Cress is a very quick and easy vegetable to grow so its a great way to introduce children to gardening. It can be ready to harvest in as little as a week! Cress is an annual plant that can be grown all year round. Its rich in vitamins B and C, making it a healthy side for many dishes or add into a salad. Often associated with the small punnets bought in shops. The "Cress" that you would find in shops is usually Salad Rape instead. Buy your cress seeds online from Kings!