On one day, temperatures skyrocket into the sixties, and the next, they plummet to zero.  The sun blazes away for weeks, and then suddenly hides behind a wall of grey clouds. Welcome to a Denver winter season. And with climate change, no stable temperatures or weather conditions are likely for some time to come. What's a gardener to do with this situation?  Are there ways to ensure that your yard survives the roller coaster of temperatures and precipitation? Recently, we had a chance to check in with local landscape designer, Annie Houston, of Columbine Design, Inc., a sister company[...]