How to Grow Red Curly Kale 'Roter Grünkohl' Seeds
Red Curly Kale ‘Roter Grünkohl’ is a cold-hardy leafy vegetable that produces attractive red-purple curled leaves and can be harvested over a long season.
When to Sow
Red Curly Kale ‘Roter Grünkohl’ seeds can be sown indoors from March to April or directly outdoors from April to July. They germinate best at temperatures between 10–20°C.
Sowing Method
For indoor sowing, use seed trays or small pots filled with well-draining seed compost. Sow seeds about 0.5–1 cm deep, lightly cover with soil, and water gently. Keep the soil consistently moist but not waterlogged.
Germination & Seedling Care
Seedlings usually emerge within 7–14 days. Once they sprout, place them in a bright, cool location to prevent leggy growth. When seedlings have 3–4 true leaves, transplant them outdoors after hardening off for about a week.
Planting Out
Choose a sunny to partially shaded site with fertile, well-drained soil. Space plants 40–50 cm apart, with rows about 50–60 cm apart. Firm the soil around the plants and water well after planting.
Watering & Feeding
Water regularly, especially during dry periods, and keep the area weed-free. Applying mulch helps retain moisture and suppress weeds. A light feeding with compost or balanced fertilizer mid-season can improve leaf production.
Harvesting
Red Curly Kale is cold-hardy and typically reaches harvest size in 60–80 days. Begin harvesting by picking the lower outer leaves first, allowing the center to continue producing new growth. Flavor improves after exposure to light frost.
Additional Tips
- Net young plants to protect them from cabbage butterflies and birds.
- Kale grows sweeter in cool weather and can be harvested well into winter.
- Good companion plants include onions, peas, beets, dill, and chamomile.
- Avoid planting near other brassicas in the same spot year after year to reduce disease.
- Regular harvesting encourages bushier plants and higher yields.