September 10, 7:00 pm
Denver Rose Society
Companion Plants for Roses
By: Mary Kirby, DRS
Consulting Rosarian and Master Gardener
Gardens - Plant Society Building
1007 York Street, Denver, CO 80206
Visitors and guests are welcome to attend.
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.
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:
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
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
Rosarian in your area.
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
Rose.org 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
Get a glimpse
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