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My tomatoes plants are 8weeks old about a foot tall with big leaves and thick stems. They are in solo cups and seemed healthy, I have a fan blowing on them a few hours a day to help sturdy the plants up. The leaves are touching other plants and recently when I started to move them the stems seemed to have shard time holding the plant up.The bottom inch of the stem is purplish and seems smaller in diameter Then the rest of the stem.what's wrong or what can I do to sturdy up the plant? Stake it? I am almost ready to transplant them outside after a week of hardening them up
I agree with behillman if you are ready to plant outside then plant them deep enough to hold the plant upright. Tomatoes will root out along the stem if planted deep so you should have no problem.
But if you still feel that they need more support then put in a stake to also hold them upright.
The depth that you planted the seed does not have anything to do with the situation that you now find. Seed when planted should not be deeper than 1/2 the thickness of the seed for indoor planting. Some seed should not even be covered that much.
I would think the reason for the way the stem is growing is because of the small container that they seedlings are in. You probably have a root bound situation. But again if you are ready for transplanting to the outside you shouldn't have anything to worry about.