Evergreens are an important plant to the winter landscape as they provide us with lively (or should I say alive) foliage in this lowest lit, dormant season. It is no wonder why we use them as Christmas trees.
Two Scotch Pines (Pinus sylvestris) centered in this photograph are remnants of a former windbreak of Scotch Pines — all the rest have died of pine wilt and have been removed. We planted small one-gallon sized Green Giant Arborvitaes (Thuja ‘Green Giant’) in between the pines and now they are 15 feet tall and spires of green.
Green Giant Arborvitae are a good choice of evergreens in our climate and currently have no major pest or disease issues.
Many evergreens do suffer in our climate and it is difficult to recommend a fail safe variety. The Limber Pine (Pinus flexilis) photographed here in the Perennial Garden is succumbing to dothostoma needle blight — an affliction that has made us remove most of these trees from the garden.
The Vanderwolf’s Pyramid cultivar of Limber Pine so far has been immune to the leaf blight. A healthy example near the Rock & Waterfall trolley stop shows dense, healthy needles.