I bought the soil from a store and it is for planting seeds so I think it already has all the necessary nutrients.
Last year I used a different seed but sunflower turned out the same. Maybe sunflower only wants to grow outdoors. My plan is to replant them outside when nights are warm enough.
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Good luck for the next time, @greddyforce and keep letting us know the result. I also want to learn as well as know the reason to cause that issue. Thank you!
Thanks! I will be making another update post sometime in the coming weeks.