Intense heat will challenge midsummer garden
Sunflowers at least thrive in summer heat. Make sure the rest of the garden is prepared to handle triple-digit temps. Kathy Morrison
Is your garden ready for a blast furnace? Near-record temperatures will torch much of Northern California this weekend, including Sacramento.
According to the National Weather Service, Sacramento can expect highs of 107 degrees on Saturday and Sunday with another triple-digit day on Monday. Temperatures will peak each day in the late afternoon – 3 to 5 p.m. – and will stay hot most of the evening.
The NWS has declared an Excessive Heat Warning for the Sacramento region with “dangerous heat” expected from 11 a.m. Saturday through 11 p.m. Sunday. Some communities may see 114 degrees. Overnight temperatures will stay in the 70s, getting mornings off to a warm start.
“Very high risk of heat stress or illness for entire population,” warned the NWS Sacramento office Saturday morning. “Stay hydrated. Avoid being outdoors in the sun 10 a.m. to 6 p.m.”
“Consider canceling outdoor activities during the heat of the day,” added the weather service. “Stay in a cool place.”
Atmospheric conditions will make these high-heat days feel even hotter; 107 will seem more like 110 or higher. However, our local rivers are still running fast and extremely cold due to snow melt; be careful near our waterways, the weather service adds.
By Monday (fingers crossed), our Delta breeze will return. Tuesday through Thursday are expected to be in the mid 90s – normal for mid July. At 93 degrees, Tuesday may be the best day to visit the State Fair. Friday is expected to start a streak of seven consecutive triple-digit days.
Meanwhile, our gardens are in survival mode:
* Keep your vegetable garden watered, mulched and weeded. Water before 8 a.m. to reduce the chance of fungal infection and to conserve moisture.
* Prioritize watering. Provide extra irrigation to recent transplants, vegetables, trees and shrubs.
* Check soil moisture before irrigation. Clay soils tend to hold moisture longer, looking dry on top but wet underneath.
* Mulch helps keep soil moist longer and roots cooler; add 2 to 3 inches of mulch if necessary.
* Weeds love this hot weather and will quickly go to seed. Whack them at their roots, aiming a hoe about an inch below the surface. (But wait until a cool morning midweek to tackle this chore.)
* Skip feeding vegetables and flowers until midweek when temperatures are cooler. Make sure to water deeply before fertilizing.
* Don’t let tomatoes, peppers or eggplant dry out completely; that can lead to blossom end rot. Deeply water veggies 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.
* Bees tend to rest during extreme heat, so new squash blossoms may not be pollinated. Either pollinate by hand with a small paintbrush or harvest the blossoms.
* 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.
* One good thing about hot days: Most lawns stop growing when temperatures top 95 degrees. Keep mower blades set on high.
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Garden Checklist for week of Nov. 3
November still offers good weather for fall planting:
* If you haven't already, it's time to clean up the remains of summer. Pull faded annuals and vegetables. Prune dead or broken branches from trees.
* Now is the best time to plant most trees and shrubs. This gives them plenty of time for root development before spring growth. They also benefit from fall and winter rains.
* Set out cool-weather annuals such as pansies and snapdragons.
* Lettuce, cabbage and broccoli also can be planted now.
* Plant garlic and onions.
* Keep planting bulbs to spread out your spring bloom. Some possible suggestions: daffodils, crocuses, hyacinths, tulips, anemones and scillas.
* This is also a good time to seed wildflowers and plant such spring bloomers as sweet pea, sweet alyssum and bachelor buttons.
* Rake and compost leaves, but dispose of any diseased plant material. For example, if peach and nectarine trees showed signs of leaf curl this year, clean up under trees and dispose of those leaves instead of composting.
* Save dry stalks and seedpods from poppies and coneflowers for fall bouquets and holiday decorating.
* For holiday blooms indoors, plant paperwhite narcissus bulbs now. Fill a shallow bowl or dish with 2 inches of rocks or pebbles. Place bulbs in the dish with the root end nestled in the rocks. Add water until it just touches the bottom of the bulbs. Place the dish in a sunny window. Add water as needed.
* Give your azaleas, gardenias and camellias a boost with chelated iron.
* For larger blooms, pinch off some camellia buds.
* Prune non-flowering trees and shrubs while dormant.
* To help prevent leaf curl, apply a copper fungicide spray to peach and nectarine trees after they lose their leaves this month. Leaf curl, which shows up in the spring, is caused by a fungus that winters as spores on the limbs and around the tree in fallen leaves. Sprays are most effective now.
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