Wildflowers moving north as climate changes, citizen survey of plants finds
Wildflowers and rare orchids like the Bee orchid are moving further north in the UK as as temperatures rise, a citizens survey found. The discovery has prompted calls to manage landscapes to make space for a wider variety of plants in the face of climate change. Results from the first five years of the government-funded National Plant Monitoring Scheme already shows the impact of a warming world on the UK's plants. Southern marsh-orchids, a tall plant found in damp grasslands, was once restricted to southern UK but records have come in from as far north as Newcastle upon Tyne. The survey uses data from 15,000 surveys by volunteer citizen scientists and already shows wild orchids expanding their range to areas they have never been in before. The National Plant Monitoring Scheme looks at 30 different habitats, from woodland and hedgerows to blanket bogs and streams, with around 30 wild flowers to search for in each type of place. Data is collected by volunteers, co-ordinated by wildlife charity Plantlife and analysed by botanists from a range of organisations . Bee orchids were not previously found in Scotland, but volunteers have discovered the plants, whose flowers resemble a bee's backside, at several sites around Glasgow and Edinburgh, according to Plantlife. Other specialist plants are moving outside their usual range, including mossy stonecrop, a succulent once only found in the New Forest and East Anglia. This has also started to spread to sandy habitats in Scotland. Early meadow-grass was formerly only found on the Lizard Peninsula in the extreme South West of England but has now been recorded in Fishguard, south-west Wales. In fact it has spread even further, volunteers spotted the grass in Rosslare in Ireland, and central London. While southern plants are finding new habitats in cooling northern climates, there is a concern for northern plants that have nowhere else to go, said Plantlife. This includes Arctic and alpine species which cannot go further up the mountains, such as Highland saxifrage. The increased risk of drought due to climate change puts many smaller, short-lived species at risk, with fairy flax, yellow-wort, soft brome and common mouse-ear suffering from heat and lack of water in 2018's drought. However, while some species will die out due to a lack of water, the results from the monitoring scheme also show a rise in species able to cope with drought. These include salad burnet, a dark crimson flower found in old hay meadows, which has a longer root so it can reach down to moist soil, and wild thyme, which managed water loss with its tiny leaves. The analysis also reveals the impact of nitrogen pollution, with nitrogen-hungry stinging nettles the most frequently recorded native species in woodlands. Dr Trevor Dines, Plantlife's botanical specialist, said experts had previously thought that it would 'take an awful lot' for plants to start moving northwards. He said this is because the dispersal of plants is very slow. 'To actually start seeing that now, coming through so strongly, is a real wake-up call,' he said, adding, 'it proves to us that climate change is having a real impact.' 'Our concern is that we live in such a fragmented landscape, there aren't the places for these plants to go,' he said. Growing chances of drought, particularly in the crucial spring months of April, May and June, is even more of a risk than general warmer conditions, Dines warned. 'Any climate change that involves drought scenarios is going to affect plant populations much more quickly.' He said tackling climate change is about making the landscape as permeable as possible so things can move around. This can be done by creating habitat where flowers can bloom and setting as much seed as possible through grazing animals and hay cutting at the right time of year. Road verges, which are corridors through the landscape, should not be subject to repeated mowing, while moving livestock, machinery and distributing wildflower-rich hay can all move seed around the landscape, he said. While rewilding can play a part on a small scale, Dr Dines said agri-environment schemes could be used to get habitat management in place to suit wildflowers on as wide a scale as possible.