Answer: Sunflowers are difficult to start well indoors because they grow so fast and also need so much sunlight to stay healthy. I'm not sure why they are falling over, although lack of light, overly rich soil, and poor air circulation could all contribute to that happening. You might try acclimating them to the outdoors and planting them to see what happens. You might also want to start some back-up seedlings, either outdoors or maybe by direct seeding in the garden. I'm sorry about the frustration.
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