Tomato Seedlings and growth issues.
So, first time growing tomatoes since youth. In any case I've been having a problem in regards to tomatoes which are about 2.5 weeks since sowing.
A small percentage of the seedlings have a habit of keeling over, and the stem is almost as if you tied a rubber band around it and shrunk it in tightly. They basically snap in half, but they're still physically attached into the ground, and then die off about 2-3 days later.
Haven't lost enough of them to be a problem since it's only usually 10 plants out of maybe 400.
My curiosity is, why does this happen to tomatoes out of all the other plants that I've sown? Do they need stake support at such a early stage?
This happens to both tomatoes in flats as well as directly in the soil, and seems to happen regardless of soil moisture.
My only thought is that the stem of tomatoes is just that weak early on and they possibly grow upward more than they should at first.
So far I've mostly just been mounding up dirt around them to support them but I'm thinking of trenching future tomatoes if this is going to be a problem.