Used for MANY uses!

1: decoration
2: blocking the corruption
3: blocking the crimson
4: im pretty sure you can craft with it

You cannot craft with sunflowers.

But you also forgot 4 other things about the sunflower. It gives you increased movement speed, slight luck increase, and nullifies graveyards. It also lowers enemy spawn rate.

oh yeah the buffs

i was thinkin about mc sunflowers for the craftin because they make yellow dye