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Ozone can be stressing your garden

Hot, smoky conditions create dangerous pollutant levels

Leaves, with one showing ozone damage
These pictures compare a normal tulip tree leaf
and one exposed to too much ozone.
(Photos courtesy National Park Service)




Smoky skies and record heat make gardening -- or just about any outdoor activity -- intolerable right now. Usually our gardens cope better with these conditions than we do; they can filter out the pollutants and conserve their resources.

But the air is so bad now, even plants are feeling ill effects.

Today (Monday) will be the 22nd consecutive Spare the Air Day for the Bay Area -- and the greater Sacramento region, a record for this current streak of poor air quality. Driving, operating gas-powered equipment, barbecuing and other activities are discouraged (if not prohibited).

The past few days that bad air has been accompanied by excessive heat, creating a ground-hugging layer of ozone. That's making our eyes water -- and our plants suffer.

Ozone is created by a combination of wildfire ash and other pollutants (usually nitrogen oxides and volatile organic compounds), intensified by bright sunlight and triple-digit heat. It can prevent a plant's leaves from properly doing their job. Ozone enters the leaves' stomata and burns the leaves' tissue.

Signs of ozone damage include dark stippling and bleaching of foliage. Plants lose their vigor and stop blooming or yielding fruit. Ozone damage weakens the plant and makes it much more susceptible to pests and disease.


What can you do to help your plants cope? Keep them hydrated. Offer them some afternoon shade. Wash ash and soot from leaves.

And continue to "Spare the Air." These smoky conditions are expected to last at least through Wednesday.

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Garden Checklist for week of July 21

Your garden needs you!

* Keep your vegetable garden watered, mulched and weeded. Water before 8 a.m. to reduce the chance of fungal infection and to conserve moisture.

* Feed vegetable plants bone meal, rock phosphate or other fertilizers high in phosphate to stimulate more blooms and fruiting. (But wait until daily high temperatures drop out of the 100s.)

* 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.

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

* 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.

* It's not too late to add a splash of color. Plant petunias, snapdragons, zinnias and marigolds.

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

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