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How to Grow Stock

Matthiola incana

Half Hardy Cool Season Continuous Harvest

When to Start

Sow indoors 6 weeks before last frost, or direct sow outdoors after frost risk has passed and soil reaches 8°C.

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Growth Stages

Sow seeds
Germination ~10d
Flowering ~84d

Approximate days from start

Care Essentials

  • Light balanced feed every 2-3 weeks once established. Avoid high-nitrogen feeds which produce foliage at the expense of flowers.
  • Fragrant cottage garden favourite from the Brassica family. Prefers cool conditions and well-drained, slightly alkaline soil. Excellent cut flower with a spicy-sweet clove scent. Dislikes heat and humidity.

Companion Planting

Growing Conditions

Min. soil temperature: 8°C+
Germination temperature: 15–20°C

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Spacing & Planting

Plant spacing 30 cm
Row spacing 35 cm
Sow depth 0.3 cm
Mature height 60 cm
Mature spread 25 cm

Space 25-30 cm apart for good air circulation. Closer spacing (20 cm) encourages taller stems for cutting.

Try our spacing calculator →

Care Guide

Feeding
Light balanced feed every 2-3 weeks once established. Avoid high-nitrogen feeds which produce foliage at the expense of flowers.
Watch for
  • Cabbage white butterfly caterpillars
  • Flea beetles
  • Club root
  • Aphids
  • Grey mould in humid conditions

Growing Conditions

Min. soil temperature8°C
Germination temperature15–20°C
Base growth temperature5°C
Min. daylength to start10h
Photoperiod sensitivitylong day

Frequently Asked Questions

How far apart should I plant Stock?
Plant Stock 30cm apart with 35cm between rows.
When does Stock flower?
Stock typically flowers approximately 70 days after transplanting.
Is Stock frost hardy?
Stock is classified as Half Hardy.

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