English Heritage’s chosen sites include 43 castles and forts, 22 abbeys and priories and 10 historic houses.
Whitby Abbey in Yorkshire, the former home of Queen Victoria, Osborne on the Isle of Wight, and Tintagel Castle in Cornwall are examples.
A lawn has also been cleared and overseeded with wildflowers at the Jewel Tower near the Palace of Westminster in central London.
Working with conservation groups and volunteers, English Heritage will source seeds from existing meadows in the area to ensure the reintroduction of viable, local wildflower species to each site.
Plantlife, a charity dedicated to saving wild plants and fungi, has partnered with English Heritage on an initiative, offering resources and skills.
Ian Dunn, CEO of Plantlife, said the project “provides a lifeline to a hundred key grassland sites and their associated wildlife, and focuses on a lost and almost forgotten chapter of English natural history”.