Calendula seeds officinalis Radio Extra Selected Seeds Ref: TM01401346 SowingBest sown in spring where they are to flower or late summer/early autumn for overwintering. Sow 1cm (½in) deep in rows 30cm (12in) apart in well cultivated soil which has been well raked.GrowingThin out the seedlings to 23cm (9in) apart. They will grow in sun or part shade and in the poorest of soil. For winter/early spring flowering, pot plants in a cool greenhouse or conservatory, sow in late summer/early autumn.Aftercare FloweringcroppingPlant typeHardy Annual Price: £1.99 Quantity: