I won't amend or fertilize my soil... stuff just grows crazy huge around here. Its old but undisturbed black adobe that is so rich in nutrients that plants often exceed 2X their advertised heights. If I amend the soil for better aeration, roots find it too easy to build an extensive network and plants get all gargantuan and unruly. I also withhold water as much as possible to get plant size down to manageable. I abandoned some hybrid-tea rose bushes 12 years ago along the back fence... never sprayed or pruned or watered 'em. Now they are 8-ft monsters covered in blooms. I figure tomato plants would grow too big like all the other plants do... so I'll treat 'em mean & hope they don't go humongous on me.
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