Citrus and vegetable plants love liquid seaweed—spray vegetable plants weekly and citrus trees monthly for added nutrients and disease prevention.
New plant growth slows down and some pests go dormant in the cooler months, but spider mites and thrips can still be a problem. Keep checking for pests regularly and apply horticultural oil or soap sprays as needed.
December is a good time to plant trees and shrubs—but postpone major pruning, especially of trees and shrubs that are cold sensitive, to avoid encouraging new growth before a cold snap.
Have your cold-protection plan in place and watch weather reports. Be ready to cover tender plants with sheets and blankets if a freeze or frost warning is in place. Watering plants the day before a cold snap is also beneficial. Bring in orchids if temperatures drop below 40°F. More details and tips about cold-weather protection for your garden.
Clean bird baths and prepare your feeders for the winter influx of feathered friends.
Flowers to plant in December include alyssum, delphinium, geraniums, ornamental cabbage and kale, petunias, pansies, snapdragons, and violas.
Vegetables and herbs to plant in December include arugula, beets, brussels sprouts, cabbage, carrots, cauliflower, celery, chives, cilantro, dill, fennel, lettuce, mustards, onions, oregano, parsley, peas, radishes, rosemary, sage, spinach, thyme, and turnips.
