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Brassica juncea

Osaka Hardy Mustard Greens

Regular price $4.95 USD
Regular price Sale price $4.95 USD
Sale Sold out
# of seeds per packet
Organic Status
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20 days baby, 40 days full size. Osaka Hardy is a Nature & Nurture Farm original. It began with Purple Osaka mustard growing in our hoophouse through 2 polar vortex winters 2014 & 2015 where outdoor temps reached -20°. We saved seeds from the survivors and we are very pleased with the result. Hardier in the cold than traditional ‘Purple Osaka,’ this variety has a diversity of leaf shapes and colors. Leaf colors range from deep purple to green & purple and leaf shape from round to elongated. This variety adds to our collection of cold hardy seeds that don’t need a second layer of protection inside the hoophouse unless temperatures dip below -5°. Others include Grand Rapids lettuce, Abundant Bloomsdale Spinach, and Vit Mache. Great for gardeners with cold frames and low tunnels. As baby greens it adds liveliness (and a touch of spice) to monotone lettuce salad. Larger leaves are cooked as mustard greens. NN

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Growing Instructions (for USDA Zone 5b):

Mustard greens can be grown in the spring, summer, and fall, though they prefer an air temperature range of 60 - 75° . Direct sow seeds outdoors 4/15 - 8/30. For baby greens, broadcast sow seeds ½” deep, 60 seeds per square foot. For mature leaves, sow seeds 1” apart in rows 18” apart. Days to germination: 4 - 10. Sow every 3 weeks for continuous harvest, or let them re-seed themselves to have low maintenance self-sowing, edible “weeds”. Keep well watered during hot weather. It can grow in part shade. Tolerant of light frosts.


Baby greens:  cut entire plant when 3 - 6” tall for cut-and-come-again baby greens (cut plant with scissors 1 - 2" above soil level so you don’t damage the growing crown.) Return for several harvests. Harvest mature leaves individually as desired.  Eventually the plants will begin to “bolt” (flower) and make seed. (See Seed Saving Instructions.)

 Seed Saving Instructions for gardeners:

Brassica juncea is insect pollinated and will cross-pollinate with other Brassica juncea mustards (which are not that common). Isolation distance: ½ mile. Minimum population size: 10 plants. Collect seeds from the best plants once pods have turned from green to tan but before seeds have been released. Clean seed as a dry-seeded crop.

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Growing Instructions