Posted: 16/10/2013 at 17:43
AJK, that aquilegia will germinate more reliably if you sow it in a cold GH or outside in the winter. I sowed all mine on new year's day this year, Very successful. A lot of hardy perennials need a chill before they germinate. Most Ranunculacaea and Apiaceae in particular.
If you want to try some more cold ones astrantias are easy sowed cold now.
No hardy perennial NEEDS heat. There are some that will germinate quicker with heat but to balance that there are some that will never germinate if they have heat.
If you want seeds that will be what you started off with you need species, not F1s or those with their names in inverted commas. For those you need to divide or take cuttings.
http://theseedsite.co.uk/ There's some useful info on here.