What to Do If a Bok Choy Flowers

Miss Chen
A few bok choy (Brassica rapa var. chinensis) flowers before the harvest don't have to mean total failure. The flower stalks indicate the first stages of the end of life for this cool-season vegetable, meaning no more leaves for the harvest. When the first yellow flowers appear, you have a few options to make the best of the situation.

Harvest the Crop
When one or two bok choy plants send up a flower stalk, the rest of the plants generally aren't far behind. At this point, harvest the rest of the bok choy plants by cutting each plant at the base, slightly above the soil line, with a knife. Cut carefully away from yourself to avoid injury. Disinfect the harvest knife in hot, soapy water or a solution of 1 part rubbing alcohol to 1 part water. Use bok choy fresh or store it in the refrigerator for two to three weeks.

Pick the Flowers
The bok choy's edible flowers taste best right before they open. If your bok choy crop is starting to produce elongated stalks and flowers from the center of each plant, pluck off the flower stalks and add them to salads. If the plant has only just begun to flower, you may still get a leaf crop. Pick a few leaves and taste them. If they're woody, pick the rest of the flowers and toss the plants on the compost pile. Otherwise, harvest the best tender leaves and flower stalks before discarding the plants.

Collect the Seeds
When bok choy flowers, you can harvest the seeds. Allow a group of plants to remain standing -- ideally two to three or more for pollination purposes -- until the flowers turn into seed pods. As the seeds mature, the pods turn from green to brown as they dry out. Cut off the pods and put them in a paper bag for a few weeks then break open the pods and dump the seeds into a separate paper bag. Store them in a dry spot until next planting season. Properly stored seeds can remain viable for up to five years.

Prevent Flowering
Bok choy bolts -- flowering and then going to seed -- rapidly in hot weather but you can slow the process by growing them from seed in late summer and early fall. In mild climates, plant bok choy in late fall and grow it through the winter. Bolting also occurs when optimal spring temperatures turn cold for a prolonged period and then suddenly warm again. Plants that are larger and more mature are affected the most by these changes in temperatures. You can even grow bok choy through the winter even in areas with mild frosts. Bolting is less likely to occur by planting transplants that haven't been stressed, keeping the garden weed-free and maintaining consistent water practices. Also, look for bolt-resistant varieties like "Joi-choi" and "Chin-Chiang." Before you plant, keep in mind that this plant can spread invasively in some areas.
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