It's irreversible. It is important to get plenty of good rapid growth before hot weather arrives. Garlic can double in size in its last month of growth, and removing the scapes (the hard central stem) of hardneck garlic can increase the bulb size 25%.

How do you regrow garlic scapes?

Add a bit of water at the bottom of your shot glass or small container – just enough to cover the bottom of your clove (don't submerge the clove or it'll rot). Keep this on your windowsill and after a few days, you'll have scapes! Let them grow until they're several inches tall, then cut from the top.

Should I cut off the garlic scapes?

Since the bulb is what we eat, we recommend cutting the scape. Plus, scapes are delicious and can be used just like garlic, but they are ready a month or two before the garlic bulb. ... Not all of your scapes will come at once, so remember to revisit the patch weekly until all the scapes have been removed.