A shade tree is the highest-value plant decision anybody makes on a property, and it is the one with the longest tail. Everything else in a yard can be changed in a weekend or a season. A tree planted this spring is making its case in 2060, and where it goes is a choice somebody lives with for decades — usually somebody who was not there when it was planted.
It is also the only thing in this catalog that measurably changes how a house works. A mature canopy on the west and southwest side takes the afternoon sun off the wall and the windows in July, and that shows up on a power bill rather than only in a photograph. East shade is pleasant. West shade is functional, and it is worth deciding where a tree goes on that basis before deciding which tree it is.
Here is what we plant.
Mature size is the entire game
Nearly every serious problem with a shade tree traces back to the same thing: it was planted where it fit at the time. Fifteen or twenty years later the consequences arrive all at once, and they are expensive.
Before a shade tree goes in the ground, four things get measured:
- Overhead. A power line means a shade tree is the wrong plant. The utility will eventually top it, and a topped shade tree is permanently ruined — structurally weakened and ugly for the rest of its life. Under wires, plant an ornamental.
- Underground. Sewer laterals, septic tanks and leach fields. Cottonwood, willow and silver maple are the classic offenders here — their roots find a joint in a line and grow into it, and the repair bill dwarfs what the tree cost.
- Distance from the house. Roughly half the mature canopy width from the foundation, minimum. Closer than that and you are pruning it off the roof every few years.
- Drives and walks. Surface roots lift concrete. It is slow and it is not repairable without taking the tree or the slab.
Fast growth is a trade, and here so is the species list
Cottonwood, willow, boxelder and silver maple grow quickly, which is exactly why people plant them. They also make weak, low-density wood, they tend to be shorter-lived, and they are the trees we get called about after a wind event with a limb through something. That does not make them the wrong choice — a windbreak on acreage, a riparian corner, a fast screen while something slower fills in — but they get chosen knowingly, and with a bit of room around them.
And the soil narrows the list further. Alkaline ground here locks up iron, and several of the most-requested shade trees show it badly — silver and red maple, birch, pin oak. Those go yellow between green veins, decline over years, and no amount of feeding fixes it. There are better choices that want to be here, and they are on the list above.
The detail that kills more young trees than anything else
Planting depth. A tree set too deep, with the root flare buried under soil or mulch, declines slowly for five or ten years and nobody connects the two. The flare — where the trunk widens into the roots — belongs at or slightly above finished grade, visible. If you cannot see where the trunk widens, it is too deep. It is the most common installation error in the trade and it is entirely avoidable.
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