Senposai Mustard


Senposai Mustard

Brassica rapa
(40 days) F-1 hybrid. Developed in Japan, a cross between Komatsuna (Japanese Mustard Spinach Brassica rapa) and regular cabbage. “Customers buy it once because it looks absolutely stunning, then they buy it again because it is extremely delicious. Absurdly productive and easy to grow,” raves John Eisenstein of Port Royal, Pa. Round medium-green leaves are wonderful in okonamiyaki or for braising. A spring sowing will stand the entire summer (even through drought) and well into fall before bolting. Can be overwintered in warmer climes or used for spring greenhouse salad production because it grows so rapidly. Open plant habit requires 12–18" spacing. 20,600 seeds/oz. Cold-hardy.

3218 Senposai
Item Discounted
A: 1/16oz for $3.25  
B: 1/8oz for $4.50  
C: 1/2oz for $7.25  
D: 1oz for $12.00  
E: 4oz for $29.00  
K: 1lb for $96.00  

Additional Information

Asian Greens

  • All open-pollinated except where noted.
  • Days to maturity are from emergence after sowing; from transplant, subtract 20 days.

Culture: Wire hoops and row cover keep out flea beetles and are a must for pristine salad or braising mixes!


  • ALTS: Alternaria Leaf Spot
  • BL: Black Leg
  • Black Rot
  • BSR: Bacterial Soft Rot
  • DM: Downy Mildew

Major pests: Cabbage Looper, Diamondback Moth, Imported Cabbageworm
Cultural controls: control cabbage-family weeds near crop fields, till under crop debris of early-season brassicas after harvest.
Material controls: Spinosad, Bt.

Pest: Flea Beetle
Cultural controls: floating row covers, mulch with straw, time plantings for fall harvested crops only, crop rotation, perimeter trap cropping.
Material controls: Spinosad, Pyganic.

Pest: Cabbage Root Maggot
Cultural controls: time planting to avoid first hatching, use row covers, control weeds.

Major diseases: Black Rot, Alternaria Leaf Spot, Blackleg, Club Root, Downy Milldew, White Mold
Cultural controls: avoid transplanting plants with yellow leaves or v-shaped lesions, crop rotation, destroy crop debris after harvest, avoid overhead irrigation, control weeds, allow for good air movement.
Material controls: Copper.

Note: because of a rule issued by Oregon, we cannot ship brassica packets larger than ½ oz. (14 grams) into the Willamette Valley, except those that have tested negative for Black Leg and Black Rot. Check descriptions for information.

Germination Testing

For the latest results of our germination tests, please see the germination page.

Our Seeds are Non-GMO


All of our seeds are non-GMO, and free of neonicotinoids and fungicides. Fedco is one of the original companies to sign the Safe Seed Pledge.