Brassica oleracea (capitata group)
~6,000–7,000 seeds/oz; 210–250 seeds/g. Blue-purple foods such as red cabbage and purple cauliflower contain anthocyanins and phenolics, which benefit the urinary tract, memory and immune system.
Culture: Exposure to hoarfrost is good for cabbages. They double their sugar content after one month of cold.
Red cabbage seedlings are often used for microgreens.
Minimum germination soil temperature 40°, optimal range 55–95°, optimal temperature 77°. Emergence takes 15 days at 50°, 9 days at 59°, 5 days at 77°.
Days to maturity are from direct seeding. Subtract 20 days from date of transplanting.
Note: We cannot ship packets greater than ½ oz. (14 grams) of any Brassica into the Willamette Valley. The State of Oregon prohibits shipping any commercial quantity of untreated Brassica, Raphanus or Sinapis because of a quarantine to control Blackleg.
Culture: Hardy. Require warm temperatures to germinate (68-86° ideal) but need 60s during seedling stage for optimal growth; higher temperatures make seedlings leggy. Heavy feeders; for best growth, need regular moisture and 2–3' spacing. Have done well for us succeeding onions and garlic in beds. Cauliflower and broccoli are damaged by hard frosts, especially in spring.
Young broccoli sproutlings make good microgreens.
- BR: Black Rot
- BS: Bacterial Speck
- DM: Downy Mildew
- FY: Fusarium Yellows
- TB: Tipburn
Pests & diseases: 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.
Materials: 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.
Materials: Spinosad, Pyganic, Mycotrol ESO.
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.
Materials: Actinovate, copper compounds may help for some of these diseases.