Sunflower Spouts Day 145

I had no idea that sunflowers seeds would actually sprout! My daughter brought home a cup of potting soil with some planted sunflower seeds. This is approximately 10 days after she brought them home!

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Now i’m trying to figure out where to transplant this so that it will have a chance to keep going. Do sunflowers have long roots? Do they need full sun? Anyone have any ideas?