I have got a nice bay tree with a twisted trunk. Have had it five years and it is a good shape (pruned it severely in the spring) but quite an odd colour. I presume I have to feed it something - but what? I seem to remember reading somewhere eons ago that tomato fertiliser was the thing to use but am not sure if this is correct. It is a sort of light lime green colour at the moment and really want it in good nick for the autumn. Any help please!