Colorado Hardiness Zone Map Plant Maps If you want a plant that comes up every year (called a perennial) you have to pay attention to the hardiness zone you are in. After reading here, click on the link above. This will take you to a great zone map. Some plants sold in our Colorado gardening centers will have the zone marked, others will not. If the plant is marked with the name but not the zone, look the name up on the internet to find out in which zone it grows as a perennial. If the plants says it is for zones 6 and higher, know that it WON’T come up again here in the front range of Colorado. I do grow some of these plants. Some I bring in during the winter, others I just let die and buy again in the spring Point is this: know your zone. And, know that not all gardening centers mark all their plants. I learned this the hard way with lavender, learning that only a couple varieties come up every year here in Colorado.