Barbarea verna - Landcress.
This cress variety has glossy smooth edged dark green leaves that will grow to 20cm but are best picked at around 10cm and before flowering occurs which makes them much stronger in taste.
It makes a great addition to soups, salads, and many traditional European style dishes. Try it in stir-fries and be amazed at how great they taste.
Warm, moist climates are ideal. In warm climates, grow mostly in winter, in cooler zones grow through spring and autumn.
Landcress prefers a moist soil but does not need inundation at all. It is perennial and tolerates very cool conditions.
It is great grown in a pot or tub that can be kept moist.
Sow the seeds by placing them on constantly damp seed raising mix with some lime added and transplant to a permanent position when the seedlings are approx 8cm tall.
From then on apply high nitrogen, soluble plant food every two weeks from spring to late summer.