Consulting Rosarian Tip of the Month



Continue Integrated Pest Management (IPM), and monitor for pests and diseases. Do not spray when temperatures are over 85 degrees. Powdery mildew may begin to reappear in the last half of the month. If it appears in spite of preventative sprays, an eradicator spray will be needed. Apply final fertilizers by the middle of the month. If vigorous basal growth appears in the last part of this month, it is wise to remove these new shoots which may not harden off before an early damaging frost. Check with a local Consulting Rosarian.


The choice fertilizer recommended by the Denver Rose Society is Mile-Hi Rose Feed, which is available at your favorite local independent retailer. During the summer heat apply additional mulch to an average of 2 – 3 inches deep. This will conserve water and keep the soil cooler. Keep mulch an inch or two from the base of the shrub. Cut spent blooms (aka dead heading) properly to promote continued flowering. Enjoy the flowers!!


Check out Dave Ingram’s May “Getting Started with Roses Volume V (June through August)” for additional timely tips.


Growing Roses in Colorado (GRIC) has a wealth of information on care of roses, find the book at area garden centers, gift stores or order from this website.


Consulting Rosarians (CRs) are available to assist you with your questions throughout the year. Contact them by typing in your question on our Contact Page.  A list of CRs is on the DRS website – Denver Rose Society.


Please consider joining our society, we’d love to meet you. You may join on line or send in a paper copy. Paper renewal for existing members or new members who prefer to mail in the form –  Membership Mail In Form. Memberships run one year from the joining date.


To meet other friendly rose devotees, please join us for our next monthly meeting –  the September meeting is September 13, 2018 at 7:00 pm at the Plant Society Building at Denver Botanic Gardens.  Visitors and guests are always welcome!




The Denver Rose Society's definitive guide to growing beautiful roses in Colorado
Click here to purchase our definitive guide to growing beautiful roses in Colorado.


Click here to join the Denver Rose Society.


Click here for our list of Consulting Rosarians.