Kohlrabi produces a swollen stem on top the soil surface that resembles a large bulb. The prepared bulb has a flavour and texture similar to a turnip and the foliage is prepared the same as kale. Kohlrabi grows in the cool spring season, so plant it about two weeks before the last expected frost in your area. Growing kohlrabi in a pot provides you a space to grow the plant even if you don't have a garden bed.
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Things you need
- Potting soil
- Slow-release fertiliser
- Soluble fertiliser
Fill a 2 ½- to 3-gallon pot that has a 12-inch depth with potting soil to within 1 ½ inches of the rim. Mix 1 ½ tbsp of a 10-10-10 blend or similar balanced slow-released fertiliser with the potting soil.
Plant one kohlrabi seedling in the pot. Plant the kohlrabi at the same depth it was growing at in its seedling or nursery pot.
Set the pot in an area that receives a full eight hours of sunlight each day. Choose a location protected from drying winds to minimise water loss and plant damage.
Water the soil one to two times a day, when the top 1/2 inch of soil begins to dry. Kohlrabi has shallow roots and containers dry out quickly, necessitating frequent watering.
Begin application of a 20-20-20 blend soluble fertiliser six weeks after planting. Apply the fertiliser at half the label recommended rate once weekly for the remainder of the growing season.
Harvest the kohlrabi when the swollen, bulblike section of the stem reaches 2 to 3 inches in diameter. Cut the kohlrabi off at soil level to harvest.
Tips and warnings
- The young leaves of kohlrabi are also edible. Harvest up to a third of the leaves when they are at half to two-thirds their mature size.
- Apply a 1-inch layer of mulch over the top of the soil in the pot to prevent the soil from drying out quickly.
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