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Colorful plants can thrive in intense heat (but may need some shade)
Kahili ginger loves intense heat and can take some cold. Debbie Arrington
Nobody looks good at 115 degrees. But there are several perennials that thrive in triple-digit temperatures. All they need is some afternoon shade.
You might think that Sahara-like temperatures are only fit for cacti. (Desert plants don’t like this much heat either.) Sacramento’s hottest day ever has me considering what flowers can still bloom in ultra-high heat.
Instead of desolate desert landscapes, our current heatwave has me dreaming about tropical places; a jungle may be incredibly hot, but it’s lush.
My own backyard jungle is holding its own during this heatwave, thanks to afternoon shade and deep watering. Some perennials are even blooming profusely.
My current jungle stars are the kahili ginger and hardy hibiscus. These plants don’t only withstand intense heat, but chilly winter nights that may dip below 30 degrees.
Kahili ginger (Hedychium gardnerianum), native to the southern Himalayas, needs a kiss of cold to bloom. It gets that in Sacramento, producing huge yellow flower stalks in late August. With long red stamens, the feathery flowers get their nickname from the Hawaiian royal standard that symbolized power. The stalks are 6 foot tall, topped with the distinctive blooms. Worldwide, it’s the most cultivated of all ginger varieties.
Hardy hibiscus looks like its tropical Hawaiian cousin but can withstand sub-freezing cold as well as triple-digit heat. The long canes (6 to 8 feet) die back in winter as the plant goes dormant.
New cultivars stay more compact; only 3 to 4 feet tall. On shorter canes, these cultivars bear bigger blooms, often 8 inches across. They’re hardy in Zones 4 through Sacramento’s Zone 9. My favorites are two hot pinks: Peppermint Schnapps and Brandy Punch.
According to perennial specialist Proven Winners, other heat-loving perennials include sedum, caladium, euphorbia, gaillardia, coneflowers, salvia and lantana. Most can tolerate full sun, but do better in Sacramento with a little afternoon shade.
Look around in your own garden. What’s thriving in this heat? You may consider growing more of that plant in summers to come.
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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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