# My plant is too tall for my tent: what can I do?

> If your plant is too tall for the tent, bend it rather than cut it. In veg or the first two weeks of flower, supercrop or tie the tallest tops down and outward; later, bend and tie woody tops sideways. Raise or dim the light so tops get no more than about 1,200 µmol/m²/s, drop the pot off any riser, and next time flip at half the final height.

- Canonical: https://genetixbay.com/knowledge/answers/plant-too-tall-for-tent.html
- Topic: Training · Type: Troubleshooting
- Evidence: Grower practice · Status: Draft: awaiting expert review
- Full article: [LST: low-stress training](https://genetixbay.com/knowledge/training/lst.md)
- Also asked as: My plant is hitting the light | My plant is too tall in flower | I'm running out of height in my tent | How do I lower a tall cannabis plant?
- Updated: 2026-10-31 · Licence: CC BY-SA 4.0 (https://creativecommons.org/licenses/by-sa/4.0/), attribute "GenetixBay Knowledge Base (genetixbay.com/knowledge)"

## Short answer

Bend it; don't cut it. In veg or the first two weeks of flower, supercrop or tie the tallest [tops](https://genetixbay.com/knowledge/glossary/top-shelf.md) down and outward. Later, tie woody tops sideways. Raise or dim the light so the tops get no more than about 1,200 [µmol/m²/s](https://genetixbay.com/knowledge/glossary/ppfd.md), lower the pot, and next run flip at half the final height. *Grower practice*.

## Why

Most height arrives after the flip. Stems and [internodes](https://genetixbay.com/knowledge/glossary/internode.md) elongate fastest around days 5–10 of short days [1], and many cultivars finish 1.5–3 times their flip height (*Grower practice*).

Tops too close to the [light burn](https://genetixbay.com/knowledge/glossary/light-stress.md). Yield rises with light [2], but at ambient CO₂ the practical ceiling for [top colas](https://genetixbay.com/knowledge/glossary/cola.md) is about 1,200 µmol/m²/s, and [photosynthesis](https://genetixbay.com/knowledge/glossary/photosynthesis.md) falls above about 30 °C (86 °F) [3]. Heat and light stress shows as bleached tops and [foxtails](https://genetixbay.com/knowledge/glossary/foxtailing.md).

Bending keeps the cola. A supercropped stem forms a knuckle in 3–7 days and keeps growing; a cut top is gone, and topping in flower costs recovery time the plant doesn't have. The house endorses [supercropping](https://genetixbay.com/knowledge/glossary/supercropping.md): the founder snaps stems all the time.

## The numbers

| Stage | Best fix | Notes |
|---|---|---|
| Veg | [LST](https://genetixbay.com/knowledge/glossary/lst.md), topping, supercropping | Plenty of time to recover |
| Flower weeks 1–2 | Supercrop, tie down, tuck under a net | Stems still green |
| Flower week 3+ | Tie tops sideways; stakes | Woody stems crease |
| Any time | Raise or dim light; remove pot risers | Measure PPFD at tops |
| Top-cola PPFD limit, ambient CO₂ | About 1,200 µmol/m²/s | Measure, don't guess |
| [Canopy temperature](https://genetixbay.com/knowledge/glossary/leaf-temperature.md) | Under 30 °C (86 °F) | 22–26 °C ideal in flower |
| Flip height | About half the usable height | [Stretch](https://genetixbay.com/knowledge/glossary/stretch.md) 1.5–3× |

## What to do

1. Measure PPFD and temperature at the tallest top.
2. Raise the light to the ceiling or dim it until the tops are under about 1,200 µmol/m²/s.
3. Take the pot off any riser or saucer stack.
4. Supercrop green tops 5–15 cm below the tip, or tie woody tops sideways to the pot rim.
5. Next run, flip at half the final height and train during veg.

## Common mistakes

- Cutting the main cola in flower.
- Leaving tops touching or almost touching the fixture.
- Bending woody stems sharply in late flower.
- Flipping a plant already two-thirds of the tent height.

## Related

- Full article: [LST: low-stress training](https://genetixbay.com/knowledge/training/lst.md)
- Answers: [when to stop training](https://genetixbay.com/knowledge/answers/when-to-stop-training.md) · [how tall plants get indoors](https://genetixbay.com/knowledge/answers/how-tall-do-plants-get-indoors.md)
- Training: [supercropping](https://genetixbay.com/knowledge/training/hst-supercropping.md) · [SCROG](https://genetixbay.com/knowledge/training/scrog.md)
- Terms: [stretch](https://genetixbay.com/knowledge/glossary/stretch.md) · [supercropping](https://genetixbay.com/knowledge/glossary/supercropping.md)

## Follow-up questions

**How close can buds be to an LED?** Keep buds far enough from an LED that the top colas receive no more than about 1,200 µmol/m²/s at ambient CO₂, and keep canopy temperature under about 30 °C (86 °F). The safe distance depends on the fixture, so measure PPFD at the tallest tops rather than relying on a fixed distance. Bleached, yellow-white top bracts mean the light is too close.

**Can I cut the top off a plant in flower?** Don't cut the top off a plant in flower. Topping needs 3–7 days to recover, which comes straight out of bud time, and in flower you lose the main cola outright. Bend it instead: supercrop green stems in the first two weeks, or tie woody tops sideways later. Cutting is a last resort only if a cola is already burning.

**How much will my plant stretch after the flip?** A cannabis plant commonly stretches about 1.5 to 3 times its height in the first two to three weeks after switching to 12/12, with elongation fastest around days 5–10. The amount depends heavily on cultivar. Plan for it by flipping at about half the final height your space allows, minus the room the light and its safe distance need.

## Sources

1. Alter H, Sade Y, Sood A, et al. 2024. Inflorescence development in female cannabis plants is mediated by photoperiod and gibberellin. Horticulture Research 11(11):uhae245. https://doi.org/10.1093/hr/uhae245
2. Rodriguez-Morrison V, Llewellyn D, Zheng Y, 2021. Cannabis yield, potency, and leaf photosynthesis respond differently to increasing light levels in an indoor environment. Frontiers in Plant Science 12:646020. https://doi.org/10.3389/fpls.2021.646020
3. Chandra S, Lata H, Khan IA, ElSohly MA, 2008. Photosynthetic response of Cannabis sativa L. to variations in PPFD, temperature and CO2. Physiology and Molecular Biology of Plants 14(4):299–306. https://doi.org/10.1007/s12298-008-0027-x