Red Tomatoes are Green Inside
My beautiful, apparently ripe, tomatoes are green inside when I cut them. The core is green and hard, as is part of the rim. What causes this? The tomatoes are grown on stakes and do not rest on the ground. If a tomato is not green on the inside, it appears to be overripe. The varieties we're growing this year are Early Girl, Goliath and Roma and this happens to all of them. The vines are healthy and have no pests.
I've tried leaving them on the vine, picking and ripening in the house for a few days and the result is the same.
Thanks for any advice. May be too late for this year's crop but this has been happening every year and we want to prevent it for next year's crop.