Posted: 20/01/2014 at 21:10
Delphinium, Verbena (bonariensis?) rudbeckias and echinaceas can be sown in a cold GH or frame now, They do well with a bit of a chill to get them started. They don't need heat. Sow them in pots and top the pots with some grit to keep the moisture in. Keep the slugs off, especially the delphiniums.
I think echinaceas might need light, ie surface sow them, but I may be wrong there.
The nigella can be sown directly into the ground in a couple of months.