This is the most elegant trick, and it works because parsley is still alive after you cut it. Treat it like you would a bunch of fresh-cut flowers from the store. Seriously, it’s that simple.
Trim about an inch off the stems with a sharp knife or scissors. This opens up the “straws” inside the stem so they can drink again. Pop the stems into a glass or jar with about an inch of cold, fresh water.
Cover the whole thing loosely with a plastic bag (a produce bag is perfect). This creates a mini-greenhouse, keeping the humidity high so the leaves don’t wilt. Then, just stick the whole glass-jar-bag contraption in the fridge. The leaves will stay crisp for two weeks or more.
Why This is So Cool
Science says that by keeping the stems in water, you’re preventing the plant cells from collapsing. It’s like giving the parsley a continuous sip of water through a secret straw. The bag traps the moisture the plant releases, so it doesn’t have to stress out. It’s basically a vacation for your herbs.