Rosarian Tips for November:
If there are any
signs of blackspot or powdery mildew lingering in your rose garden, sanitize by removing
diseased leaves to eliminate the potential of harboring spores over
the winter. When roses have gone dormant, you may use a fungicide spray to get
rid of diseases by spraying the rose bush, around the surface area of the rose,
and the surrounding areas that could harbor diseases.
Winter protection helps to shield roses from freezing,
from the drying winter winds, and to lessen the effects of the freeze/thaw
cycles as spring emerges. When roses are exposed to pro-longed periods of low
temperatures (23 degrees or lower), they go into a state of dormancy. Roses with
southern exposure or ones planted against a brick wall are less vulnerable and
would require minimal protection. Shrub roses and own root roses are hardier and
can do well with minimal-to-no winterizing, while rose varieties such as hybrid
teas, some modern roses, or minis will benefit from winter protection.
Once we’ve had a few nights with temps in the teens or
20s, but before single digits, you can protect your semi-hardy roses by using a
few shovels of dirt to cover the base of the rose, especially if the graft is
exposed. If your roses are exposed to the elements, a rose collar can be
purchased or you can make one using wire and place about 12 to18 inches of mulch
inside. When applying winter mulch, be sure that air and water can get down to
the roots, so apply loosely—do not pack the mulch. After roses become dormant,
evaluate rose canes. If they are taller than 3 feet, you may want to consider
cutting them back to prevent breakage from heavy snows.
On warm days during a dry winter, water roses midday
before another cold spell to ensure that the roots are hydrated. Roots suffer
more in dry soil than in wet soil.
For rose questions, contact
Rosarian in your area.
Photo courtesy of
Joan Franson, our beloved longtime member who has contributed
immeasurably through her time and talents to the Denver Rose Society
over the years, passed away on October 17, 2014. We know
that you share in our grief but also in celebrating her
extraordinary life and accomplishments.
Read about Joan
This article, written by Susan
Clotfelter, was printed in the February 15th, 2014 edition of
The Denver Post.
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
inside 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
Roses in Review Results
Every year, the American Rose Society
conducts a survey of roses and how they grow in garden around the
nation. The results for the Rocky Mountain District are in.
See what rose growers in Colorado, Wyoming, Idaho, Montana and Utah
have to say about recent introductions. Use this information
to help you decide which roses to plant next year.