Southern Arizona December gardening calendar  
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THINGS TO EXPECT:
FROSTY MORNINGS. Wrap the trunks of young citrus and other cold-tender trees to protect them from the winter freeze. And cover sensitive vegetables and bedding plants, as freezing nights are forecast. Remove these coverings every morning.
ALTERNARIA ROT may be found in blossom ends of a few navels and occasionally other oranges. Remove badly infected fruits, to prevent possible spread and attracting pests.
CITRUS FRUIT DROP due to rainy weather or overwatering.
ALEPPO BLIGHT can occur this month. It’s thought to be induced by day-night temperature extremes on tender actively growing section of these trees. Sun-exposed sides are most affected. Except for severe cases, normal refoliation occurs in the spring.
BLUISH-PURPLISH GROWTH on some actively growing plants is caused by cold weather.
CHLOROSIS & LEAF DROP of citrus and other evergreens can occur. Short days, winter weather, drought or over-watering may be responsible.
FUNGUS DISEASE IN FREOUENTLY WATERED WlNTER GRASS. Minimize watering frequency and promptly treat with recommended fungicides.
HOUSE PLANTS experience winter also. Reduce watering, and fertilization accordingly and expect same yellowing and drop of older leaves.
FUNGUS DISEASES IN FLOWER BEDS. Minimize wetness of ground surfaces and promptly treat with recommended fungicides.

THINGS  TO  DO:
WINTER WATERING SCHEDULES should be adjusted to about 1/3 of. the summer frequency for deciduous and dormant plants, but water deeply each time. Winter lawns and growing flowers may require once to twice per week watering depending on weather. Don't over-water.
FERTILIZE WINTER LAWNS about monthly to maintain good color. Nitrate fertilizers give quickest response during cool seasons.
MOW WINTER LAWNS WHEN GRASS IS DRY to minimize spread of diseases.
CONTROL WEEDS while they are young and tender, or before their seeds sprout.
BE ATTENTIVE TO WEATHER FORECASTS and protect freeze tender plants.
DELAY TREE & SHRUB PRUNING UNTIL JANUARY
PREPARE FOR BARE-ROOT TRANSPLANTING. It's best done in January.
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