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Denver Rose Society Events:


Monthly Rose Information:

Saturday, August 8th
Denver Rose Society Rose Show

Location: Denver Botanic Gardens
Entries accepted 8:00 - 10:30 am
Judging 10:30 am to 1:30pm
Open to the public 1:30 - 5:00 pm
Visitors and guests are welcome to attend.

FREE with paid admission to the gardens

Show schedule

Information on exhibiting roses can be found on the education tab. 

Thursday, August 13, 6:30 pm
Denver Rose Society Member Meeting, Garden Tour and Potluck
See August newsletter for information on location. 

 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 August:

by Dave Ingram

In this year of unusual weather events and record rainfall amounts, it is important to get yourself out of Noah’s Ark long enough to enjoy your gardens, as well as keep a careful eye on what is happening in them. I’m surprised how well some of my roses are thriving; but I also realize all this rain may produce some issues we don’t usually see.

This year, we may see more blackspot and rust than we need to admit to the rest of the country. Watch the lower leaves of your plants; pull off infected leaves and be prepared to spray with GreenCure, Serenade or other fungicides. Higher humidity will probably mean more powdery mildew on newer leaves and buds. August and September are often our prime disease months.

Believe it or not though, you need to check for water needs! Even with some rain 11 of the past 12 days in my yard, I was surprised how dry the garden soil was, particularly beneath the leaf canopies.

As you deadhead spent flowers, check inside the plant for places you can thin out errant and unproductive growth. Sun access and good airflow throughout the plant can help the rose thrive and hold down insect pests and disease. Concentrate the growth on good canes for more flowers.

Apply your final round of fertilizers by the middle of August. You’ll get plenty of flowers this fall, and the rose will have a chance to use the nutrients, then slow down and harden off before the hard winter freezes set in. I like to water the plants the day before, then apply fertilizer and water again, to moisten organics, and move liquids down into the root zone.

As August winds down, keep an eye on more tender roses like Hybrid Teas and Floribundas. If they send out new growth from the base of the plant (known as basal breaks), that new growth will have no chance of surviving the winter, and will drain the plant of energy, even if it flowers. So snap off the basal breaks, and let the rose bloom its head off on established wood.

Japanese beetles should begin to wind down this month – until then, toss them in soapy water and let them suffer and drown. Watch for thrips – spinossad is a possible organic control, or mist insecticide only on the unopened blooms (to protect honeybees). 

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: 07/29/2015 04:30:44 PM