Seeds can be sown at any time, but for a full season of growth are best sown in trays in early spring. Cover 'seeds' thinly in a cool spot, artificial heat is rarely needed as this can cause rapid germination and fungal attack. Seedlings usually appear within 3 to 6 weeks but can take much longer. Pot on into small pots and protect from hot sun. Plant out into a shaded, moist, peaty or organic soil. Many are herbaceous, dying down to a large, resting, winter bud.