I have 2 grape tomato plants that I just transplanted. They are about 10" high at this point and starting to fill out. This is my first try at raising tomatoes. I read somewhere that they like acidic compost and I have plenty of pine needles, but I don't want to overdo anything and lose them. Here's what thier planted in: 1/2 whiskey barrels 1st layer: about a foot of pine bark & cedar mulch on the bottom. (recycled dog house bedding) 2nd layer: about 8" red clay/sandsoil w/leaf, cow manure and top soil mixture. I thought of adding the pine needle mulch on top.