The London Plane: Friend or Foe?

There is no tougher tree than the London Plane (Platanus x acerifolia). It is easy to transplant, grows fast in almost any soil and can tolerate more root impact than any other tree species. The London Plane can develop massive trunks with spreading crowns and live for centuries. But its success has been part of its demise. Its roots are so tough and aggressive, that it can lift sidewalks and curbs, invade sewer pipes and crack building foundations. But whose fault is that, the tree or the people who put them there?

The London Plane tree has been a popular urban tree. It was almost over planted. People mistake it for the Sycamore because, well, it looks like a Sycamore. I will dispense with a description since all arborist should recognize this tree. My purpose here is to discuss its use or maybe its misuse.
Existing trees planted years ago in tight locations are cursed today for their size and power. Alternatives are, cut them down and replace, ramp over the lift they have created or live with it. In many cases though, we can prune roots and replace walks to buy at least a few more years. Better yet, give them more room by expanding the space. Ask Kim Reich about their tolerance to root pruning if you are wondering.

Future planting may be in question though. Unfortunately, some communities have actually outlawed the planting of London Planes. This is unfortunate because London Plane trees in the right place are outstanding urban trees for all of the qualities mentioned.
The challenge is planting them where they have enough space to grow. Planting spaces should be at least 8 to 10 feet in width and consider a root barrier along the edge on the sidewalk and curb. Don’t forget about above ground space for a huge and fast growing crown. Their trunks can become huge, gnarly, grotesque or picturesque, irregular, even beautiful over time. The crown will be taller than wide but eventually very large also. So give this tree room to grow.
Cankerstain is said to be serious but I suspect it to be a bigger problem in the east. Anthracnose is a constant nuisance in the PNW but seldom deadly. Selected varieties like ‘Bloodgood’, ‘Columbia’, ’Liberty’ and others are resistant to Anthracnose so always use these when asked. Apparently some people are allergic to the tiny hairs or sawdust from these trees so don’t be surprised if that reason is offered to have a Plane tree removed. As available space is reduced in our urban areas, there will be an even greater call for smaller, shorter and narrower trees all over town. But when large areas are available, large maturing trees should be planted. Take advantage when you get a big space to plant. A London Plane cultivar is a good candidate. Use it when you want a big tree fast. But don’t curse the species if you find it in a bad spot.

As always, e-mail additional comments on this tree at jimb-ufsinc@wavecable.com.