The trade size gallon I use is actually too small, I think. They are just cheap, and I bought a lot at once. I have to bottom-water the larger plants and let them soak in order to water them adequately.
They don't seem to mind being transplanted, honestly. Usually the root ball comes out as one big chunk, so the roots don't really get disturbed. Important tip for when you do transplant sunflowers - you know how tomato plants grow roots off of buried stem? Sunflowers do NOT do that. So legginess can't be corrected by burying the stem deeper at transplant, like I do with tomatoes.
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