OK, I'm not a gardener. In fact I have killed spider plants. And ferns, and aloe vera plants and cacti
But this year I was given 2 strong and healthy tomato plants, about a foot tall. Being told they needed lots of water, I've tried to make sure the soil is always on the moist side, although I do admit I didn't put them in larger pots soon enough.
Anyway, they're looking very sad and limp, especially the top leaves. I've fed them and everything! Anyone got any hints for what I did wrong?? Or should I just accept I'm going to be a plant murderer for the rest of my days? 
I've just been given a cherry tree, god help it