# Crop steering

> Crop steering adjusts irrigation timing, volume and dryback, along with climate, to push plants towards vegetative growth or generative (flowering) growth.

- Canonical: https://genetixbay.com/knowledge/glossary/crop-steering.html
- Also written: crop-steering, plant steering, generative steering, vegetative steering, steering
- Glossary category: Systems and media · Evidence: Grower practice
- Status: Draft: awaiting expert review · Updated: 2026-10-31
- Licence: CC BY-SA 4.0 (https://creativecommons.org/licenses/by-sa/4.0/), attribute "GenetixBay cannabis glossary"

Crop steering is an irrigation and climate strategy, developed in greenhouse tomato and adopted widely in commercial cannabis, that uses the plant's root-zone water status as a lever. Vegetative steering keeps the substrate wetter, with smaller [drybacks](https://genetixbay.com/knowledge/glossary/dryback.md) and frequent small irrigations, to encourage leaf and stem growth. Generative steering uses larger drybacks, higher substrate [EC](https://genetixbay.com/knowledge/glossary/ec.md) and fewer, later irrigations to push flower development.

## In practice

Growers measure substrate [water content](https://genetixbay.com/knowledge/glossary/moisture-content.md) and EC with sensors or by weighing a pot, set a first irrigation time after lights-on, deliver small "shots" until the medium is near [container capacity](https://genetixbay.com/knowledge/glossary/field-capacity.md), then let it dry back overnight by a target percentage. Typical guides quote overnight drybacks of a few percent for vegetative steering and larger ones for generative, but numbers depend on the substrate and sensor. It works best in [rockwool](https://genetixbay.com/knowledge/glossary/rockwool.md) and [coco](https://genetixbay.com/knowledge/glossary/coco-coir.md), which have fast, predictable water dynamics.

Evidence: grower and industry practice, with limited peer-reviewed cannabis trials.

## Don't confuse with

- **Drought stress**: an uncontrolled or extended dry-down; steering is precise and daily.
- **Training**: physical shaping; steering is irrigation-based.

## Related terms

[Dryback](https://genetixbay.com/knowledge/glossary/dryback.md), [Field capacity](https://genetixbay.com/knowledge/glossary/field-capacity.md), [Drain-to-waste](https://genetixbay.com/knowledge/glossary/drain-to-waste.md), [High-frequency fertigation](https://genetixbay.com/knowledge/glossary/high-frequency-fertigation.md), [Rockwool](https://genetixbay.com/knowledge/glossary/rockwool.md)

## Read more

- [Drain-to-waste drip and crop steering (generative vs vegetative dryback)](https://genetixbay.com/knowledge/systems/drain-to-waste-crop-steering.md)

## Sources

1. Stemeroff J, 2018. Irrigation management strategies for medical cannabis in controlled environments. MSc thesis, University of Guelph. http://hdl.handle.net/10214/12125