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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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Garden Checklist for week of Dec. 8

Make the most of dry weather while we have it this week. Rain is returning.

* Rake leaves away from storm drains and gutters. Recycle those leaves as mulch or add to compost.

* It’s not too late to plant something. Seed wildflowers and plant such spring bloomers as sweet pea, sweet alyssum and bachelor buttons.

* Trees and shrubs can be planted now, especially bare-root varieties such as fruit trees or rose bushes. This gives them plenty of time for root development before spring growth. They also benefit from winter rains.

* Plant bare-root berries, kiwifruit, grapes, artichokes, horseradish and rhubarb.

* Set out cool-weather annuals such as pansies and snapdragons.

* Lettuce, cabbage and broccoli also can be planted now.

* Brighten the holidays with winter bloomers such as poinsettias, amaryllis, calendulas, Iceland poppies, pansies and primroses.

* Keep poinsettias in a sunny, warm location; bring them inside at night or if there’s rain.

* Plant garlic and onions.

* Prune non-flowering trees and shrubs while they’re dormant.

* Clean and sharpen garden tools before storing for the winter.

* Mulch, water and cover tender plants to protect them during threat of frost. Succulent plants are at particular risk if temperatures drop below freezing. Make sure to remove coverings during the day.

* Rake and remove dead leaves and stems from dormant perennials.

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