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The most allergenic tree pollens are from birch, cypress, Japanese cedar, latex, grass, and ragweed.

Duck to navigate a little hole in an old holly hedge, where the first of several boardwalks beckons toward an allee of Cryptomeria, the Japanese cedar, that feel as towering as giant sequoias.

The wall provides enough seclusion that we can soak outside in our Japanese cedar tub, a foot away from the sidewalk, without feeling as if we’re re-creating an Esther Williams synchronized-swimming extravaganza.

Evergreen candidates include red cedars, laurels, Chindo viburnums, Japanese cedars and upright yews.

One of my most memorable gaffes in the garden was the time I sprayed a Japanese cedar with horticultural oil.