Potentilla atrosanguinea Seeds Ref: TM01408583 SowingSow spring to mid summer in a good free draining seed compost just covering the seed with compost. Germination can take from 14-30 days at 18-20C (65-70F). Seed sown early will often produce flowers the same season.GrowingTransplant the seedlings when large enough to handle into 7.5cm (3in) pots. Move to a cold frame or plunge the pots up to their rims in a sheltered site outdoors and plant out in autumn 38cm (15in) apart in ordinary well drained garden soil in full sun.Aftercare FloweringLate SpringcroppingPlant typeHardy Herbaceous Perennial Price: £2.49 Quantity: