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Roses that can take Sacramento heat and still look good

Lighter-colored blooms tend to cope better with triple-digit temperatures

Neon-yellow rose bloom
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.”

Butter-yellow rose bloom
The butter-yellow blooms of the Julia Child rose hold their
color in heat.

Due to their darker color, most red roses absorb more heat and are among the first to scorch. Or they open rapidly and quickly brown.

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.

Apricot-pink rose bloom
Daybreaker has the colors of a sunrise.
Another sun- and heat-loving floribunda in my garden is Day Breaker. Its apricot-peach blooms look like sunrise; no two are alike. All summer, the foliage has stayed bright green and healthy.

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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Garden Checklist for week of July 7

Take care of garden chores early in the morning, concentrating on watering. We’re still in survival mode until this heat wave breaks.

* Keep your vegetable garden watered, mulched and weeded. Water before 8 a.m. to conserve moisture.

* Prevent sunburn; provide temporary shade for tomatoes, peppers, eggplant, melons, squash and other crops with “sensitive” skin.

* Hold off on feeding plants until temperatures cool back down to “normal” range. That means daytime highs in the low to mid 90s.

* Don’t let tomatoes wilt or dry out completely. Give tomatoes a deep watering two to three times a week. Harvest vegetables promptly to encourage plants to produce more.

* Squash especially tends to grow rapidly in hot weather. Keep an eye on zucchini.

* Some weeds thrive in hot weather. Whack them before they go to seed.

* Pinch back chrysanthemums for bushy plants and more flowers in September.

* Harvest tomatoes, squash, peppers and eggplant. Prompt picking will help keep plants producing.

* Remove spent flowers from roses, daylilies and other bloomers as they finish flowering.

* Pinch off blooms from basil so the plant will grow more leaves.

* Cut back lavender after flowering to promote a second bloom.

* One good thing about hot days: Most lawns stop growing when temperatures top 95 degrees. Keep mower blades set on high.

* Once the weather cools down a little, it’s not too late to add a splash of color. Plant petunias, snapdragons, zinnias and marigolds.

* After the heat wave, plant corn, pumpkins, radishes, winter squash and sunflowers. Make sure the seeds stay hydrated.

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