Potentilla thurberi amorubens Monarch's Velvet Ref: TM01402589 SowingSow in good seed compost from late winter to mid summer, just covering the seed with compost. Sealing the container inside a polythene bag after sowing is beneficial. Germination takes 14-30 days at 18-20C (65-70F).<p>Seed sown early will often produce flowers the same season.GrowingWhen large enough to handle transplant seedlings to boxes or 7.5cm (3in) pots. When well grown gradually acclimatise to outdoor conditions and plant out 38cm (15in) apart in full sun and well drained soil.Aftercare FloweringSummercroppingPlant typeHardy Herbaceous Perennial Price: £2.99 Quantity: