Ageratum Seeds houstonianum Blue Mink Ref: TM01401331 SowingSow late winter to mid spring at 15C (60F) in a good seed compost. Sow seed on surface of compost and gently firm down compost. Keep soil damp but not wet. Do not exclude light. Germination usually takes 10-15 days.GrowingWhen seedlings are large enough to handle, transplant and grow in cooler conditions. Gradually acclimatise to outdoor conditions for 10-15 days before planting out after all risk of frost, 15-30cm (6-12in) apart in a sunny spot in good garden soil.Aftercare Remove faded flower heads regularly to prolong the period of blooming.FloweringSummer. Remove spent blooms.croppingPlant typeHalf-hardy Annual Price: £1.49 Quantity: