I was looking for some advice with regards to some cress we planted. We bought a little plastic punnet of mustard and cress from the supermarket and decided to plant it out in the garden. In the space of a few weeks is has become quite unrecognisable - big, foliated leaves that are a waxy green colour, and slightly crinkled. Is it still edible like this? What is the best way to manage it, or the best size to harvest it at?