Structural Pruning for Young Trees in Central Texas

On a young tree in Central Texas, structural pruning is the one pruning job that’s for the tree instead of for you. It means building a single dominant leader — one main stem — over two to five sessions spaced every two or three years, until the tree has one. Then you stop.

I say that as somebody who sells pruning for a living. The honest version is that the role of tree pruning in maintenance is mostly cosmetic. On a mature tree you’re buying it for looks, for clearance over the driveway, or to get a dead limb out of the yard — good reasons, all of them yours. There are a few real exceptions, and young trees are the one that holds across every species I work on.

What structural pruning actually is

A young tree spends its first years sorting out which stem is going to be the top of the tree. Two things can go wrong with that: two stems race each other for the lead and neither wins, or the whole tree sets off at an angle and keeps going.

Structural pruning is the work of settling it. You pick the leader, and then you slow down its competition — subordinating the competing stem rather than taking it off. If the tree is leaning a little, you start correcting that. On a very young tree those subordination cuts get evaluated carefully, because you are making a decision about the tree’s permanent structure.

It doesn’t start the day the tree goes in the ground. A newly planted tree gets none in years one and two, and rarely anything in year three — the shaping usually begins somewhere in year three or four, and when it begins, it’s structural. Before that the tree needs water and time, not cuts.

Here is what it is not. It is not raising the canopy, and it is not opening the tree up. Raising the low limbs is the usual substitute, and it isn’t structural pruning.

What usually gets done instead

Of the expensive things I see homeowners do to their own trees, doing their own pruning is the lesser of all the evils. The two ahead of it are both lawn projects — an irrigation install that trenched through the roots, and weed and feed. Pruning is usually just being too aggressive with younger trees. People get really aggressive about raising the low limbs, thinking it’s either going to make the tree grow taller, faster — or they just have a short-term vision of wanting to be able to see underneath the tree. So you get excessive canopy removal on a young tree that’s just barely gotten established, and that can have a pretty negative effect.

And then also, they’re not doing any structural pruning. They’re raising the low limbs, but they’re not accounting for trying to make a central leader, or, if the tree happens to be leaning a little bit, trying to correct that. They’re removing foliage for all the wrong reasons.

That’s two mistakes stacked on one tree: the work that mattered didn’t happen, and a tree that was still establishing lost canopy it needed.

The term for what’s being spent is live crown ratio — how much of the trunk’s height is carrying live canopy. Raise the limbs on a young tree and you’re spending that ratio on the view under the tree. Do it a few years running and there isn’t much left to spend.

What you can safely do yourself

The tree’s age is a factor here. I’ll give you the two ends of it.

Under three years old, don’t do anything more than snip a few ends back on some low-hanging limbs. Don’t cut any entire branches off. And if you just don’t do any pruning at all, that’s probably great too.

Fifteen years or older, if you want to snip up some of the low-hanging bits — that’s what I’m talking about being fine.

In between, it’s a judgment call, and I’m not going to pretend there’s a clean line. Age isn’t the only variable anyway. What I’d say is that the cuts that decide a young tree’s structure are exactly the ones worth having somebody look at.

Timing is its own subject. If the young tree is an oak, the pruning window is worth asking about.

If your young tree has already been over-raised

Good news: over-raised young trees are typically repairable, and the repair is to stop pruning.

Young trees are like young people. They’re pretty malleable, and they adapt and get better with time. Stop pruning, give the tree a chance to recover. The next time you do some pruning, do the parts that matter and let the live crown ratio recover.

It’s worth knowing how different that is from the mature version of the same mistake. Native live oaks around here are a couple hundred years old. When one of those gets over-thinned and scalped, it doesn’t recover and turn back into the tree it was. Vigor comes back in about five to seven years; the form never does, and there’s no amount of money you can spend to buy it back. On a young tree, time is on your side and the fix is free.

Why the blue-sky test doesn’t apply to your young tree

There’s a test you can run from the ground with no tools and no vocabulary — the blue-sky test. Stand under the tree, look up, and see how much blue sky you see through the canopy. On a healthy oak you should see very little if any, and you should see some interior growth — suckers (epicormic shoots) or small branches growing off the main scaffold in the interior canopy.

That test carries two conditions, and they matter as much as the test does. It’s for the growing season, and it’s for a mature tree. Never run it on a young or newly planted tree.

A young tree hasn’t built an interior canopy yet — it doesn’t have one to be missing. And a young tree that’s had proper structural pruning is supposed to look open. Run the mature-tree test on a young tree and you’ll talk yourself into a problem that isn’t there, or into more pruning, which is the last thing that tree needs.

What else a young tree in Austin needs

A young tree needs two things an established tree doesn’t: a lot more water, straight into the root ball, and — once it’s old enough — the structural pruning above. Everything else on its list is what every tree needs — consistent irrigation, no chemical weed control in the yard, compost across the root zone, and a feeding regimen. Nothing on that second list is pruning, which is worth sitting with if you own a tree company.

Water, and a lot more of it, directly into the root ball. A young tree that isn’t established yet needs that to get through our summers, and it needs it consistently — the worst thing you can do is water it faithfully and then stop cold. How much water that takes is its own subject, and it’s worked all the way through in how to water a newly planted tree. Frequency follows the thermometer rather than the calendar — once temperatures sit in the 90s, that’s every other day through the first year. Then let the site move both the volume and the frequency, because it moves them in opposite directions. A rocky hill-country slope wants shorter waterings more often — less at a time, essentially daily through that first year and even into spring, because the ground won’t hold it. Flat, deeper soil east of town wants the reverse: longer waterings, less often. Sticking a screwdriver in the ground once a week will teach you what your own soil should feel like, which is the part no number covers.

Keep weed and feed away from it. Those weed and feeds are tree poison in a bag. A newly planted tree just got stuck in the ground and it’s trying to establish at the same time you’re poisoning it. Walk into any big-box store in the spring or the early part of the fall and the pallets are out front where you can’t miss them. People who don’t know better think they’re making a great lawn and are taking down the trees at the same time.

The compost and the feeding are tree care rather than pruning. If you’re still choosing what to plant, Tree Selection: How to Pick a Tree is the earlier decision, and it’s the one that makes everything after it easier.

Our take

Most pruning is cosmetic. Structural pruning on a young tree is the exception, and it’s also the pruning where the decision matters more than the cut. Anybody with a sharp pair of loppers can remove the limb you point at. Deciding which stem stays — that’s the part you’re actually paying for, and when a young tree gets worked on for the wrong reasons, that’s the part that gets skipped.

I’ll be straight about where that’s true and where it isn’t. On simple work — cutting dead branches out of a tree — I don’t know that we really win against an average company or a lesser company. I also don’t lose. We’re still very competitive on it. But when there are real judgment calls to make, like reduction pruning on large elms and pecans, or young trees that need structural pruning to develop a central leader, that’s the know-how category, and that’s where we really shine.

You can’t beat tree pruning with equipment. Our aerial lifts help in plenty of circumstances, but they don’t make the decision. The win here is the culture: I got my first job as a tree guy when I was sixteen, I started climbing when I was eighteen, and I’ve built a company where really everybody’s a climber and everybody knows what they’re doing. Our crews work to the ANSI A300 and Z133 standards.

If you’ve got a young tree and you’re not sure whether it’s sorting itself out or heading somewhere you’ll regret later, we’ll come look at it. See tree pruning for what the work involves, or tree planting if the tree isn’t in the ground yet. Get in touch through the contact page or call us at (512) 996-9100.