White Mustard

Sinapis alba

herb

White mustard (Sinapis alba) is a fast, cheerful cool-season annual in the cabbage family, 1 to 3 ft tall, with bright yellow flowers that quickly give way to seed pods holding the pale, pungent seeds used to make table mustard. It is a triple-purpose plant: the seeds are ground for condiment mustard, the young leaves are eaten as a peppery salad or cooked green, and the whole quick-growing plant is a popular cover crop and green manure that smothers weeds and, dug in, helps suppress soil pests. It grows from sowing to flower in just a few weeks and is one of the easiest things in the garden.

✅ Plant alongside

Good neighbors that attract beneficial insects or deter pests

• Bean — A legume that pairs well in rotation and shares the open, sunny ground
• Grape — Mustard is a classic cover crop and green manure grown beneath and between vines
• Pea — Another cool-season crop that suits the same early sowing window

❌ Keep away from

🛡️ Pest & disease prevention

Proactive ways to stop trouble before it starts — tap a name with an arrow for its full guide

• Flea beetles →

  Pepper the leaves with tiny holes - use floating row cover on young plants and keep them growing fast

• Aphids →

  Hose off colonies; the fast crop usually outpaces them

• Cabbage worms →

  Pick off the green caterpillars or cover the crop; as a brassica it draws the same butterflies as cabbage

🌾 Harvest & storage

Pick the young, tender leaves for greens within a few weeks of sowing, before they turn too hot and tough. For seed, let the plants flower and form pods, then cut the whole plants when the lower pods turn tan and dry but before they shatter, finish drying them under cover, and thresh out the seed. As a cover crop, cut and dig the plants in before they set seed, while still green and lush.

🥗 Nutrition & benefits

White mustard delivers two foods - peppery young greens rich in vitamins A, C, and K, eaten raw or cooked, and the pungent seeds ground with vinegar and water into table mustard. As a cover crop it also builds and protects the soil. Mature seed and young leaf are the edible parts of this fast, useful, multipurpose member of the cabbage family.