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It's time to start pruning; how to cue bushes to take a winter nap
These Rainbow Sunblaze roses are in full bloom on Dec. 27, bright spots on a rainy winter day. Debbie Arrington
It’s almost New Year’s Day and my roses are still (stubbornly) in bloom. Blame our mild winter weather.
Near-freezing temperatures cue roses (and other shrubs and trees) to drop their leaves and enter winter dormancy. But when temperatures stay above normal, these deciduous plants keep on growing and producing more flowers. They feel like it’s still October, not almost January.
My roses, it seems, are pretty accurate predictors of temperature. This has been a relatively warm December in Sacramento.
Through Tuesday, December has averaged more than 3 degrees warmer than our average median (50.7 degrees vs. 47.4 average), according to the National Weather Service. And our December daytime highs have been almost 5 degrees above normal (61 degrees vs. 56.2 average).
Meanwhile, our nightly lows have been warm, too (40.3 degrees vs. 38.6 average). Although we’ve flirted with frost, Downtown Sacramento has not recorded one night under 32 degrees so far this month.
We can’t do anything about the weather. But we can go ahead and prune our roses – they need it. Consider pruning as telling your roses to take a forced vacation; they need to take a winter break.
Pruning is crucial for healthy rose bushes. It’s a chance to rid the plant of fungal-bearing foliage and eliminate diseased canes. It improves air flow in and around the bush (another way to cut down on fungal disease) and also keeps bushes from overwhelming their space.
Normal pruning season in Sacramento runs from early- to mid-December through early February. By late February, bushes will be pushing out lots of new growth. (And with this warmth, bushes already are sprouting new growth.)
What happens if you don’t prune? New growth will sprout out of the top of the old growth. If your bushes are already 5 or 6 feet tall, they’ll tower overhead by spring – and just keep going.
Pruning is crucial to disease control. Old foliage (on or off the bush) may harbor fungal spores that will immediately infect healthy new growth (especially if there’s moisture in the air – like today). And in an effort to shed damaged foliage, the bush may shed all its leaves next spring – when the bush needs those leaves to produce energy – and roses.
Speaking of rain, recent storms have really brought out botrytis (gray mold). It turns rose buds into brown yucky mush. Before pruning, pluck off infected blooms and petals and discard.
Here are more tips from master rosarian Baldo Villegas on how to prepare for pruning:
* Check your irrigation system to make sure that all roses get adequate water. Decrease or stop watering once rain starts.
* Let hips form to encourage dormancy. They also provide colorful interest in the late fall and winter garden.
* Remove any diseased blooms or fallen petals and foliage from the ground around the roses. That cuts down on fungal disease.
* Acquire the proper tools for rose pruning and winter chores: One pair of bypass pruning shears, one pair of goatskin gloves, one pair of knee pads, one pair of 24-inch loppers, one folding pruning saw.
* Find spots to plant more roses. It’s the start of bare-root season, too!
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Garden Checklist for week of May 19
Temperatures will be a bit higher than normal in the afternoons this week. Take care of chores early in the day – then enjoy the afternoon. It’s time to smell the roses.
* Plant, plant, plant! It’s prime planting season in the Sacramento area. If you haven’t already, it’s time to set out those tomato transplants along with peppers and eggplants. Pinch off any flowers on new transplants to make them concentrate on establishing roots instead of setting premature fruit.
* Direct-seed melons, cucumbers, summer squash, corn, radishes, pumpkins and annual herbs such as basil.
* Harvest cabbage, lettuce, peas and green onions.
* In the flower garden, direct-seed sunflowers, cosmos, salvia, zinnias, marigolds, celosia and asters.
* Plant dahlia tubers. Other perennials to set out include verbena, coreopsis, coneflower and astilbe.
* Transplant petunias, marigolds and perennial flowers such as astilbe, columbine, coneflowers, coreopsis, dahlias, rudbeckia and verbena.
* Keep an eye out for slugs, snails, earwigs and aphids that want to dine on tender new growth.
* Feed summer bloomers with a balanced fertilizer.
* For continued bloom, cut off spent flowers on roses as well as other flowering plants.
* Don’t forget to water. Seedlings need moisture. Deep watering will help build strong roots and healthy plants.
* Add mulch to the garden to help keep that precious water from evaporating. Mulch also cuts down on weeds. But don’t let it mound around the stems or trunks of trees or shrubs. Leave about a 6-inch to 1-foot circle to avoid crown rot or other problems.
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