Tomatoes are best helped by basil, oregano, onions, chives, and nasturtium.
One good example of flowers helping plants is nasturtium and cabbages.
Brassica family members are planted with geraniums, rosemary, and nasturtium in addition to onions.
Plants on the ground, including comfrey, clover, iris and nasturtium, all have positive effects on apple trees.
Popular food plants include holly, ivy, cabbage, nasturtium, honesty, long grasses, cuckoo flower, blackthorn.
Instead, I could nibble a nasturtium - which, this far south, can survive midwinter in the wild.
The pungency of the nasturtium officinale, the water-cress, gave it its name nasi-tortium, that which twists the nose.