With changes in crop cycles, specialised seeds, deep ploughing and land with poor productivity being set aside, wild flowers have been driven to the edges of fields, where they struggle to survive. In the Paris area, a third of them have disappeared already and another third is threatened with extinction. The poppy is still abundant all over France, but corncockle and darnel, among others, are in a precarious situation.
Botanists started being worried in the 1960s, because the flowers are a good indication of biodiversity on farmland, and they provide food for many pollinating insects. In the long term losing these pollinators will damage farming itself, because even cereals need to be pollinated.
Via Annals of Botany: Plant Science Research