Mr Fothergills Coreopsis Unbelievable A half hardy annual flowers the same year as sown. Easy vigorous plants that grow quickly & strongly. Tall plants with masses of unbelievably coloured flowers.TS: February-April (I) April-August (O) F: June-October Sow outdoors where they are to flower 0.5cm (1/4) deep directly into finely prepared soil which has already been watered. Coreopsis Unbelievable Seedlings usually appear in 14-28 days. Thin seedlings to 30cm (1) apart. Water well until plants are established. Contains 200 seeds inside!