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Flat Cabbage

Brassica rapa (BRAS-ih-ka RAY-puh ross-YOO-lair-iss)

Family: Brassicaceae Non-native Herbaceous (1-3 ft)

Tat Soi is a cool weather vegetable plant in the mustard family that is grown as a food crop. The genus name Brassica is Latin for cabbage. This plant can be grown as a spring or fall crop in fertile, moist, well-drained soil in full sun by direct seeding or transplants. The prostrate varieties can withstand temperatures below zero and can be harvested during the winter. Protection from the summer heat is advised when grown for a fall crop. Higher temperatures and lack of proper water can cause the plants to bolt. That will cause the plant to produce its flower stems prematurely, leading to a poor harvest. There are both upright and prostrate varieties with the leaves generally being very dark and shiny and either smooth or crinkly. The flavor is similar to bok choi and the plant can be harvested at various stages of growth from young leaves to a mature rosette. The young leaves and small rosettes are crisp, thick and tender with a mild taste. They are typically used in salads and stir-fry. It is also used in preparing soups, or added to other dishes, such as pasta. The foliage of Tat Soi is attractive enough to be grown in the front border of a flower bed in addition to the edible garden. Click here to see a calendar of planting schedules, time-to-harvest, and recommended spacing. Potential problems, insects and diseases: Slugs, snails, cutworms, and flea beetles can be a problem. See pests of crucifers to the left.

Source: NC State Extension Gardener Plant Toolbox ↗ NC State Extension Gardener Plant Toolbox, 53 attributes.

How it fits the guild

Guild layer 4 - Herbaceous (1-3 ft) Optimal soil pH Acid (<6.0); Neutral (6.0-8.0)
See companions & conflicts ↓

Companions & Conflicts

Curated pairwise relationships between this plant and others in the library — who feeds whom, who competes, who confuses the pests. Green reads as a good pairing, red as one to avoid.

No curated interactions recorded for this species yet.

Also noted by NC State

Related species the NC State Plant Toolbox flags for this plant — look-alikes to tell apart, and plants that play a similar role in a planting. Ones we carry in the library are linked.

Fills a similar niche Brassica oleracea Kai Lan & Chinese Kale Group Brassica oleracea Kale Group Brassica rapa Chinensis Group

Full plant profile

Growing Conditions
Plant type
Annual; Cool Season Vegetable; Edible; Ground Cover; Vegetable
Life cycle
Annual
Light
Full sun (6 or more hours of direct sunlight a day) | Partial Shade (Direct sunlight only part of the day, 2-6 hours)
Soil texture
Clay; High Organic Matter; Loam (Silt); Sand
Soil pH
Acid (<6.0); Neutral (6.0-8.0)
Soil drainage
Good Drainage | Moist
Available space
12 inches-3 feet
NC region
Coastal; Mountains; Piedmont
Mature size
Height: 0 ft. 6 in. - 1 ft. 0 in. | Width: 1 ft. 0 in. - 1 ft. 6 in.
Growth rate
Rapid
Maintenance
Medium
Canopy layer
4 - Herbaceous (1-3 ft)
Form & Appearance
Habit / form
Erect; Prostrate
Texture
Medium
Leaf color
Black; Green
Leaf type
Simple
Leaf arrangement
Alternate; Rosulate
Leaf shape
Peltate
Leaf margin
Undulate
Leaf feel
Smooth
Leaf value
Edible; Long-lasting; Showy
Leaf size
> 6 inches long, 3-6 inches wide
Hairs present
No
Leaf detail
The cup shaped, very dark green, shiny leaves are arranged in a dense rosette are either smooth or crinkled.
Flower color
Gold/Yellow
Flower form
Insignificant
Flower shape
Cross
Flower size
< 1 inch
Flower detail
Small, insignificant, yellow 4-petaled flowers in clusters early spring
Bloom time
Spring
Fruit type
Siliqua
Fruit detail
The fruit dries and splits when ripe.
Stem color
Green; White
Stem detail
Thick whitish green edible stems
Wildlife & Ecology
Native status
Non-native
Origin
Mediterranean, Iran, Africa
Play value
Buffer; Easy to Grow; Edible fruit
Food & Medicine
Edible parts
Fruit; Leaves
Fruit type
Siliqua

Edibility

Edible leaves raw or cooked.

Landscape Use
Landscape location
Container; Patio; Slope/Bank
Landscape theme
Edible Garden; Winter Garden
Design feature
Border; Mass Planting; Small groups
Garden tags
#vegetable garden #edible leaves #vegetable #cool season vegetable #problem for horses #cool weather plant #showy leaves #edible garden #containers #full sun #winter garden #border #microgreens
Problems & Resistance
Insect problems
Slugs and Snails Found on Flowers and Foliage; Insect and Related Pests of Vegetables; Pests of Crucifers
Problems
Problem for Horses
Propagation
Seed

Planted at Hunnicutt

Nobody’s planted this one yet.