Allium senescens 30 seeds To sow allium from seed, sow the black seeds about 1 cm deep in March-April in a nutritious, well-drained soil. Warmth (about 20-25°C) is needed for germination, but after emergence the plants should be kept cool (+15°C max) and bright. Plant out after hardening off when the risk of frost is over, and protect the young seeds from drought.
