are coreopsis hardy in uk?
Coreopsis may be started from seed or you may purchase nursery-grown plants. ... HARDINESS: Both of the native species, Coreopsis grandiflora and Coreopsis verticillata, are winter hardy in growing zones 4-9. Some cultivars are also hardy in zones 4-9 include 'Zagreg', 'Moonbeam', 'Sun Up' and 'Presto.