Blue spruce (Picea pungens f. glauca), also called Colorado blue spruce, is a beautiful tree with blue-gray needles. Being colorful and relatively drought tolerant, it’s a favorite of many ...

Regarding the residential use of blue spruce, author and naturalist Donald Culross Peattie remarked that, “as a hedge, it is so close growing and cruelly prickly as to be boy-proof and is indeed ...

Colorado Blue Spruce trees have long been landscape favorites because of their stately shape and unusual color. Picea pungens has a symmetrical form that can grow from 30 to 60 feet tall with a 10 ...

A version of this article appears in print on Aug. 25, 2020, Section D, Page 2 of the New York edition with the headline: Odd Hues: The Method Behind The Shiny Blue Fruit Of a Viburnum Bush.