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Crop guides · WITH SPRIG

Why is lettuce bolting in a coir system?

Check cultivar, season and maturity. Bolting is a developmental response that substrate changes alone will not reverse.

Teral grower guidance · Updated 27 October 2026

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THE COCOPEAT CONNECTION

Why the root zone matters

Coir supports roots while light and temperature influence the plant’s progression toward flowering.

01 / OBSERVE

Three checks before you change anything

  1. Confirm cultivar suitability for the production season.
  2. Record crop age and whether stems elongate before planned harvest.
  3. Review heat exposure and delays in harvesting.

02 / NARROW IT DOWN

What is the clearest issue?

Choose the closest observation for a suggested next check.

Crop exceeds planned maturity

Review succession and harvesting schedules for future batches.

Bolting starts early in heat

Discuss a season-appropriate cultivar and climate strategy.

Only one batch affected

Compare seed lot, transplant age and growing conditions with adjacent batches.

03 / TAKE THE NEXT STEP

Leave with something useful

Use the affected batch’s timeline to adjust the next planting rather than expecting reversal.

Keep in mind

Do not try to stop bolting by applying a stronger fertiliser solution.

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