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Garnet Giant|Red Giant Mustard Green Guide

Mustard greens are rich in vitamins A, C, and K and have immune system boosting properties. This garnet giant has the darkest, broadest leaves of any mustard green and is a sight to behold. Great for a pop of color in any salad!


Mustard greens grow well in cooler temperatures between 45°F-70°F. They do great in containers and gardens. Bank on Seeds recommends direct seeding.

If Direct Seeding

  • Direct seed outside 2 weeks after last frost date; or
  • Direct seed into a container 8-10 inches deep and wide anytime of the year. It can be placed outside when the temperature is between 50°F-70°F; or

If Transplanting

Begin the growing season early and start the mustard green seeds indoors in pods 2 weeks before the last frost date; germination is best between 60°F-70°F. It can be transplanted outside 4 weeks later.

Sow the mustard green seeds ¼ inch-deep, 2 inches apart with rows spaced 12 inches in between. Germination will take 4-7 days.


Mustard greens grow easily and like well-draining, rich soil free of weeds. They also like full sun but can tolerate partial shade. Water regularly to encourage even growth. Check the top 2-3 inches of soil and if dry, then water it.

Use 5-5-5 or 10-10-10 fertilizer at half strength every 6-8 weeks.

Fertilizer is not a requirement.


Days to maturity take 25-45 days. Pick the leaves as needed as a cut and come again plant. Baby leaves will be sweet and tender and best harvested around 3 weeks in – leaving longer will enhance the bitter taste. More will grow in another month or so – you can harvest the same plant 3-4 times.


Aphids, cabbage loopers, flea beetles, slugs - spray off with water, handpick, insecticidal soap, diatomaceous earth, row covers, neem oil

Leafspot, black rot, mildew - do not water from overhead, let dry between watering, keep free of weeds, ensure enough air circulation, cut off affected parts, fungicide, neem oil, rotate crop every 3 years

*Companion plant mustard greens with mint, chives, carrots, peas, radishes, and marigolds. Avoid planting with beans and sunflowers. *

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