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How to Grow Ornamental Kale

Brassica oleracea var. acephala

Hardy Cool Season

When to Start

Direct sow outdoors as soon as soil reaches 10°C — typically early to mid spring. Can also be started indoors 6 weeks earlier for a head start.

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Growth Stages

Sow seeds
Germination ~7d
Flowering ~70d

Approximate days from start

Care Essentials

  • Feed with a balanced liquid fertiliser fortnightly during establishment. Once colours develop, reduce feeding — excess nitrogen keeps leaves green.
  • Ornamental kale develops its spectacular colours (pink, purple, white, cream) only when temperatures drop below 10°C. Sow in summer for autumn/winter display. Extremely frost-hardy — colours intensify with cold. Not typically eaten though technically edible. Replace in spring when plants bolt.

Companion Planting

Growing Conditions

Min. soil temperature: 10°C+
Germination temperature: 15–20°C

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Spacing & Planting

Plant spacing 30 cm
Row spacing 40 cm
Sow depth 1 cm
Mature height 45 cm
Mature spread 45 cm

Space 30 cm apart for bedding displays. Excellent for autumn and winter containers where summer bedding has finished.

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Care Guide

Feeding
Feed with a balanced liquid fertiliser fortnightly during establishment. Once colours develop, reduce feeding — excess nitrogen keeps leaves green.
Watch for
  • Cabbage white butterfly caterpillars
  • Aphids
  • Slugs on young plants
  • Pigeons

Growing Conditions

Min. soil temperature10°C
Germination temperature15–20°C
Base growth temperature5°C
Min. daylength to start8h
Photoperiod sensitivityday neutral

Frequently Asked Questions

How far apart should I plant Ornamental Kale?
Plant Ornamental Kale 30cm apart with 40cm between rows.
When does Ornamental Kale flower?
Ornamental Kale typically flowers approximately 60 days after transplanting.
Is Ornamental Kale frost hardy?
Ornamental Kale is classified as Hardy.

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