I like to grow garden cress (lepidium sativum) at home. It's easy and takes only 5 or 6 days to harvest. The only and most important factor when growing a garden cress at home is humidity; garden cress likes moist environment.
In Poland it is always called rzeżucha, although the correct name is pieprzyca siewna. The word 'rzeżucha' is so common that even the seed companies name the garden cress that way.
It's usually sowed at Easter to decorate eggs or tables, but it's a great addition to salads, soups or sandwiches through all year.
The garden cress is slightly spicy in taste and it contains vitamins such as: A, B1, B2, E and PP but also minerals such as: sulpfur, chromium, potassium, manganese, magnesium and calcium. So, it's worth growing in winter when fresh and healthy vegetables from a garden aren't so readily available.
I sowed it on a piece of paper towel and sprinkled with water twice a day. These are my results!