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Tomatoes
Mick B-O-A
Posts: 1
Wot causes Thick outer skin on tomatoes 
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Mick B-O-A
Posts: 1
Mick B-O-A
Posts: 1
Posts
It's usually genetic, Mick. Some varieties have thicker skins than others. Romas and other plum varieties, for example, have thick skins. Temps and watering practices are sometimes said to be a factor but I've never found it.