Garden cress has a slightly negative Ca:P ratio with 70mg calcium and 76mg phosphorous per 100gm. It is a good source of vitamin C at 35mg per 100gm and therefore useful in a mixed leaf salad for rabbits and guinea pigs
Garden cress (Lepidium sativum) is a member of the Brassicaacea (cabbage) family. It is very climate tolerant and easy to grow. The leaves cannot be dried and are always used fresh. This makes it a difficult plant to bring to market commercially. One of the reasons why you should grow your own.
A fast growing plant, cress is edible within a week of sowing, though the plants can grow up to 2 ft tall if left to their own devices.