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Dig In: Garden checklist for week of March 28

Warm temperatures inspire summer planting (but wait on tomatoes)

Sacramento Digs Gardening
BY Debbie Arrington PUBLISHED MAR 27, 2021

Small purple buds and leaf on lemon tree

Citrus trees, like this Genoa lemon, are starting to bud, which means it's time
to fertilize them. (Photos: Kathy Morrison)

Suddenly, it feels like tomato planting weather. But check the soil temperature before putting out your tender seedlings.

According to the National Weather Service, Sacramento is going to warm up to the low 80s, starting Sunday. We'll stay warm most of the week with at least four days forecast to be 80 degrees or above -- more than 10 degrees above normal for late March.

Gusty winds on Monday will keep that afternoon in the low 70s, but otherwise expect very warm and sunny conditions all week.

Soil thermometer showing 55 degrees in soil

The air temperature was 70 degrees when this photo was taken,

but the soil is still just 55 degrees -- still too cold for tomatoes, which

prefer a soil temp of 60 degrees and above. Peppers and melons

require even warmer soil temperature.

That makes it extra tempting to transplant tomatoes, peppers and other summer favorites. But the overnight lows will still be dipping down into the mid 40s. Likewise, the soil temperature hasn't warmed up enough yet to make summer vegetables feel really comfortable. Wait until overnight low temperatures stay reliably in the 50s before planting tomatoes, peppers and eggplant.

If this heat persists, soil temperatures will start warming up, too. Perhaps set out a few trial tomato plants next week to see what happens?

Meanwhile, there's plenty to keep you busy:
* Pull weeds now! Don’t let them get started. Take a hoe and whack them before they flower and go to seed.
*Feed camellias at the end of their bloom cycle. Pick up browned and fallen flowers to cut down on blossom blight.
* Feed citrus trees, which are now in bloom and setting fruit. To prevent sunburn and borer problems on young trees, paint the exposed portion of the trunk with diluted white latex (water-based) interior paint. Dilute the paint with an equal amount of cold water before application.
* From seed, plant beans, beets, cantaloupes, carrots, corn, cucumbers, melons, pumpkins, radishes and squash. Plant onion sets.
* In the flower garden, plant seeds for asters, cosmos, celosia, marigolds, salvia, sunflowers and zinnias. Transplant petunias, zinnias, geraniums and other summer bloomers.
* Plant perennials and dahlia tubers for summer bloom.
* Plant summer bulbs, such as gladiolus and tuberous begonias.
* Transplant lettuce and cabbage seedlings.

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Garden Checklist for week of May 19

Temperatures will be a bit higher than normal in the afternoons this week. Take care of chores early in the day – then enjoy the afternoon. It’s time to smell the roses.

* Plant, plant, plant! It’s prime planting season in the Sacramento area. If you haven’t already, it’s 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.

* 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.

* Don’t forget to water. Seedlings need moisture. Deep watering will help build strong roots and healthy 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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