Cress is lovely to grow at home with children because it grows so fast! No long wait to see the seeds sprout. Within a week you have something that you can eat. No need for soil – I used an egg box, some tissues and the seeds.
You could make a picture diary of this process – either take photos or do drawings. If you water the seeds at the same time each day it becomes a nice little ritual either at tea time or snack time.
(If someone in your family is allergic to eggs use a different growing container)