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Denver Rose Society Events:


Monthly Rose Information:

Thursday, September 10, 7:00 pm
Denver Rose Society Monthly Program

Companion Plants for Roses
By: Mary Kirby, DRS Consulting Rosarian and Master Gardener

Denver Botanic Gardens - Plant Society Building
1007 York Street, Denver, CO 80206
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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Consulting Rosarian Tips for September:

by Dave Ingram

  • We started the “Fall Countdown” last month by reminding that the last fertilization should be finished by August 15. This lets your roses flower in the fall, and store up energy for the long winter ahead. If you missed that date, a liquid foliar spray can give a short-term boost.

  • For most roses, like Hybrid Teas, Floribundas, modern climbers and Austin shrubs, snap off any new “basal breaks” at the base of the plant. This new growth won’t live through the winter, and just wastes energy. Let the plant use that energy to give you more flowers at the top.

  • Once temperatures cool, you will need to water less. The goal is to help the plants slow down and harden off for winter. But keep checking the soil before watering – August was pretty dry so watering in my garden was up to me, rather than la mamma nature.

  • As fall arrives, begin to deadhead beneath the flower head, rather than further down the stem. You may also leave spent flower heads on the bush (on some varieties, these may mature into hips). This helps the rose slow its growth rate as winter approaches. Fall is the season I like to cut flowers for the house with short stems, and then float them in a garden bowl or wine glass.

  • Warm days and cool nights may produce powdery mildew. Watch for the distinctive leaf curl and whitish “powder” of the fungus on newer top growth and buds. Black spot and rust are also afoot in my garden this year. So far, GreenCure sprays have held the Bad Fungus (isn’t that a rock group??) at bay. But the truce is uneasy, and this sentry is out every day scouting for trouble. (My cat Sasha hunts for grasshoppers, I hunt for fungus.)

  • Japanese beetle pressure should ease this month. Other pests may hang around. Keep in mind that most insect pests can be controlled with a spray of hose water, or a soap spray (or a cat). Any unusual damage should be correctly identified before deciding on the least invasive remedy.

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.  We need rose growers in the Rocky Mountain District (Colorado, Wyoming, Idaho, Montana, Utah and Calgary) to provide input.  Go to the RIR tab at by September 26th.  You do not have to be an ARS member to provide input.  Results will be available in the fall. 

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 newly revised 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








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Website last updated: 08/26/2015 08:11:34 AM