I use calendula and nasturtiums but be warned once you introduce them, they love the no dig and can will easily grow every where.
The nasturtium leaves get as big as dinner plates but whilst they are great in salads, as the flowers are too, but you can find if they get away on the compost they strangle other plants if not controlled, I have just rescued some red cabbages! Nasturtiums also die at the first frost but the next year watch out.
Good luck!
Ali
