Coriander Slow Bolt

🧺 Sowing: In Trays vs. Direct

Coriander is best sown directly where it’s going to grow, but there are times when trays can come in handy. Here’s the breakdown:

Direct Sowing (Best method):
Coriander dislikes transplanting due to its long taproot. Disturbing the root often causes it to bolt prematurely (go to seed). Sow directly into prepared soil in rows or blocks. This suits garden beds, raised beds, or deep pots.

• Timing: Sow in early autumn through winter in warm climates, or spring and autumn in cooler zones.
• Spacing: Sow seeds 1cm deep, spacing them about 5–8cm apart, thinning as they grow.

Tray Sowing (If necessary):
If you’re starting early in the season or want to protect seedlings from pests, you can sow in deep trays or biodegradable pots—ones that let you transplant without disturbing the roots.

• Use deep modules, not shallow punnets.
• Transplant once seedlings are about 5–7cm tall, carefully and with soil intact.

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🧊 Seed Pre-Treatment

Coriander seeds benefit from a simple pre-treatment:
Gently crush the outer husk (each seed is actually two in one) and soak in warm water overnight before sowing. This helps improve germination rates, especially in cooler soil.

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🌞 Soil & Position

Soil:
Coriander prefers rich, well-draining soil with plenty of organic matter. A pH between 6.2 and 7.0 is ideal. Add compost before planting and mulch well to retain moisture and regulate temperature.

Position:

• Full sun in cooler months
• Part shade in hotter regions or over summer, as heat stress will trigger bolting.
• Coriander dislikes drying out and wind exposure—try a sheltered spot if possible.

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🌿 Care & Maintenance

Coriander grows quickly and can be productive for weeks with good care.

• Watering: Keep the soil evenly moist—not soggy. Dry soil = early bolting.
• Mulching: Mulch around the plants to keep roots cool and retain water.
• Feeding: Side dress with compost or use a mild liquid feed fortnightly during active growth.
• Succession sowing: Sow every 2–3 weeks for a continuous supply, as each planting has a relatively short leafy harvest window.

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🌸 Companion Planting Guide

Coriander is a lovely team player in the garden. It can repel pests and attract beneficial insects like hoverflies, lacewings, and parasitic wasps when in flower.

Good Companions:

• Lettuce (provides some shade)
• Carrots (similar soil needs)
• Tomatoes (repels aphids)
• Spinach and silverbeet
• Dill, anise, and basil (but avoid planting too close to avoid flavour confusion)

Avoid Planting With:

• Fennel (inhibits growth of nearby plants)

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✂️ Harvesting

You can harvest coriander at two main stages:

1. Leaf harvest:
   • Begin when the plant reaches about 10–15cm tall.
   • Pick the outer leaves regularly to encourage new growth.
   • For best flavour, harvest in the morning.
2. Seed harvest (Coriander spice):
   • Allow plants to flower and develop seed heads.
   • Once seeds turn brown and dry, cut stems and hang upside down in a paper bag to catch falling seeds.
   • Store seeds in a cool, dry place.

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🐛 Common Issues & Fixes

Issue	Cause	Fix
Bolting (early flowering)	Heat, transplant shock, dry soil	Sow in cooler weather, mulch well, water consistently.
Yellowing leaves	Overwatering, poor drainage	Improve soil drainage, ease off watering.
Aphids	Common sap-suckers	Spray with insecticidal soap, attract ladybirds, or use garlic spray.
Powdery mildew	Poor airflow, excess moisture	Space plants better, water at soil level, remove affected leaves.
Poor germination	Hard seed coat or old seed	Pre-soak seeds, use fresh viable seed, keep soil moist until sprouting.

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🌾 Seed Saving Guide

Saving coriander seed is simple, and you’ll get loads from just a few plants.

1. Let plants flower and go to seed.
   In warm weather, coriander bolts quickly—so you may only get a short leafy harvest before this stage.
2. Watch for seed maturity.
   The green seeds will dry to a tan brown on the plant. Wait until most seeds on the stem are dry before harvesting.
3. Harvest and dry:
   Cut the seed heads and hang them upside down in a paper bag in a dry, shaded area. Seeds will fall as they dry.
4. Clean and store:
   Rub gently to separate seeds from stems. Store in an airtight jar in a cool, dark place. Label with the variety and year.
5. Viability:
   Coriander seeds are viable for around 3–4 years when stored properly.

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🌻 Final Thoughts

Coriander can feel a bit fussy with its sudden urge to bolt, but once you find its rhythm in your garden, it’s such a rewarding herb. Sow in the cooler seasons, give it rich soil, and don’t skimp on watering or mulch. And remember—if it bolts early, that’s okay—it’s all part of the learning! You’ll still get flowers for pollinators and seeds to cook with or save for next season.

💚 Keep sowing in succession and treat it as a seasonal crop rather than a forever herb. That way, you’re always a few weeks away from fresh flavour in the kitchen!

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Delivery Guarantee

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