Time for rest, sweet December
Sever ties with old
Making room for new
December is filled with holiday functions, family travel, and (hopefully) some much needed rain. The Bay Area is still struggling with drought, even though the greening hills seem to say otherwise. With all the hustle and bustle of the holiday season, it is easy to put aside garden tasks for another time. We need to rest when we can, too, just as our garden plants do each winter. But December is an excellent time to prevent future problems in the landscape. With just a little bit of effort now, we can have bigger harvests and healthier plants next summer.
Bare root planting
December is an excellent time to install bare root plants in the Bay Area. (It’s a good time for onions, as well.) Any of these plants can be planted in December:
Occasional rains will help keep compost piles moist, but remember to turn your compost pile to incorporate the oxygen needed by helpful microorganisms.
Divide & cut perennials & bulbs
Some plants will perform better next year by being cut back or divided in December. Dividing plants means digging them up and separating clusters of roots or bulbs, and replanting them with room to expand. Chrysanthemums, alum root, seaside daisy, yerba buena, purple needle grass, daylilies, Douglas iris, deer grass, Idaho fescue, purple needle grass, and many bulbs are just a few of the plants that benefit from this treatment.
Santa Clara County’s first and last frost dates are November 15 and March 15. For plants that may be damaged by frost, you can protect them by draping sheets, tarps, or other light fabric over and around them. Do not allow the fabric to touch the plants. Umbrellas and old fashioned (not LED) Christmas lights can also provide some protection. Potted plants can be brought indoors or closer to protective structures. And be sure to water frost sensitive plants. Damp soil holds more heat than dry soil. Also, mulch can stabilize below ground temperatures. If frost damage does occur, resist the urge to clip away the damaged bits - they create a barrier against further frost damage. If it looks really hideous, leave it covered.
Garden bed care
As many annuals end their lifecycle, be sure to remove them from the garden bed. Adding plant debris to the compost pile not only creates nutrient rich compost, but it interrupts the lifecycle of many garden pests and diseases. If plant materials are already diseased, they should be thrown in the trash.
Holiday plant care
Poinsettias, Christmas trees, Christmas cactus, amaryllis, and many other holiday plants find their way into our homes in December. Most of these plants prefer cooler temperatures and higher humidity than most homes can provide. Keeping plants away from heater vents and misting them occasionally will help. Also, avoid overwatering.
Winter irrigation is largely dependent on the weather. December is a good time to turn off the sprinklers and monitor the soil. Cooler temperatures mean slow growth but some water is still needed. Also, if an area becomes saturated, avoid walking on it. This prevents soil compaction.
Happy holidays, fellow gardeners!