Understanding Arboriculture: A Guide to Tree Removal vs. Tree Trimming
Trimming improves trees’ health, shape, and structure, protects against pests and diseases, and stops dead, diseased, or broken branches from becoming a safety threat. Tree removal prevents unstable, weakened trees from damaging property and power lines and injuring surrounding plants and people.
Here’s an arborist’s guide to tree trimming and removal, packed with tips to help you know which of these common care practices is right for your needs.
Understanding Tree Biology
When looking after our trees, we must understand how they grow, stay healthy, and respond to care practices like trimming.
Quick Guide to Tree Growth and Health
All trees share three main parts: roots, trunk, and crown (branches, leaves, flowers, and fruit). However, tree species have individual growth patterns that result in unique structures and forms.
Healthy trees keep growing and have well-shaped crowns with lush leaves. Their trunks and branches show new growth every year. More signs of tree health include:
- A symmetrically shaped crown
- Dark-green leaves or needles (unless they’re supposed to be purple or red)
- Full flowering and fruit production
Significance of Regular Tree Care for Longevity
While trees growing in the wild are good at looking after themselves, those in urban environments need some help. You can boost your trees’ wellness by enriching their soil, watering them, and trimming them according to their needs. Well-cared-for trees grow healthily, resist diseases and pests, and have strong branches.
Tree Trimming
What is Tree Trimming?
Tree trimming is the strategic and skillful removal of branches to achieve one or several goals.
Here are 10 reasons to trim your trees:
- Clear dead and damaged branches
- Maximize longevity
- Improve structure and shape
- Let light and air into the crown or onto the ground below the tree
- Prevent pest attacks and diseases
- Give new trees a strong foundation
- Make the area around the tree safe
- Speed growth and fruit production
- Enhance trees’ aesthetic value
- Control overgrowth
Essential Tools Used in Tree Trimming
| Tool | What it is | What to use it for |
|---|---|---|
| Hand pruner | A compact cutter available in anvil and bypass styles | Twigs and branches up to ½ an inch in diameter |
| Lopping shears | Larger versions of pruners with bigger blades and longer handles | Branches with a diameter up to 1½ inches |
| Pruning saw | A long, narrow blade with teeth designed for pruning trees | Branches bigger than 1½ inches in diameter |
| Pole saw | A saw with a long handle or pole extension | Branches you can’t reach |
The Benefits of Tree Trimming
- Enhancing Aesthetic Appeal — Trimming can improve trees’ natural shape and encourage them to flower.
- Preventing Tree Diseases and Pests — Insects and diseases are attracted to dead or damaged branches. Removing these branches protects the tree against threats.
- Increasing Sun Exposure and Air Circulation — Strategically removing branches from trees’ crowns allows light in and encourages airflow to lower disease risk.
When Should You Consider Tree Trimming?
Seasonal Guide for Tree Trimming
| Season | Guidance |
|---|---|
| Winter | Best season to trim to encourage healthy spring growth. Also right for trees that flower in summer or fall. |
| Spring | Trees that flower in spring do best when trimmed just after their flowers fade. |
| Summer | Trim to control the size of trees. |
| Fall | Avoid trimming — tree wounds take longer to heal and the risk of fungal infection is higher. |
Indicators of Required Tree Trimming
- Dead, damaged, or diseased branches
- Weakly attached branches
- Branches growing inward or rubbing against each other
- Branches interfering with activities below
- Overgrowth
- Branches growing toward power lines or buildings
- An asymmetrical crown
- Sprouts at the bottom of the trunk
DIY Tips for Small Trees
Do:
- Only trim when you have a reason to — safety, health, or aesthetics
- Ensure your tools are always sharp and sterilized
- Remove dead, damaged, and diseased branches as soon as you notice them
- Stick to removing only 5–20% of a mature tree’s living foliage in one go
- Keep your cuts as small as possible
Don’t:
- Over-trim, especially when trees are stressed
- Trim trees more than five times a year (unless removing dead, diseased, or damaged branches)
- Chop off a mass from the top of a tree’s crown (topping)
Tree Removal
What is Tree Removal?
Tree removal involves taking out an entire tree, including its roots, or removing only its branches, leaving a stump behind. Special equipment and techniques cut a tree down to a stump or remove the entire tree from crown to roots.
Essential Tools for Tree Removal
- Cutting tools: lopping shears, pruning saws, pole saws, chainsaws
- Climbing equipment: ropes, belts, harnesses, lanyards, slings, carabiners
- Safety equipment: hard hat, gloves, non-slip boots, leg protection, safety goggles, face shield, hearing protection
When Should You Consider Tree Removal?
Identifying Dead or Dying Trees
- Lacking leaves when all other trees have full foliage
- Damaged trunk stripped of bark
- Fungi feeding off a sickly tree or on the surrounding ground
- Wide vertical cracks in the tree trunk
To check if a tree is dead, scratch the underside of branches in several areas. The tree is likely dead if you don’t see any green.
Recognizing Tree Diseases and Pest Infestations
Signs of disease:
- Slowed growth
- Noticeable twig and branch dieback
- Undersized leaves or needles
- Leaf discoloration or early drop
- Excessive seeds or cones
- Mushrooms, conks, or shelf-like structures
Signs of pests:
- Damaged, discolored, or abnormally sized leaves
- Holes in leaves or trunk with frass
- Suddenly thinning foliage
- Lifting roots
Tree Trimming vs. Tree Removal: Making the Right Decision
| Salvageable Trees | Removal Recommended |
|---|---|
| Less than 50% of the tree is damaged | More than 50% of the tree is damaged |
| Severe damage covers less than 25% of trunk circumference | More than 25% of trunk circumference is severely damaged |
| Less than a third of the trunk is hollow or rotten | A third or more of the trunk is hollow or rotten |
| Less than 25% of large branches are damaged | More than 25% of large branches are damaged |
| The tree has a slight lean | The tree leans more than 15% from vertical |
| Less than 50% of the root system is damaged | More than 50% of the root system is damaged |
Hiring Tree Service Professionals
Hire a certified arborist to remove trees, trim large trees, or advise you when you need help caring for your trees properly.
Questions to Ask Before Hiring
- Are you certified? What qualifications do you hold?
- What is your tree care experience?
- Are you insured against personal injury and property damage?
- Do you comply with local regulations?
- Do you use ethical, industry-accepted standards and practices?
- Do you have references from previous tree trimming and removal jobs?
- Could you give me a written detailed project estimate?
Frequently Asked Questions
What are the risks of DIY tree trimming and removal? DIY tree trimming and removal risks include tree harm, accidents, and property or surrounding vegetation damage.
How often should I schedule professional tree maintenance? Schedule professional tree maintenance around your trees’ needs. Trees’ species, age, and health status influence how much care they require. Ask a certified arborist to recommend a personalized maintenance schedule.
What is the best time of year for tree trimming or removal? Late winter or early spring are the best times for tree trimming and removal.
How do I identify diseased or dying trees? Signs include sparse foliage, discolored or undersized leaves, stripped bark on trunks, large vertical trunk cracks, slow growth, holes in the trunk or leaves, and mushrooms or shelf-like structures on or close to the tree.
Contact Firefighter Tree Services at 650-454-0373 for expert guidance on whether your tree needs trimming or removal.