Sacramento Digs Gardening logo
Sacramento Digs Gardening Article
Your resource for Sacramento-area gardening news, tips and events

Articles Recipe Index Keyword Index Calendar Twitter Facebook Instagram About Us Contact Us

Get the garden ready for heat wave

How to help plants cope with triple-digit days ahead

Sunflowers with yellow petals, brown centers
Sunflowers are quite effective as shade in the vegetable garden. Plant
some now and they'll be tall in no time. (Photos: Kathy Morrison)



Is your garden ready for triple-digit heat?

So far, Sacramento has managed to stay under the 100-degree mark all spring. But it’s Memorial Day weekend; of course, we’re going to see a scorcher!

Never mind that we’ve been comfortably in the low 80s, even 70s. High temperatures on Sunday and Monday will be 20 degrees higher than a week ago.

According to the National Weather Service, an excessive heat warning will be in effect from noon Sunday through Tuesday evening for most of the Sacramento Valley and foothills. Afternoon highs could reach 108 degrees on Memorial Day.

Don’t let your garden sizzle. Help your plants cope:

* Deep-water shrubs, trees, perennials and vegetables. Give your tomatoes a good soaking.

* Keep soil evenly hydrated; not too wet or completely dried out. Use a moisture meter, long screwdriver or trowel to check. Maintaining even moisture is crucial for maturing tomatoes to prevent blossom-end rot.

* Don’t fertilize during a heat wave. It can stress already-thirsty plants.

* Watch for sunburn on leaves. Erect temporary shade if needed.

* Sunburn also can damage bark, especially on young trees or shrubs, opening up the plant to wood-boring pests and premature death. It tends to be worse on the west- and south-facing sides of plants.

* If possible, move container plants out of full sun to partial shade. Container plants dry out fastest and may need water every day during high heat.

* Mulch, mulch, mulch! Spread a thick, cooling layer of organic material to retain that moisture and keep plant roots temperate. Use straw, old leaves, bark, grass clippings, even shredded newspaper. Don’t use rocks; they retain too much heat.

* Harvest lettuce, cabbage, broccoli and other cool-season vegetables. This heat will cause them to bolt – send out flower shoots and go quickly to seed. Higher temperatures also tends to make greens bitter.

* Harvest artichokes before the flowers open. (The heat will open them quickly.) Those little artichokes on side shoots won’t get bigger; they’re ready, just smaller.

Beet greens
Beet greens appreciate some shade and plenty of mulch when the
weather turns hot.

* Shade peas, spinach and other cool-season crops that aren’t ready to harvest. Erect temporary shade structures to ward off some of that blistering afternoon sun. That will buy those veggies a few more weeks of production.

* Already have baby tomatoes or peppers? Shade those plants in the hot afternoon, too, to protect from sunburn.

* Keep an eye on new plantings and seedlings. Make sure they stay hydrated. Check soil moisture and water in the early morning or evening.

These won’t be our last triple-digit days. Help your veggie garden stay cool with these tips:

* Create some needed summer shade for veggies – plant sunflowers. These fast-growing (and tall) plants can shade garden neighbors that appreciate an afternoon break from direct sun, such as peppers or eggplant.

* Let the vines keep the soil cooler. Plant watermelons, pumpkins, sweet potatoes, cucumbers, squash and other vining crops. Their vines will cover the soil, keeping it cooler and blocking out weeds. To be doubly effective, mulch around the plants before the vines cover everything.

Comments

0 comments have been posted.

Newsletter Subscription

Sacramento Digs Gardening to your inbox.

Local News

Ad for California Local

Taste Spring! E-cookbook

Strawberries

Find our spring recipes here!

Thanks to Our Sponsor!

Cleveland sage ad for Be Water Smart

Garden Checklist for week of June 22

Mornings this first week of summer will remain comfortably cool – just right for gardening!

* Water early in the morning to cut down on evaporation. Check soil moisture and deep water trees and shrubs. Keep new transplants and veggies evenly moist. Deep water tomatoes to encourage deep roots.

* From seed, plant corn, melons, pumpkins, radishes, squash and sunflowers.

* Plant basil to go with your tomatoes.

* Transplant summer annuals such as petunias, marigolds and zinnias. It’s also a good time to transplant perennial flowers including astilbe, columbine, coneflowers, coreopsis, dahlias, rudbeckia, salvia and verbena.

* Tie up vines and stake tall plants such as gladiolus and lilies. That gives their heavy flowers some support.

* Dig and divide crowded bulbs after the tops have died down.

* Feed summer flowers with a slow-release fertilizer.

* Mulch, mulch, mulch! This “blanket” keeps moisture in the soil longer and helps your plants cope during hot weather.

* Avoid pot “hot feet.” Place a 1-inch-thick board under container plants sitting on pavement. This little cushion helps insulate them from radiated heat.

* Thin grapes on the vine for bigger, better clusters later this summer.

* Cut back fruit-bearing canes on berries.

* Feed camellias, azaleas and other acid-loving plants. Mulch to conserve moisture and reduce heat stress.

* Cut back Shasta daisies after flowering to encourage a second bloom in the fall.

* Trim off dead flowers from rose bushes to keep them blooming through the summer. Roses also benefit from deep watering and feeding now. A top dressing of aged compost will keep them happy. It feeds as well as keeps roots moist.

* Pinch back chrysanthemums for bushier plants with many more flowers in September.

Taste Summer! E-cookbook

square-tomatoes-plate.jpg

Find our summer recipes here!

Taste Fall! E-cookbook

Muffins and pumpkin

Find our fall recipes here!

Taste Winter! E-cookbook

Lemon coconut pancakes

Find our winter recipes here!