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Mulch is good, and more mulch is better

Don't let the sun cook your plants' roots

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104 -- and not yet the peak of the heat.
(Photos: Kathy Morrison)
It's June 4 and it's going to be at least 100 degrees again this afternoon. Do you know where your mulch is?
I bought more straw this morning after I took a soil thermometer out into my rapidly heating backyard Wednesday afternoon. The air temperature at 2:15 p.m. was 99 degrees, according to my cellphone's weather app, and the wall thermometer in the shade in the garden itself read 98. So it already was plenty hot.
I stuck the soil thermometer into the top inch of a non-mulched spot next to a basil plant in my raised bed, which at that point was in full sun (and had been for several hours).
The thermometer popped up to 104 degrees -- in the area on the thermometer helpfully labeled "MAX."
I pushed the thermometer down several inches in the same spot; the number dropped to 97 degrees. Still quite hot, but better.  Next I tried a shady area in the same raised bed: 82 degrees, in the optimal range. So my goal is to bump up the mulch here, and keep those plant roots in the optimal range. The cooking can happen later, in the kitchen.
A few other gardening notes on this early June day:
-- Harvest Day this year will be virtual, because of the coronavirus risk. This is a big event held the first Saturday in August at the Fair Oaks Horticulture Center. The UCCE Sacramento County master gardeners typically show off their demonstration gardens in a festive atmosphere. This year, the master gardeners will have a collection of videos highlighting their various areas. There will be a lot more information coming as we get closer to August. One good thing: The videos will allow folks who've never been able to attend Harvest Day to "visit" the Hort Center.
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Squash plants, hanging in there. They'll get more
mulch.
-- Keep a close eye on your vegetable plants. With this heat, all the nasty things that can happen to them are being exacerbated. Bugs! Wilting! Fungus! Pollination problems! But remember: Don't overwater; don't feed a plant that's wilting; keep some shade cloth handy for the plants suffering most. Oh, and mulch!

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Garden Checklist for week of May 12

Get your gardening chores and irrigation done early in the day before temperatures rise.

* 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.

* Direct-seed melons, cucumbers, summer squash, corn, radishes, pumpkins and annual herbs such as basil.

* Harvest cabbage, lettuce, peas and green onions. This heat will cause leafy greens and onions to flower; pick them before they bolt.

* 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.

* Got fruit trees? If you haven't already done so, thin orchard fruit such as apples, peaches, pears, pluots and plums before they grow too heavy, breaking branches or even splitting the tree. Leave the largest fruit on the branch, culling the smaller ones, and allow for 5 to 6 inches (or a hand's worth) between each fruit.

* Thin grape bunches, again leaving about 6 inches between them. For the remaining bunches, prune off the "tail" end, about the bottom third of the bunch, so that the plant's energy is concentrated in the fruit closest to the branch.

* 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.

* 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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