Calendula seeds officinalis Porcupine Seeds Ref: TM01407158 SowingSow April to May. Sow outdoors where they are to flower. Prepare the ground well and rake to a fine tilth before sowing. Sow 12mm (½in) deep, in rows 30cm (12in) apart.<p>For spring/summer flowering pot plants, sow in a cool greenhouse or conservatory in late summer/early autumn. Grow on cool in full light and water sparingly.GrowingWhen large enough to handle, thin out seedlings to 15cm (6in) apart.Aftercare Prefers a light, well drained soil in full sun.FloweringAll SummercroppingPlant typeHardy Annual Price: £1.89