a shady area of the garden and cover with glass or clear plastic over It is important to choose suitable location for the winter. reintroduction before plants are grown. The soil pH, structure and moisture content need Seeds will continue to germinate into to be fitting for the plants to survive, and the spring. sites with lower exposure to wind are likely to be more sustainable in the long term than exposed sites, where globeflower is pollinated by flies. In addition, globeflower occurs as part of a suite of wildflowers, shrubs and trees, and is rarely found in isolation. For example, a globeflower site in Wales is very close to willow trees that flower and attract insects at the same time as globeflower. The soil used to grow the globeflowers should be similar to that at the reintroduction site. They prefer neutral-alkaline moisture retentive, fertile and humus rich soil. Using some of the site’s soil for seed germination and seedling growth will help plants condition to the soil biota.
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