black bottom on my tomateos
i live less than 2 miles from the ocean in south california. my tomateos look perfectly riped except that most have black hard bottom that i have to thraw away almost half of the fruit.what is it? and how to aviod that.my tomatoe plants look healthy ,plenty of tomatoes.i water them about 3-4 times a week,use tomatoe plant food. they get sun most of the day. they don't touch the soil which is mostly clay mixed with purchased soil mix.