A man holds Superschmelz or Giant White Kohlrabi on a white background.
Kohlrabi Seeds, Superschmelz or Giant White
Superschmelz or Giant White Kohlrabi on a white background next to an old camera.
Superschmelz or Giant White Kohlrabi growing in the garden.
A man holds Superschmelz or Giant White Kohlrabi on a white background.
Kohlrabi Seeds, Superschmelz or Giant White
Superschmelz or Giant White Kohlrabi on a white background next to an old camera.
Superschmelz or Giant White Kohlrabi growing in the garden.

Kohlrabi Seeds,
Superschmelz or Giant White

4.116 Reviews#KL103 · 400 seeds
Price
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Description

(Brassica oleracea var. gongylodes). Reaches epic, mammoth proportions all the while remaining tender and buttery in texture. This spectacular light green kohlrabi makes the largest bulb of any variety, up to 14 inches across, and weighing up to 20 pounds! Yet the flesh is supple and never gets fibrous. This German heirloom is of champion size and hails specifically from the town of Schmelz in Saarland. Provide very rich soil and plenty of space to achieve gigantic proportions.

Plant Details

Botanical Name
Brassica oleracea var. gongylodes
Life Cycle
Biennial
Sun Requirement
6–12 hr.
Days to Germinate
6–9
Days to Maturity
60–90
Planting Depth
¼ in.
Plant Spacing
12 in.
Ideal Temperature
45–80°F
Frost Hardy
Yes

Growing Guide

When to Grow

Superschmelz is best planted in the cooler parts of the growing season. For a spring harvest, start seeds indoors 4-6 weeks before the last frost, or sow them directly in the garden 2-3 weeks before the last frost. For a fall harvest, sow seeds outdoors in mid summer, allowing about 10-13 weeks before the first frost so the bulb has time to reach full size. In mild climates, Superschmelz can even be left in the ground over winter for a late harvest. If you’re not sure how to find your first and last frost dates, consult our blog post 'Our Experts Answer Questions, Share Resources.'

How to Sow and Plant

Sow Superschmelz seeds about 1/4 inch deep in rows spaced 12-18 inches apart. Thin seedlings to stand 8-12 inches apart to give these large plants enough room to grow. If starting indoors, transplant seedlings when they are 4-6 weeks old and hardened off. Ensure that they are spaced adequately to accommodate their size.

How to Grow

Superschmelz requires consistent moisture and should be watered regularly to keep the soil evenly moist. Apply mulch to help retain moisture and suppress weeds. This variety is not a heavy feeder, but applying a balanced organic fertilizer or compost during the growing season will support healthy growth. Watch for common pests like cabbage worms and flea beetles, and use organic methods for control, such as insecticidal soap or row covers.

How to Save Seeds

  • Like its cabbage cousins, kohlrabi is a biennial and must be overwintered to produce seeds.
  • Kohlrabi is hardy down to 20 F. Those in areas with mild winters should have no issue keeping plants alive over winter.
  • In cooler regions, kohlrabi must be dug up and overwintered in sand in the root cellar. Kohlrabi stored this way should not be allowed to dry up and may need light watering while in storage.
  • Replant them after the last frost and allow them to go to seed.
  • Pick the seed pods after they are thoroughly dried and place them in a cloth bag. You will need to use a hammer or step on the stubborn pods to free the seeds.
  • Separate seeds from the chaff (leaf, pod, and stem trash) and store them in glass jars in the refrigerator.

FAQ

How large can Superschmelz kohlrabi get without becoming tough?

This variety grows very large and can reach up to 14 inches in diameter without becoming woody or tough.

Can Superschmelz kohlrabi tolerate frost?

Yes, it is frost-tolerant and can be left in the ground over winter in mild climates.

How long does Superschmelz take to mature?

It typically matures in 60-90 days, depending on growing conditions.

Browse our full range of kohlrabi seeds.

Customer reviews

4.1 / 5 16 Reviews

What gardeners are saying

  • Enormous bulbs: Grows to softball size and beyond, 11 to 28 pounds for some.

  • Tender and mild: Crisp, mild and juicy raw or cooked, even at huge size.

  • Feeds a crowd: One bulb makes several meals and keeps well in the fridge.

  • Growing tips: Germination can be spotty and plants need room; sow extra.

More to grow!

See all Kohlrabi Seeds