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Denver Rose Society Events:


Monthly Rose Information:

May 7 (Saturday) - New Date
Denver Rose Society Rose Pruning Workshop

Location: J
efferson County Detention Center
200 Jefferson County Parkway, Golden, CO 80401

 9:30 am - 12:30 pm
Open to the public


May 25 (Wednesday)
Denver Rose Society Monthly Program

Program: “How iPhotography can Capture Your Garden”
Speaker: Joni Goodwin, photographer
Denver Botanic Gardens - Plant Society Building
1007 York Street, Denver, CO 80206
Time: 7:00pm

Visitors and guests are welcome to attend.



 Join the Denver Rose Society for only $15

All Denver Rose Society members receive

  • The Rose Window newsletter (Feb.-Nov.)

  • Discount on Mile-Hi Rose Feed.

  • Option to purchase the educational booklet Growing Roses in Colorado for the wholesale price.

New members receive a complimentary 4-month trial membership to the American Rose Society.

Membership levels:

  • Individual E-newsletter membership dues - $20 per calendar year

  • Individual Plus E-newsletter membership dues - $20 for first member plus $5 for each adult, household member per calendar year

  • Individual hardcopy newsletter via USPS membership dues - $25 per calendar year

  • Individual Plus hardcopy newsletter via USPS membership dues - $25 for first member plus $5 for each adult, household member per calendar year

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The book, Growing Roses in Colorado, published by the Denver Rose Society is a "must have" for those who want to grow beautiful roses successfully.  Get a glimpse inside the Growing Roses in Colorado.  Available at area garden retailers and gift shops. For wholesale inquiries please contact Betty Cahill at

Retail locations that sell the GRIC book




Consulting Rosarian Tips for May

by Barb Kemp

Roses should be showing lots of new growth after the April snows. First on the list of May tasks are pruning and cleaning rose beds and then fertilizing. If you had to shovel prune roses, then the purchase of new container roses from a local garden center might be on your list too. By the end of May or before, you might meet up with aphids. If you purchased any bare root roses, they should be planted by now.

Pruning — Sharp tools make nice clean cuts and allow for more enjoyable pruning. Are your shears sharp, oiled, and properly aligned? Long-handled loppers will give you more leverage for cutting larger, thicker canes. A folding pruning saw will work on canes that are too large for the loppers. Keep pruning shears clean by applying rubbing alcohol or make a solution of 1-part household bleach to 9-parts water. After cleaning is finished, rub a thin coat of oil on the blades and working parts to prevent rust. When pruning is completed, clean up beds and remove all debris. Don’t forget to seal canes with Elmer’s glue (not school glue) or colored nail polish.

Planting — Choose an area that gets at least 6 hours of sun daily with plenty of air circulation and space around the plant with good drainage. Roses should not compete with other shrubs or trees for nutrients. Container roses are grown in a greenhouse environment. Before planting, they need to be hardened-off or acclimated to outdoor temperatures by placing them in a protected area for a few days. The danger of frost should be over by May 15.

  • Container Roses: Dimensions for digging the hole are 18 to 24 inches across and 14 to 18 inches deep. To determine the soil level, place potted rose in the hole and lay a stick or handle of a tool across the hole. Grafted roses should be 1 to 3 or even 4 inches below the soil level; the branching point of own root roses should be 1 to 2 inches below the soil level. If the rose was purchased in a cardboard or plastic container, remove the container before planting. Water well and begin to backfill. Using your hands, gently firm the soil; do not tamp the soil down with your feet as it will destroy the soil structure. Monitor the moisture level around the bush to avoid dehydration from sun and wind.

  • Transplanting Roses: When shoveling out a rose, can another rose be planted in the same hole? Yes. After the rose is removed, check for roots that were left behind. Enlarging the hole will uncover additional roots, rocks, or other debris. If the previous rose was doing poorly in that location, perhaps a soil test is needed. Amend soil before placing the new rose in the hole. Try to include as much of the root ball as possible. If soil falls away from the roots, then plant it as a bare root rose. The best time to transplant established roses is when the soil is workable in March and April. Transplanting can be done during warmer temperatures, but the prep work (watering rose the day before, digging the hole, and amending soil) should be completed before moving the rose. Frequent watering is recommended afterwards until the rose has taken hold and there are no wilting leaves.

Fertilizing — The first application of fertilizer is in early May with continued applications every 4 to 6 weeks afterwards. The last fertilization is in mid-August. Roses will need to be watered the day before to hydrate roots and then watered afterwards. There are several types of liquid and organic fertilizers. Read application instructions to ensure that the correct amount is given and remember that miniature roses require less than the regular amount of other roses. If the garden center has not added fertilizer to their container roses, then organic fertilizer like Mile-Hi Rose Feed can be added when planting.

Watering — When bushes begin to leaf out, increase water cycles and apply mulch to keep plants cool.

Insects/Pests — As warmer temperatures increase, watch for pests like aphids that can be controlled by squishing or with strong water sprays.

For rose questions, contact a Consulting Rosarian in your area.

2015 Roses in Review

Every year, the American Rose Society conducts a survey of roses and how they grow in gardens around the nation.  The national results will be published in a future edition of the American Rose Society magazine.  The results for the Rocky Mountain District (Colorado, Idaho, Montana, Utah and Wyoming) are available now!  The first file contains the results sorted by variety, classification, garden rating and exhibition rating.  The second file contains the comments provided by the reviewers.   










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