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Tomato advice needed: To prune or not to prune?
(mander.xyz)
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I personally would not prune until it's bushy so they have some protection from the elements. If they are in a controlled environment (heat/light intensity) and you know what you are doing, you can prune suckers at this stage but they can easily develop issues doing this. Also since they are setting flowers, make sure they get the calcium/magnesium they need else you'll get blossom end rot.
I see, I will let them grow a bit more bushy, since I don't know what I am doing ๐