Crocosmia 'Buttercup'
A vigorous modern yellow cultivar. I haven't yet been impressed by it, but this is only its second season
here and it may improve as it establishes.
19th September 2010
References:
Goldblatt,P. ,J.Manning and G.Dunlop. Crocosmia and Chasmanthe. Royal Horticultural Society Plant Collector Guide. Timber Press, 2004.