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Speaking for the trees: Don't forget them in this heat

Invaluable shade for us and habitat for many creatures

Variety of street trees
Just one street in a Sacramento suburb, but many types of trees, all with their own irrigation needs.
(Photo: Kathy Morrison)


My east-facing driveway is my early morning thermometer. When I step out there to pick up the newspaper or put something in my car, I can tell what kind of day we're going to have, especially in summer. (This morning: Pretty bad, but short of volcano heat.)
Just a few feet away, in the southeast corner of the yard, the air is at least 5 degrees cooler, and the grass is still refreshing on bare feet. That's thanks to the big redwood tree someone planted there several decades ago. Not a good choice for our climate, certainly, but that tree saves us money in air-conditioning costs for at least some of the day. It's also an entire habitat for the birds and squirrels, including the best lookout tower in the neighborhood for the local scrub jays.
I'd never get rid of that tree, so I baby it, and especially during drought and heat waves.  (It's not the redwood in the photo above, by the way.)
Be good to your trees, and they'll continue to be good to you. Here are some tips from the Sacramento Tree Foundation and the UCCE master gardeners:
-- Know your trees! Native species of the Central Valley are well-adapted to the weather. Mature valley oaks, for instance, need just one or two deep waterings during the dry season. Redwoods like mine and other moisture-adapted trees (birches, magnolias, etc.) on the other hand, need regular deep waterings. And any tree that's planted near or in a lawn may have developed surface roots and have higher water needs. And young trees need more frequent irrigation than mature trees as they establish their roots.
-- Know your soil. Stick a screwdriver, a trowel or a soil probe into the soil around the tree about 6 to 12 inches. If the soil is dry and crumbly -- or rock-hard clay -- apply water slowly to soak down 12 to 24 inches. (See the tips at the end for ways to do this.) An estimated 85 percent of tree roots are in the top 18 inches of soil.
-- Know where to water. Irrigating at the base of a mature tree does nothing to help the roots, and might even cause rot. The roots extend out away from the tree much farther than you may think. Be sure to soak the root zone at least out to the drip line, defined as the soil beneath the edge of the leaves.
-- Know when to prune. During a heat wave, don't prune trees and other woody plants unless necessary (a cracked branch, for instance). Pruning stimulates shoot growth, which increases the need for water.
-- Know how to prevent rapid evaporation. Mulch, mulch, mulch! We say it a lot, because it works. Keep mulch a few inches away from the trunks of trees -- avoid "mulch volcanoes." Spread the mulch at least 3 inches deep across the root zone. This helps keep the soil cooler, will reduce weeds and will help retain soil moisture.
Methods of deep-watering trees:
-- Drip irrigation system that uses mini or micro sprinklers. (Make sure ANY sprinkler used doesn't splash water on the trunk or the base of the trunk.)
-- Soaker hose spiraled out to the tree's drip line. Reposition it as necessary.
-- A large, thin-plastic bucket with a couple of holes punched in the bottom. Position the bucket where you want to deep-water, fill the bucket and then let it soak in. Move the bucket and repeat. (This is labor intensive but does work, especially during drought water limitations. I found a 7-gallon clothes hamper that worked perfectly.)
-- Garden hose barely running. Also labor intensive (you have to move the hose a lot) but it will soak one area at a time quite well.
Prevent water runoff, of course, and don't water during windy conditions or during the middle of the day.

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Garden checklist for week of May 24

Take advantage of this “normal” week and get stuff done. Your garden needs you.

* Plant, plant, plant! It’s prime planting season in the Sacramento area. 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.

* Support with trellises, cages or stakes rapidly growing tomatoes, peppers, eggplants or other tall crops that may get knocked around in those gusty winds.

* 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. (You also can transplant seedlings for many of the same flowers.)

* Plant dahlia tubers. 

* Transplant petunias, marigolds and perennial flowers such as astilbe, columbine, coneflowers, coreopsis, dahlias, rudbeckia and verbena.

* Remember to irrigate your tender transplants. Seedlings need consistent moisture. Deep watering will help build strong roots and healthy plants. Water early in the morning for best results.

* 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.

* Put your veggie garden on a regular diet. Set up a monthly feeding program, and keep track on your calendar. Make sure to water your garden before applying any fertilizer to prevent “burning” your plants.

* As spring-flowering shrubs finish blooming, give them a little pruning to shape them, removing old and dead wood. Lightly trim azaleas, fuchsias and marguerites for bushier plants.

* Don’t forget to weed! Those invaders are growing fast.

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Food in My Back Yard (FIMBY) Series

Lessons learned during a year of edible gardening

WINTER

Is edible gardening possible indoors?

Hints for choosing tomato seeds

Starting in seed starting

Why winter is the perfect time to plant fruit trees

When to plant? Consider staggering your transplants

How to squeeze more food into less space

Potatoes from the garden

Plant a fruit tree now -- for later

Win the weed war by tackling them in winter

Tips for planting bare-root trees, shrubs and vegetables

Time to give vegetable seedlings some more space

Ways to win the fight against weeds

FALL

Dec. 16: Add asparagus to your edible garden

Dec. 9: Soggy soil and what to do about it

Dec. 2: Plant artichokes now; enjoy for years to come

Nov. 25: It's late November, and your peach tree needs spraying

Nov. 18: What to do with all those fallen leaves?

Nov. 11: Prepare now for colder weather in the edible garden

Nov. 4: Plant a pea patch for you and your garden

Oct. 27: As citrus season begins, advice for backyard growers

Oct. 20: Change is in the autumn air 

Oct. 13: We don't talk (enough) about beets

Oct. 6: Fava beans do double duty

Sept. 30: Seeds or transplants for cool-season veggies?

Sept. 23: How to prolong the fall tomato harvest 

SUMMER

Sept. 16: Time to shut it down? 

Sept. 9: How to get the most out of your pumpkin patch

Sept. 2: Summer-to-fall transition time for evaluation, planning

Aug. 26: To pick or not to pick those tomatoes?

Aug. 19: Put worms to work for you

Aug. 12: Grow food while saving water

Aug. 5: Enhance your food with edible flowers

July 29: Why won't my tomatoes turn red?

July 22: A squash plant has mosaic virus, and it's not pretty

July 15: Does this plant need water?

July 8: Tear out that sad plant or baby it? Midsummer decisions

July 1: How to grow summer salad greens

June 24:  Weird stuff that's perfectly normal

SPRING

June 17: Help pollinators help your garden

June 10: Battling early-season tomato pests

June 3: Make your own compost

May 27: Where are the bees when you need them?

May 20: How to help tomatoes thrive on hot days

May 13: Your plants can tell you more than any calendar can

May 6: Maintain soil moisture with mulch for garden success

April 29: What's (already) wrong with my tomato plants?

April 22: Should you stock up on fertilizer? (Yes!)

April 15: Grow culinary herbs in containers

April 8: When to plant summer vegetables

April 1: Don't be fooled by these garden myths

March 25: Fertilizer tips: How to 'feed' your vegetables for healthy growth