flowering edible rape
Other Common Names Include:
Yu Choy, Yow Choy, You Cai, Aburana, Cai Ngot, Yuchaeip
Latin Name: Brassica rapa subsp. chinensis var. oleifera
Plant Family: Brassicaceae
Close Relatives: Broccoli, cabbage, kohlrabi
Uses and Markets: Culinary (used predominantly in Asian cuisine e.g. leaves are steamed or boiled for use in soups and stews or stir fried).
Production Life Cycle in Ontario
Annual
Hardiness Zone
N/A
Special Notes
Brassica crops are cool-season vegetables. They perform best at moderate temperatures and can withstand mild frosts.
Propagation method
Most commonly by direct seeding, less commonly by transplants from seeds.
Greenhouse Seeding/Propagation Dates:
N/A
Field Seeding Date:
Mid April to mid September.
Field Transplanting Dates
Late April to mid September.
In-row spacing
5-10 cm
Between row spacing
30-45 cm
Optimal Soil temperature at planting
>5°C
Fertility
No current Ontario fertility recommendations exist. Research and recommendations from outside Ontario do not necessarily apply to Ontario growing conditions. Experience from Ontario field trials suggests that Flowering Edible Rape requires 80-120 kg N/ha for each planting through the growing season. Click here for phosphorus and potassium application guidelines and for more information on specialty crop fertility.
Soil type
All soil types, growing best in sandy loam soils.
Soil pH
5.5-7.5, lower pH may cause the prevalence of clubroot to increase.
Special requirements for growth habit
None
Optimal Temperature Range
18-24°C
Temperature sensitivity
Frost tolerant.
Irrigation requirements
Irrigation is beneficial under normal Ontario conditions.
Days to harvest
50-55 days after direct seeding.
Specialized equipment
None
Harvest
Harvest Scheduling
Successive plantings. Multi-cropping possible.
Hand harvest or machine harvest
Hand harvest
Quality parameters/grades
No established grades. Quality is determined by the market.
Additional Harvest Notes
Harvest when the lowest (most mature) buds are unopened, or starting to open into flowers, depending on the target market. Harvest during cooler parts of the day to reduce moisture loss and cooling costs. Remove field heat as soon as possible after harvest.
Post harvest
Special handling/curing
None
Storage Conditions
Relative humidity (RH):
Temperature: 0°C
Air Exchange: N/A
Duration: 10-14 days
Specific pests observed on this crop in Ontario (observations based on limited experience with this crop)
Insects and Invertebrates: Flea beetles, cabbage maggot (Delia radicum), swede midge (Contarinia nasturtii), diamondback moth larvae (Plutella xylostella), imported cabbage worm (Artogeia rapae), cabbage looper (Trichoplusia ni), cutworms, leafminers (Liriomyza spp.), aphids
Diseases: Club root (Plasmidiophora brassicae), downy mildew (Peronospora parasitica), Alternaria leaf spot, turnip mosaic virus (TuMV), baceterial soft rots (Erwinia cartovera, Pseudomonas spp.)
Other: none
Other Potential Pests: The following pests have not been observed on this crop in Ontario. However, they are either significant concerns for closely related plants in Ontario, or are reported on this crop in other production areas. This is not a comprehensive list of all potential pests. Not all of these pests will necessarily survive Ontario’s climate, but could potentially survive in a protected environment (e.g. greenhouse, storage facility).
Insects and Invertebrates: Earwigs, slugs, thrips, tarnished plant bug (Lygus lineolaris) , seedcorn maggot (Delia platura)
Diseases: Bacterial leaf spot (Pseudomonas syringae), black rot (Xanthomonas campestris), damping off (Pythium, Rhizoctonia spp.), Fusarium wilt (cabbage yellows)
Other: None
*Indicates pests commonly mentioned as causing significant damage or economic loss to this crop in other regions.
Comments
To date the following pests have been the most significant in Ontario: flea beetles, club root, downy mildew. Flea beetles tend to prefer specialty crops (e.g. Chinese cabbage, bok choy, daikon) over traditional brassica crops. Club root damage will be less when grown during cooler times of the year (e.g. April and Aug/Sept. plantings). Flowering edible rape is less susceptible to clubroot than some other Brassica vegetables, such as Shanghai pak choy, but is not resistant to the disease.
Many specialty Brassica crops are included in Crop Group 5: Brassica (Cole) Leafy Vegetables. A complete list of all crops included in Crop Group 5 can be found at the following link on Health Canada’s website: http://www.hc-sc.gc.ca/cps-spc/pest/part/protect-proteger/food-nourriture/rccg-gcpcr-eng.php#a5. For more information on Crop Groups, refer to the Pest section. Always refer to product labels, and follow all directions specified on the label, before applying any pest control product. For more information, consult an OMAFRA specialist. For pest control products registered on this crop group refer to OMAFRA Publication 838, Vegetable Crop Protection Guide. For more information on pests of Brassica crops, refer to the Brassica module of Ontario CropIPM on the OMAFRA website.
None
- McDonald, M. R., Janse, S., and K. Vander Kooi. 1999. Muck Vegetable Cultivar Trial & Research Report 1999. Department of Plant Agriculture, University of Guelph, unpublished.
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- McDonald, M. R., Janse, S., and K. Vander Kooi. 2001. Muck Vegetable Cultivar Trial & Research Report 2001. Department of Plant Agriculture, University of Guelph, unpublished.
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