IMG 2104When planting a shade tree, most of us imagine that it will grow up into a big majestic specimen, one that casts its friendly shadow across the yard and maybe even holds a swing for the kids. Nobody imagines a chopped and mangled thing. No-one starts out planning to cut the head off the tree they are so tenderly setting into the ground.

IMG 1990If you don’t want to doom a favorite tree, there’s one popular landscape feature you really should avoid: a raised bed built all around and partway up the trunk of that tree. It matters not what you plant in such a bed – flowers, ferns, shrubs or nothing at all. The effect will be the same: moist, airless soil against the trunk will rot the bark, which will invite insects and then rodents, which will further damage the bark, and soon the tree will be completely girdled so nutrients can no longer get drawn up to the twigs and leaves. And that’s it: the end of your tree.

IMG 0005Mosses, bearberry, Canada mayflower and thyme.This landscape contains no lawn, and instead features a mosaic of ground-hugging plants, stepstones, and pea-stone paths of varying widths, meandering like a lazy river between islands and drifts of taller, flowering plants.

Created on a bare, sandy plateau that had been built out from a high, west-facing hillside in the Berkshire foothills of Massachusetts, the new landscape is surrounded by an old pine/hemlock/oak forest. It contains 37 plant species that were chosen for their ability to thrive in the site's dry soil, strong winds and hot afternoon sun, and to be a natural extension of the enclosing woodland. Almost 90% of the plants are native species, and 70% are locally indigenous.They include:

DSC 0309Pretty, but impractical in the long run.If you need to build a fence anywhere near a tree, please keep in mind one simple fact: trees grow. Not just taller. Not just fluffier with new leaves and branches. Every year, trees add a layer of new growth all around their trunks, just beneath the bark. This layer might be skinny or thick but, whatever its dimension, the new growth expands the diameter of the trunk outward in every direction for the entire height of the tree, and even at the base flare. So, what?

images-1When we plant non-native species in our gardens and yards, these plants have tremendous potential to cause unexpected harm. Here's a story about a big one that affects us all.

From the New York Times, May 9, 2013

AVON PARK, Fla.

"Florida’s citrus industry is grappling with the most serious threat in its history: a bacterial disease with no cure that has infected all 32 of the state’s citrus-growing counties.

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