I don't use t-posts for tomatoes, Feldon. My experience with t-posts has been with barbed wire fencing and trellises. I usually drive them in about a foot - to where I can't see the spade. If you don't drive them in at least that far they are top heavy and quite unstable. I use CRW cages for vining tomatoes - and if I were doing what she is planning, I would use cages and plastic mulch for organic tomatoes and cages and herbicides for regular tomatoes.
Jack
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