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Dig In: Garden checklist for week of March 28

Warm temperatures inspire summer planting (but wait on tomatoes)

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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Dig In: Garden checklist for week of Sept. 25

This week's warm break will revive summer crops such as peppers and tomatoes that may still be trying to produce fruit. Pumpkins and winter squash will add weight rapidly.

Be on the lookout for powdery mildew and other fungal diseases that may be enjoying this combination of warm air and moist soil.

* Late September is ideal for sowing a new lawn or re-seeding bare spots.

* Compost annuals and vegetable crops that have finished producing.

* Cultivate and add compost to the soil to replenish its nutrients for fall and winter vegetables and flowers.

* Plant for fall now. The warm soil will get cool-season veggies and flowers off to a fast start.

* Plant onions, lettuce, peas, radishes, turnips, beets, carrots, bok choy, spinach and potatoes directly into the vegetable beds.

* Transplant lettuce, cabbage, broccoli, kale, Brussels sprouts and cauliflower.

* Sow seeds of California poppies, clarkia and African daisies.

* Transplant cool-weather annuals such as pansies, violas, fairy primroses, calendulas, stocks and snapdragons.

* Divide and replant bulbs, rhizomes and perennials.

* Dig up and divide daylilies as they complete their bloom cycle.

* Divide and transplant peonies that have become overcrowded. Replant with "eyes" about an inch below the soil surface.

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