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Hi. Yes, sunflowers willHi. Yes, sunflowers will 'flop,' usually when they aren't getting quite enough sun and they are straining to get more sun-- the stems grow too thin. They may flop when overcrowded too. BUT, the easy fix it to give them a little support-- you can use skewers (those thin sticks people use when grilling). A big package is only about a dollar. Or just strong sticks, a little thicker than your sunflowers. Let the sunflowers lean against the sticks or tie them gently with a loop of yarn or string. If your sunflowers are still floppy when large graduate to bamboo sticks or stakes or whatever you can find. Some sunflowers have thick stems and are quite sturdy on their own. Good luck. With a little support they'll make it! –Pam