It's not easy to control the humidity in your house, but plants grow best where the humidity is greatest - usually in the kitchen. Sometimes you can help improve the humidity around a plant by putting the plant on a pebble-filled saucer with water just below the base of the pot, but not touching it. Now let's direct our attention outdoors and take a look at gardening. One of your main duties for December is to protect your plants from damaging cold weather. Citrus trees, poinsettias, cassia, rubber plants, hibiscus, allamanda, bougainvillea, philodendron, succulents, copper plants, coleus, silk oak and night-blooming jasmine all need protection.
Protection means covering the upper parts of the plant and the soil over the roots.
Covering just the exposed parts of the plants is not enough in a hard freeze. Remove all the protective coverings on the parts of the plants above the ground immediately after the frost danger has passed. As far as covering the soil is concerned, put mulch around tender plants or those you think are susceptible to cold damage. Leaves, leaf mold, bagasse, pine needles or sawdust all make good mulches. Also, you may need to water your plants if you expect a freeze.