I sent off for some Erysimum seeds, which have arrived with an instruction sheet giving sowing times and aftercare. I quote:- "Sow from May to July, planting the seedlings out in their final flowering positions when all danger of frost is past." Am I missing something? I always thought one planted wallflower seedlings out in September or thereabouts. Frost? in summer? Has anyone any idea as to what they mean or any possible explanation?
- 24 Nov, 2011