Dig In: Garden checklist for week of Dec. 20

Even if they're still trying to bloom, start pruning your roses now. Strip off any remaining leaves, too. (Photo: Kathy Morrison)

Foggy nights and chilly mornings; welcome to winter in Sacramento!

A new season starts Monday with a crisp, cool forecast now through Christmas. According to the National Weather Service, Sacramento will see afternoon highs hovering around 59 degrees and overnight lows dipping to almost freezing but not quite.

With ground still damp from recent rain, that combination creates perfect conditions for fog, which will settle into the valley for the next few nights. All that moisture will speed up fungal diseases such as botrytis.

Expect to see sudden changes in your garden. Although many deciduous plants have been holding onto their foliage and acting like it’s still October instead of almost January, they’ll stop dropping leaves in bunches now and quickly slip into dormancy.

Make the most of this pre-Christmas week. Work off some calories and show your garden some TLC.

* Prune non-flowering trees and shrubs while they’re dormant. It’s easier to see their structure without their leaves.

* Start pruning roses, even if they’re still trying to bloom. Strip off any remaining leaves, so the bush will be able to put out new growth in early spring.

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

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

* The first day of winter is the shortest day of the year – a great time to plant garlic and onions for harvest in summer.

* Bare-root season has begun. Plant bare-root berries, kiwifruit, grapes, artichokes, horseradish and rhubarb. Beware of soggy soil. It can rot bare-root plants.

* In the vegetable garden, plant fava beans, head lettuce, mustard, onion sets, radicchio and radishes.