Answer: Fertilizing will not be helpful in this case. Unfortunately, these plants are very fast growing and it is very difficult to grow sunflowers indoors. They need full sun all day long in the garden and indoor conditions are just very dark in comparison. Although you might be able to stake them, it is still a relatively long time before you will be able to plant them outdoors. This is why sunflowers are usually direct seeded in the garden rather than started early. I'm sorry I can't be more helpful.
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