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To determine if a plant is sufficiently cold-hardy, the USDA created numbered zones indicating winter low temperatures; the lower the zone number the colder the winter.
September 15th — November 1st
2, 3, 4
Your largely alpine environment with long cold winters and moderate summers make a good environment for hardy spring-flowering bulbs.
After planting, apply slow release "bulb food" fertilizer on the top of the ground to supply nutrients for the second year's bloom. (Fall bulbs are already fully charged with energy for peak flowering performance in their first spring bloom season.) Do not put the fertilizer in the hole with the bulb's tender roots.
Please note: Modern bone meal often draws rodents and dogs that dig up the bulbs looking for bones!
After the ground cools or freezes, cover your beds with a lightweight mulch (pine needles, buckwheat hulls, straw, or chopped up leaves) 2 — 4 inches thick to help keep down weeds and maintain a consistently cool soil temperature.
Special Note: A very good area for growing bulbs according to Rocky Mountain authors/gardeners, Rob Proctor and Lauren Springer. They integrate lots of different kinds of bulbs into their myriad of colorful gardens in and around Denver.
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