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Japanese mustard spinach

Brassica rapa var. komatsuna

Japanese mustard spinach is part of the Brassica (Mustard) genus and its scientific name is Brassica rapa var. komatsuna. A type of edible vegetable, it mainly grows as an annual plant - which means it typically only grows best for a single growing season. Normally grows with a mound-forming habit. This plant tends to bloom in early summer, followed by first harvests in late spring.

Japan is believed to be where Japanese mustard spinach originates from.

Japanese mustard spinach is great for inexperienced gardeners and those that like low maintainance gardens.

This plant info is provided by the myfolia gardener's wiki. All details about Japanese mustard spinach have been kindly provided by our members.

How to grow Japanese mustard spinach

  • Partial Sun

    +
  • Medium

Japanese mustard spinach likes a position of partial sun and remember to water moderately. Use Zone 3 - Zone 14 as your guideline for the appropriate climate for this plant.

Growing Japanese mustard spinach from seed

Try to aim for a seed spacing of at least 2.97 inches (7.62 cm) and sow at a depth of around 0.25 inches (0.64 cm).

Transplanting Japanese mustard spinach

Companion plants for Japanese mustard spinach

These plants have been known to grow well alongside Japanese mustard spinach so consider planting:

Cinnamon Basil, Rosemary: To try and prevent damage from Cabbage Moth aka Cabbage Butterfly

Repellent plants for Japanese mustard spinach

These plants will not grow well with Japanese mustard spinach so avoid planting these within close proximity:

Annual legumes, such as peas, pole or bush bean, chickpea, cowpea, snow pea, lentils, lupines, fragrant sweet pea, runner bean, hyacinth bean, and yard weeds in the legume family such as clovers, vetches and alfalfa, should not be allowed to grow near this plant. All of these can act as host plants for Alternaria fungus and then transmit it to the Komatsuna.

Common Japanese mustard spinach problems

These problems, diseases and pests are known to affect Japanese mustard spinach plants:

Alternaria mildew may become a problem. It helps to practice crop rotation, plant certified or treated seeds, use an antifungal spray such as baking soda, and keep garden clear of host weeds such as wild legumes – yellow clover, etc.

Cabbage moth aka cabbage butterfly is a significant pest of this plant. Covering the plant in fine netting works great, and using strongly scented companion plants such as cinnamon basil or rosemary in very close proximity to the komatsuna works to some extent… Not as well as netting, though.

Other names for Japanese mustard spinach

Komatsuna

Brassica rapa var. pervirdis,Brassica campestris (rapifera group)

Misspellings: komsuna, komtsuna, komasuna

Japanese mustard spinach care instructions

How long does Japanese mustard spinach take to grow?

These estimates for how long Japanese mustard spinach takes to sprout, grow and harvest are from real observations from real gardeners, right around the world. Start logging and journaling your observations to participate!

Footnotes

Japanese mustard spinach Forums

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