How to Regrow Bok Choy from the Base

Start with a firm, healthy plant. Green and purple varieties both regrow the same way, so use whatever you have. If you are buying from the store, look for a head with a solid, undamaged bottom. That base is what does the work later, so you want it in good shape. A tired or mushy bottom will rot in water instead of sprouting, so pass on anything soft at the root end.

Get to know the plant before you cut. The leaves and stalks up top are what you eat. The tight cluster at the very bottom, where all the stalks meet, is the crown. That crown holds the growing point, and it is the reason a chopped-off base can push out brand new leaves. Once you can see where the leaves end and the base begins, the rest is quick.

Hold the head steady and slice straight across, taking the leaves for the kitchen. A sharp knife makes a clean cut and does less damage to the crown than sawing at it. Aim your cut a couple of inches up from the very bottom. You want to keep enough of the base intact that the growing point stays under the blade, not sliced through. The leaves go in your fridge. The base is what you are keeping.

What is left in your hand is the piece that regrows. It is a short, cupped base about two inches tall with the cut ends of the stalks fanning out and the crown tucked in the middle. Look at the center and you can already see the tiny pale leaves waiting to grow. Do not trim it down any further. That little stub has everything it needs to send up fresh leaves once it gets water.

Grab a shallow dish, a small jar, or a bowl. Fill it with about half an inch to an inch of water. You want the cut base to sit in water without the whole thing being submerged. If the crown drowns, it rots. If the base is bone dry, nothing happens. A little water at the bottom, refreshed as it drops, is the sweet spot. Any container from the kitchen works.

Set the base into the dish cut-side up, so the crown faces the light and the bottom sits in the water. Put the dish somewhere bright, like a sunny windowsill. Within a few days you will see new green leaves pushing up from the center. Roots will start feeling their way down into the water. Top up the water when it drops and swap it out every couple of days to keep it clean.

Water gets you fresh leaves for a while, but the base runs out of stored energy. To keep it going, move it to soil once it has roots and a bit of new growth. Fill a small pot with drainage using organic potting soil, nestle the base in so the crown sits just above the surface, and water it in. From there it can grow into a full plant. In a garden bed, tuck it in the same way and let it size up.

Here is the payoff. A few days in water and the center of the base fills in with a bright green rosette of new leaves. That is fresh bok choy coming back from a piece you were about to throw away. Snip what you need for cooking and let it keep producing, or plant it out and grow a full head. One store-bought plant just turned into an ongoing supply, and you can do the same with the next one.