Blue spruce trees

Question

What kind of fertilizer should be used on blue spruce

Answer 1

Typically, what you would do instead of fertilizer, would be to mulch the tree with organic matter, or compost. They don't, generally, need a heavy fertilizer. Here is an article with more information: https://www.gardeningknowhow.com/ornamental/trees/colorado-blue-spruce/care-for-colorado-spruce.htm