Tomatoes crack when the water supply fluctuates. The influx of water into the plant makes it expand, only the fruit cannot expand and splits. Slow and steady water supply is best. Drippers are what I use, run off a dustbin of water that I top up daily, sort of water-butt style.
The first courgettes are forming, runner beans are starting to flower. I grow carrots and potatoes in old florist buckets, and the carrot thinings are good so far. Made the first lot of blackcurrant jam. The redcurrants look like they may need picking next weekend, followed by more blackcurrants, then bullace, plums and eventually, apples. Picked the first blackberries yesterday and put them in the freezer. I add to the bag until I have enough for a batch of bramble jelly.
Still waiting for summer, here in the UK. Mind you, the plants like the rain and I don't have to go out and water, so I shouldn't moan.