Sow indoors all year round. Cress is good fun and so easy to grow. It can be sown on and in a large range of things. It can be sown in compost, on moist kitchen roll or cotton wool or any other open structured material that will absorb water, placed in pretty much any type of container at any time of year. Sow generously, water well and place in warm, light position, away from cold draughts and out of intense, direct sunlight. Keep the growing medium moist at all times. Seedlings should start to appear within a few days. No thinning is necessary. Sow more seed every 2 weeks for a continuous supply.