Lighter-colored blooms tend to cope better with triple-digit temperatures
|Neon-yellow Shockwave easily handles Sacramento summer heat. (Photos: Debbie Arrington)|
Some roses can take the heat better than others. I see proof of that all over my garden.
This heat wave has been a real test of rose fortitude under stressful conditions. Many bushes have sunburned leaves. Blooms on most of my hybrid teas are about half the size of normal; a cut back in irrigation during this drought-plagued summer is contributing to that issue.
But a few bushes have actually thrived during this high heat – and that prompted an in-depth discussion with Farmer Fred Hoffman for his “Beyond Basics: The Garden Basics with Farmer Fred Newsletter.”
That discussion became fodder for his latest post, “Roses That Can Take the Heat.”
“Sacramento (City Motto: “At Least It’s a Dry Heat”) is no stranger to prolonged, triple-digit heat waves, which can occur anytime from May through September,” Hoffman wrote in his introduction. “So, the area is a good testing ground for roses that maintain their color, health and vigor throughout spring, summer – and sometimes fall – heat waves. One trait many of these have in common: these rose bushes produce light-colored blooms of white, pink or yellow.”
The butter-yellow blooms of the Julia Child rose hold their
color in heat.
Lighter blooms tend to reflect that excess heat and stand up better to high temperatures. Of course, there are exceptions. (In this weather, Pink Promise, a light pink hybrid tea, immediately fades to dirty cream with brown edges.)
Which rose varieties stand up to the heat, keep blooming and looking great? Two yellow floribundas top my list: Julia Child and Shockwave. Most yellow roses tend to fade as they open, but both of these varieties hold their golden color. Julia Child has a more buttery hue (appropriate for its namesake) while Shockwave borders on neon. In addition to good color, both floribundas have beautiful, bright green, disease-resistant foliage that’s resistant to sunburn, too.
Among the best known heat-busting roses is Iceberg. This white floribunda fills parking lot borders throughout California; it can take pollution as well as high temperatures. It’s also drought tolerant, needing only weekly irrigation to keep blooming strong.
|Daybreaker has the colors of a sunrise.|
Landscape shrub roses such as the Drift series (Peach Drift, Apricot Drift, etc.) and Knockout roses (Double Knockout, Home Run, etc.) have built-in heat and drought tolerance. These roses stay short (under 2 to 3 feet) and are “self cleaning,” meaning they drop spent flowers as they age out; no deadheading necessary.
Of the big roses, First Prize – a neon-pink hybrid tea – has kept its bloom color all summer (although its foliage is showing some signs of sunburn).
Most of the miniature roses have done OK, mostly because the blooms and whole plants are smaller. They also benefit from a little shade from nearby bigger bushes. The best of the heat-busting minis is the appropriately named Joy, a spectacular little gem. Its cream-colored blooms are edged with bright purple-pink.
To listen to Fred’s podcast and read his newsletter: https://bit.ly/3wbUiRL .
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Dig In: Garden Checklist
For week of March 19:
Spring will start a bit soggy, but there’s still plenty to do between showers:
* Fertilize roses, annual flowers and berries as spring growth begins to appear.
* Watch out for aphids. Wash off plants with strong blast from the hose.
* Pull weeds now! Don’t let them get started. Take a hoe and whack them as soon as they sprout.
* Prepare summer vegetable beds. Spade in compost and other amendments.
* Prune and fertilize spring-flowering shrubs after bloom.
* Feed camellias at the end of their bloom cycle. Pick up browned and fallen flowers to fight blossom blight.
* Feed citrus trees as they start to blossom.
* Cut back and fertilize perennial herbs to encourage new growth.
* Seed and renovate the lawn (if you still have one). Feed cool-season grasses such as bent, blue, rye and fescue with a slow-release fertilizer. Check the irrigation system and perform maintenance. Make sure sprinkler heads are turned toward the lawn, not the sidewalk.
* In the vegetable garden, transplant lettuce and kale.
* Seed chard and beets directly into the ground.
* Plant summer bulbs, including gladiolus, tuberous begonias and callas. Also plant dahlia tubers.
* Shop for perennials. Many varieties are available in local nurseries and at plant events. They can be transplanted now while the weather remains relatively cool.
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