Galanthus 'Yvonne Hay'
6th January 2017
References:
Bishop, M., A.Davis and J.Grimshaw. Snowdrops, A monograph on cultivated Galanthus. Griffin Press Publishing ltd. 2001 (reprinted 2006).
Davis, A.P. The Genus Galanthus.The Royal Botanic Gardens Kew/Timber Press.1999
Stern, F.C. Snowdrops and Snowflakes. The Royal Horticultural Society.1956.