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Time to promote dormancy in rose bushes

 

Last updated 12/10/2021 at 9:21am

Roses are still actively growing and blooming in the Fallbrook area too. Village News/Lucette Moramarco photo

Frank Brines

Consulting Rosarian (ARS)

Depending on which side of the canyon you live, weather has been relatively good for our fall roses. Most areas still haven't had temperatures anywhere near frost. Roses could still be seen actively growing and blooming in many Temecula Valley gardens during the Thanksgiving holiday. The lower nighttime temperatures will soon cool the soil and reset the roses' biological clock to slow down and go into some kind of dormancy.

Roses need a four- to six-week dormancy period during the winter months. During dormancy, the plants go through natural hormonal changes that prepare them for the next growing season, including forming buds at the base of the plant to produce new canes. Dormancy is triggered by a variety of factors. Cold temperatures (including frost) slow the plant's metabolism while cold rains chill the soil, further slowing growth rate.

You can help promote dormancy by not deadheading or pruning this month. Allow the rose "hips'' to mature so they can send hormonal signals to the plant that it's time to rest and marshal its energy for a vigorous growth spurt in the spring. Just the same, be sure to monitor your plants when daytime temperatures are warm: They still need to be kept hydrated!

Also, do not fertilize until after your major pruning in January or February. And then only after a couple inches of new growth. Speaking of fertilizer, the San Diego Rose Society is currently taking annual fertilizer orders for January delivery to have on hand when new spring growth is 2"-3" long; go to http://www.sandiegorosesociety.com/fertilizer-sale for more information.

On the topic of pruning: Some gardeners in the Temecula Valley are anxious to prune their roses in December. That's understandable because we haven't had a hard frost yet even though the average date for first frost in our area is Nov. 17. Pruning now not only prevents dormancy, but also produces tender new shoots that will most likely be killed by the next hard frost. So, bottom line: Please wait four to six weeks after the first frost to do your major "spring" pruning. In the event that there is no frost or freeze, it is typical to prune by mid-February.

I mentioned last month that the Asian "chili thrip" is spreading rapidly in the Southwest and is becoming a global threat. This pest is extremely successful and particularly resistant to conventional control methods. The chili thrip is even smaller than the western thrips we're familiar with. It works in similar ways, only more devastating and more difficult to control. It doesn't seem to have any preferences except new growth of almost any plant and blossom. Its damage resembles the effects of Roundup overspray or rose virus: severely stunted and very narrow leaves, stems, and buds. Gardeners I've spoken with use several different products to gain some control, but a regular program is necessary with applications weekly at least.

Cool, moist air promotes mildew and rust, so be watchful for these fungi. Be prepared also for spraying with a dormant spray immediately after the spring pruning in February. Read the label and be sure to buy enough to thoroughly cover the plant and garden bed. I find that a two-gallon pump sprayer with 2 gallons of mix will cover about 15 rose plants after pruning.

There is still time to order that new rose you have been dreaming about. Garden stores may still be adding to their list of orders, or go to your favorite online nursery and make your order. There are many fine new roses that you simply must have. Many are more disease resistant than in the past. Most nurseries or wholesalers no longer print catalogs, so for a list of current roses available from each, you will have to go online. Walter Andersen Nursery will soon have recently potted roses available. You can view the varieties that will be in stock by going to their website. I'm sure other nurseries will have similar information on their websites.

A few new varieties I find of interest are: At Last (floribunda, good apricot color, fragrance, disease-resistant); Bordeaux (floribunda/WineRed, large blooms, heat tolerant, disease resistant); Easy Spirit (floribunda/White, Hybrid T form, fragrance, hybridizer Tom Carruth, disease resistant, lasting form); Frida Kahlo (floribunda/Scarlet Redstriped gold, small clusters, mild fragrance, disease resistant, compact, hybridizers Christian Bedard & Tom Carruth); Gaye Hammond S (Bright Yellow with touches of orange, slight fragrance, disease resistant, bloom making machine); Parade Day (Grandiflora/Fuchsia Pink Striped White, strong fragrance, hybridizer Christian Bedard, holds color); Flowerland (Shrubby, Pink, low (1.5') growing habit, 60-65 petals, fragrant; it would be great for small spaces or en masse); Golden Iceberg (mild spicy fragrance).

For more ideas, visit TVRS' Rose Haven garden at 30592 Jedediah Smith Rd., Temecula, as well as TemeculaValleyRoseSociety.org/index.shtml. Enjoy the holidays of your choice as best you can – and spread the joy of roses!

 

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