There are three main challenges these plants have to overcome: salinity, wind and drought. There are only so many plants that can grow in these conditions. Helena said that 85% of the British plants could not do so. A good number of the plants that can, are very rare, for instance the Goldilocks Aster is now found in only six UK sites, in the SW of England and Wales.
Photo: Aster linosyris (Goldilocks Aster)