The Times reports five species of wildflower native to Britain are officially classed as injurious under the 1959 Weeds Act, meaning that they are considered able to cause harm and landowners can be ordered to control their spread. However, a study has found that three of the weeds — ragwort (Jacobaea vulgaris) and two types of thistle (Cirsium arvense and C. vulgare) — are enormously popular with bees and other insects.