Here’s a zone-by-zone to-do list for the month of January.
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Zone 9
Use the weather to your advantage: Observe the location of standing puddles left by winter rains; note where you need to improve drainage for plants.
Finish pruning fruit trees, vines, and bushes.
Sow seeds of geraniums, peppers, tomatoes, and eggplant in pots filled with a peat moss/vermiculite mixture; set the pots on a sunny windowsill or beneath lights until it's warm enough to plant them outside.
In the garden, "scratch in" wildflower seed mixes and California poppy seeds; plant nasturtium seeds a bit deeper.
Set out transplants of pansies, calendulas, and primroses.
As the soil warms, plant carrots, broccoli, lettuce, spinach, cilantro, parsley, and Asian greens.
Harvest carrots, radishes, and Brussels sprouts—sweetened by frost.