Growing Mustard Herb Seed

  • Days to Maturity: Annual, 70-90
  • Hardiness Zone: 5-7
  • Planting Depth: 1/2"
  • Plant Spacing: 6-8”
  • Growth Habit: Upright
  • Soil Preference: Rich and well-drained
  • Temp Preference: Cool
  • Light Preference: Full sun to partial shade
  • Color: Long green stems with bright-yellow flower clusters
  • Flavor: Varies—sweet to spicy, with hints of tang or wasabi

Sowing and Growing

Sow seeds directly 1/2" deep in early spring before the final frost. Start inside about 6 weeks before planting outside. Make sure the transplants have 4-6 mature leaves. Plant mustard in a partial shade area for prolonged greens before flowering. Aim for maturity 2-3 weeks after the first frost of the year in your area. Germination takes up to 10 days.


If you want to harvest this herb for its greens, you can use scissors throughout its growth to cut fresh leaves as needed. Avoid using any yellow leaves, as mustard greens should be harvested in the earlier stages of its maturity. If you want to harvest the seeds of the plant, allow flowering and collect the stems with the ripe pods attached. Store in a paper bag. Once they’re completely dry, separate the seed from the pods and store in a glass jar.

Explore these Mustard Herb Seed Varieties:

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