---
title: Live Crown Ratio: How Much of the Tree Is Alive
url: https://battleborntreeservice.com/glossary/live-crown-ratio/
business: Battle Born Tree Service
address: 6301 US Highway 50 East, Carson City, NV 89701
phone: 775.232.8243
hours: Office Monday-Friday 8:30 am-5:00 pm; phones answered seven days a week; 24-hour emergency service
credentials: ISA Certified Arborist WE-11728A on staff; Nevada Business License # 20131580674; fully insured
type: Tree service (removal, crane work, pruning, stump grinding, defensible space, snow removal, firewood)
---

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- [Arborist glossary](https://battleborntreeservice.com/glossary/)
- Live crown ratio

# What is live crown ratio?

Live crown ratio, or LCR, is the length of the living crown divided by the total height of the tree, usually given as a fraction or a percentage. A tall tree with a short live crown at the top has a low ratio; a tree with branches nearly to the ground has a high one.

## How it is judged

The measurement runs from the top of the tree to the lowest live branch that is part of the crown, not to a stray sprout. It gives a quick read on vigour, since the crown is the tree's food factory. A tree with a small crown has fewer leaves to feed the trunk and roots, and it often has a slender trunk that moves more in the wind.

Low ratios have different causes. Trees grown close together lose lower branches to shade, which is normal in a forest stand. A tree can also have a low ratio from heavy pruning, disease, or years of drought dieback.

## Why it matters in Northern Nevada

Pines in the Sierra foothills and around Tahoe grow in stands, and a tree left alone after neighbours are removed has a tall trunk with a small top and a lot of wind. In town, a tree that has been limbed up too far, topped, or stripped by storms carries a small crown too. A related warning sign is dieback; see [drought stress and dieback](https://battleborntreeservice.com/tree-guide/drought-stress-and-dieback/).

Keep this in mind for fire work. [Limbing up](https://battleborntreeservice.com/guides/ladder-fuels-limbing-up/) to remove ladder fuels means raising the crown, and the live crown ratio is part of how much can come off.

## What an arborist does about it

The arborist includes the ratio when judging a tree, along with trunk taper, wounds and lean. A low ratio does not mean a tree must go; it means pruning has to be gentle, because a tree with little crown has little to spare. Lifting the lowest limbs for clearance or fire safety is planned so the tree keeps enough crown to stay vigorous.

### Sources

- [International Society of Arboriculture, Trees Are Good: Pruning Mature Trees (brochure)](https://www.treesaregood.org/Portals/0/siteContent/pdf/Web%20TAG%20brochures/TAG_CBweb_Pruning%20Mature%20Trees_v3.pdf) (read October 17, 2026)

### Talk to the office

[775.232.8243](tel:775.232.8243)

| Monday to Friday | 8:30 am - 5:00 pm |
|---|---|
| Saturday and Sunday | Office closed, phones answered |

Phones answered seven days a week. 24-hour emergency service.

[Free estimate](#quote)

### Keep reading

- [Arborist glossary](https://battleborntreeservice.com/glossary/)
- [Ladder fuels and limbing up](https://battleborntreeservice.com/guides/ladder-fuels-limbing-up/)
- [Crown thinning, raising and reduction: what each means](https://battleborntreeservice.com/guides/crown-thinning-raising-reduction/)
- [Drought stress and dieback](https://battleborntreeservice.com/tree-guide/drought-stress-and-dieback/)

## See also

[Apical dominance](https://battleborntreeservice.com/glossary/apical-dominance/) [Hardiness zone](https://battleborntreeservice.com/glossary/hardiness-zone/) [Central leader](https://battleborntreeservice.com/glossary/central-leader/)