How to grow White Vienna kohlrabi
The White Vienna kohlrabiis a European heirloom variety particularly well-suited to cool climates and Quebec growing seasons. Known for its rapid growth, tender, white, and slightly sweet flesh, it is easy to grow in the vegetable garden and allows for multiple harvests in a single season.
Unlike traditional cabbages, kohlrabi does not form a head. Instead, it develops a swollen, rounded stem above the ground, pale green in color, which is the main part consumed. This heirloom variety prefers the cool temperatures of spring and autumn. It tolerates light frosts, but periods of intense heat can slow its growth and make its flesh more fibrous.
To obtain beautiful, tender, and tasty kohlrabi, we recommend growing them in soil that is rich in organic matter, loose, fertile, and well-drained. Kohlrabi particularly enjoys soil that maintains constant moisture without being waterlogged.
You can start seeds indoors about 4 to 5 weeks before transplanting to the garden, or sow directly in the ground as soon as the soil is warm enough to be worked in the spring. To extend harvests, we recommend successive sowings every two to three weeks during cool periods.
For autumn harvests, seeds can be sown from mid-July to the end of August in many regions of southern Quebec. The young plants will thus benefit from the return of cooler temperatures at the end of summer.
For spacing, allow for about 10 to 15 cm between each plantand 30 to 40 cm between rows. Place two seeds per hole, then keep only the most vigorous plant after germination.
It is important not to crowd the plants too much to allow their swollen stems to develop uniformly.
Tips and tricks
Kohlrabi enjoys the company of onions, garlic, shallots, and aromatic herbs such as thyme, sage, and dill. These companion plantings help diversify the garden and welcome various beneficial insects.
We also like to grow scented marigolds near vegetables in the cabbage family. Their flowers attract certain pollinating insects and contribute to the biodiversity of the vegetable garden. Their effectiveness against kohlrabi pests, however, is not guaranteed.
To obtain particularly tender and juicy flesh, maintain regular soil moisture. Natural mulch, such as straw or shredded leaves, helps keep the soil cool during hot periods.
The secret to excellent kohlrabi is to harvest it young.White Vienna is particularly tasty when its swollen stem reaches about 5 to 8 cm in diameter, roughly the size of a tennis ball. At this stage, its flesh is generally tender, crisp, and slightly sweet.
Avoid waiting until it becomes too large, as large kohlrabi can develop a more fibrous texture, especially when suffering from a lack of water or excessive heat.
The first light autumn frosts are generally well tolerated by this variety. Cool temperatures promote steady growth and allow for an extended harvest period. In the garden, it does not survive the extreme cold of the Quebec winter. In an unheated greenhouse, however, it can be harvested for a good part of the winter: at our place, we ate it until February.
To reduce the risk of diseases and harmful insects, avoid growing kohlrabi in the same spot as cabbages, broccoli, radishes, turnips, and other Brassicaceae for at least three to four years.
Watch out specifically for flea beetles, which can perforate young leaves in the spring. Using an insect-proof net from the time of sowing or transplanting is an excellent natural protection method.
To store your kohlrabi after harvesting, remove the leaves and place the swollen stems in the vegetable drawer of the refrigerator, ideally in a container or a perforated bag that limits drying out. They can thus be stored for several weeks depending on their freshness and storage conditions.
Our seeds are vigorous, open-pollinated, and grown in the Quebec climate.
- Species: Brassica oleraceavar. gongylodes
- Variety:White Vienna
- Origin:Central Europe, historically associated with Vienna, Austria.
- Indoor sowing:March to April, about 4 to 5 weeks before transplanting.
- Direct sowing:April to June, depending on climatic conditions and soil temperature.
- For autumn harvests:Sow from mid-July to the end of August in southern Quebec, adapting the dates to your region.
- Sowing depth:0.5 to 1 cm
- Germination time:5 to 10 days, under favorable conditions.
- Ideal germination temperature:15 to 24 °C
- Soil:Rich, loose, fertile, humus-rich, and well-drained.
- Location:Full sun to light partial shade. Prefers cool temperatures.
- Spacing between plants:10 to 15 cm
- Spacing between rows:30 to 40 cm
- Height at maturity:About 25 to 40 cm, including foliage.
- Maturity:About 50 to 65 days after sowing, depending on growing conditions.
- Seeds per packet:+/- 100
Our seeds are guaranteed for the year of purchase.