Epimedium perralderianum 'Weihenstephan'
28th April 2012
A selection of the species that is reputed to have larger flowers. I have only just obtained it so it is too early to tell.
4th April 2015
15th February 2017
3rd April 2020
References:
Barker, David G. - Epimedium and other herbaceous Berberidaceae, Hardy Plant Society, 1997
Stearn, William T. - Epimedium, 2002.