Chickweed

Chickweed is an annual or overwintering native plant, and is one of the commonest weeds of cultivated land in the UK. It also occurs on roadsides, shingle riverbanks, coastal cliffs and in gardens. It is widely distributed over all soil types but is more abundant on lighter soils.

It is really enjoyed by budgerigars but unless you grow your own there is a risk of contamination and poisoning from roadside collection.