I must emphasise my relative lack of experience, but having seen them at the BOGA show and following a recommendation by a member of the forum, I purchased my first Wharfedale Pine Warbler from Mr. Butterfield this autumn. I put them with the spring flowerers, but the first bud tried to grow during the very bad weather and aborted. A quick chat with Paul Cumbleton followed and he suggested that I keep it a little warmer and more humid, so I popped it in a covered tray with my Aussies in a slightly warmer greenhouse (minimum about 3-5) and hey presto second and third bulbs flowered well. Of course the first bud might have aborted due to the shock of moving but who am I to argue with Paul?
My Confirmation overwinters with my maculata and praecox in the coldest window in the house, (minimum 7-8) and is bulking up well, (a single 2010 bulb, produced two flowering bulbs each producing two shoots this year) then will spend the summer in a well shaded ventilated greenhouse. But again this is based on the experience of one bulb.
Noticing that they were not doing a lot I've also moved my Barcena and Tarawera into the greenhouse with Wharfedale. This produced instant growth and they are just flowering although sadly the slugs have made such a mess of the flowers that there's nothing worth posting on the picture front.