Pruning a monkey puzzle tree (Araucaria araucana) is mostly about removing dead, damaged, or diseased branches and maintaining a safe structure. These ancient, striking conifers naturally grow in a symmetrical, open pattern and rarely need corrective pruning. When you do prune, the goal is to keep the tree healthy and avoid creating large wounds that heal slowly. Because monkey puzzle trees have a single dominant trunk and whorled branches, heavy pruning can permanently disfigure them. This guide covers what you need, the steps to follow, common mistakes, troubleshooting, and answers to frequent questions.
What You’ll Need
- Clean, sharp pruning shears (for branches up to about half an inch thick)
- Loppers (for branches up to about two inches thick)
- A pruning saw (for larger branches)
- Rubbing alcohol or a disinfectant wipe to clean tools between cuts
- Protective gloves (the leaves are sharp and stiff)
- Safety glasses or goggles
- A sturdy ladder if you need to reach higher branches (or consider hiring a professional for tall trees)
- A bucket or tarp for collecting pruned branches
Step-by-Step
- Assess the tree. Walk around the tree and identify branches that are dead, broken, diseased, or rubbing against each other. Also look for branches that hang low over walkways or structures. Monkey puzzle trees rarely need thinning, so only remove what is necessary.
- Choose the right time. Prune in late winter or early spring before new growth begins. This minimizes stress and gives the tree time to heal before the growing season. Avoid pruning in wet weather, which can spread fungal spores.
- Clean your tools. Wipe the blades of your shears, loppers, or saw with rubbing alcohol to prevent spreading disease. Clean again between cuts if you are removing diseased wood.
- Remove dead or damaged branches first. Cut back to the branch collar (the swollen area where the branch meets the trunk) or to a lateral branch. For dead branches, you can cut flush with the trunk, but for live branches, always cut just outside the collar without leaving a stub.
- Cut at the right angle. For smaller branches, make a clean, angled cut just above a bud or lateral branch. For larger branches, use the three-cut method: first, make an undercut about a foot from the trunk (one-third of the way through), then a top cut a few inches further out, and finally cut the remaining stub at the collar. This prevents the bark from tearing.
- Remove lower branches if needed. If you want to raise the canopy for clearance, remove the lowest branches gradually, one or two per year, to avoid stressing the tree. Never remove more than a quarter of the live canopy in one season.
- Shape only lightly. If a branch is growing awkwardly, you can shorten it by cutting back to a side branch that is pointing in the desired direction. But avoid topping the tree or cutting the central leader, as this ruins the natural form and can lead to decay.
- Dispose of pruned material. Collect all branches and needles. Do not compost diseased wood; dispose of it in yard waste or burn it (if local regulations allow).
- Clean up and inspect. After pruning, clean your tools again and check that you have not left any torn bark or stubs. Minor wounds will heal on their own; do not apply paint or sealant unless a professional recommends it for a specific issue.
Common Mistakes
- Pruning too heavily. Monkey puzzle trees do not regrow from old wood easily. Removing too many live branches can cause dieback and leave permanent bare patches.
- Cutting the top or central leader. This destroys the tree’s symmetrical shape and often leads to multiple weak leaders or decay.
- Leaving stubs. Cutting too far from the trunk leaves a stub that cannot heal properly and invites disease.
- Pruning in the wrong season. Pruning in late summer or fall can stimulate new growth that will be killed by frost, or leave the tree vulnerable to pests.
- Using dull tools. Dull blades crush the wood, making it harder for the tree to seal the wound.
- Ignoring safety. Branches are stiff and heavy; dropping them on yourself or a ladder is a real hazard.
Tips
- If you are unsure about a branch, leave it for another year. You can always remove it later, but you cannot put it back.
- Wear thick leather gloves—the needle-like leaves are sharp enough to pierce skin.
- For tall trees, consider hiring a certified arborist. Climbing a monkey puzzle tree is dangerous due to the sharp foliage and brittle branches.
- If you are pruning for aesthetic reasons, remember that the natural, open form is part of the tree’s charm. Less is more.
- After pruning, water the tree deeply if the soil is dry, but do not fertilize immediately—you want to encourage healing, not a flush of new growth.
Troubleshooting
The tree looks lopsided after pruning. This is usually because you removed too much from one side. You cannot fix it by pruning the other side; instead, wait a year or two and selectively shorten a few branches on the fuller side to balance the silhouette. In most cases, the tree will fill in over time.
Branches are weeping or turning brown at the tips. This may indicate a fungal issue or root stress. Ensure the tree has good drainage and is not overwatered. Prune out the affected branches, disinfecting your tools between cuts. If the problem spreads, consult a local arborist or extension service.
Sap is oozing from a cut. Some sap flow is normal for conifers. If it continues heavily, the wound may be too large or the cut may be in the wrong place. Keep the area clean and monitor for signs of decay. Do not apply wound dressings unless a professional advises it.
The central leader broke. If the top of the tree snaps, you may need to select a strong lateral branch below the break and train it upward by staking it gently. This is a delicate operation; consider hiring an arborist, as improper training can lead to permanent deformity.
You accidentally cut a live branch that wasn’t meant to be removed. There is no way to reattach it. Clean the cut and let the tree heal. The wound may take several years to callus over. Do not try to graft it back on.
Frequently Asked Questions
Q: When is the best time to prune a monkey puzzle tree?
A: Late winter to early spring, just before new growth starts. This gives the tree time to heal with minimal stress.
Q: Can I prune a monkey puzzle tree to keep it small?
A: No. Pruning will not keep it small; it will just disfigure the tree. These trees grow tall and wide naturally, and you should plant them with enough space.
Q: Do I need to seal the cut after pruning?
A: Generally, no. Conifers seal wounds on their own, and applying sealant can trap moisture and encourage decay. Only use a sealant if a professional advises it for a specific situation.
Q: How much can I prune in one year?
A: Remove no more than a quarter of the live foliage in a single season. For a monkey puzzle, even that is a lot—usually you only need to remove dead or damaged branches.
Q: Why are the lower branches dying?
A: It is normal for lower branches to die as the tree matures and the canopy shades them. You can remove them cleanly. If many branches die at once, check for root problems or disease.
Q: Can I prune the roots to control growth?
A: Root pruning is not recommended for monkey puzzle trees. It can weaken the tree and make it more susceptible to windthrow. Instead, choose a planting site with ample room.