Hi, first yr gardening (Florida), have some tomato plants some doing very well, peacevine cherry ripening slowly but surely, tasty, yellow pear looks good soo far I think, EPB good, but have a purple cherokee & a black krim, both have grown several tomatoes, they are about size of tennis balls & over the past few days have cracked open where the fruit meets the stem. Any one tell me what causes this? Thanks very much!

Oh, We did have a few days of very cool temps, I covered them as best as I could, the plants all look fine otherwise.