Bare root tree, shrub and rose planting – Make sure tree roots are moist before planting. Dig a hole at least twice the size of the root ball and deep enough for it to stand on its own. Cover with loose soil. Create a small ridge of soil around the log so that the water does not run off. Add mulch (without touching the trunk) to keep the roots warm through the winter. Slowly water the tree after planting so the water penetrates deep into the root system. Continue to water deeply and regularly until spring (even after light rains).
Harvest and plant cool season vegetables: Vegetable plants added in October should be producing in December. You can still plant cool-season vegetables like broccoli, Brussels sprouts, cabbage, cauliflower, celery, kale, mustard, and lettuce. Beets, carrots, and radishes can also be planted in December.
Add California Natives – Plant native vegetation now so it becomes established in the spring. Your local nursery should have the varieties that work well in your area. According to the California Native Plant Society, there are more than 7,000 native plants in California. Go to their site to see which plants are native to your specific region, https://calscape.org.