THGC | January
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TREES: Planting: January is an excellent time to plant trees, especially fruit trees.
Transplanting: Can be done this month with good results.
Fertilizing: No fertilizer should be applied to trees this time of year
Pest Control: Scale infestations can be sprayed with a lightweight horticultural oil – do not spray immediately before below freezing temperatures are expected. Spray several times about 10 days apart.
Pruning: Winter is the ideal time to prune both deciduous and evergreen trees. Do not prune spring flowering trees now.
Watering: Water in newly planted trees thoroughly. Established trees will normally receive enough water through rainfall this time of the year.
ROSES: Planting: Container roses can be planted throughout this month. 
Transplanting: Late December through early February is the best time to transplant roses.
Fertilizing: No fertilizer should be applied to roses this month. 
Pest Control: Blackspot may be active if the weather is mild and the roses have not gone dormant.
Pruning: Wait until February to prune.
Watering: It is unlikely that you will need to water your roses this month unless the winter is dry. Natural rainfall this time of year is generally adequate. LAWN: Planting: It is too late to overseed and too early to spread seeds for warm weather grasses. You can lay sod during this month although it will not be green since it is dormant. 
Fertilizing: If you overseeded with a cool-season grass you can apply fertilizer the middle of this month.
Pest Control: Winter weeds may be found during this month.
Mowing: Mow overseeded lawns as needed. Ryegrass is mowed to a height of 1 to 2 inches, so it should be cut when it has grown 1 ½ to 3 inches tall.
Watering: Normally cool, moist weather generally makes irrigation unnecessary during this month.
SHRUBS: Planting: January is an excellent month for planting shrubs. 
Transplanting: Shrubs are as dormant as they will get this month and that makes it an ideal time to transplant. 
Fertilizing: No shrubs should be fertilized in January
Pest Control: Winter is an excellent time to apply horticultural oil sprays to shrubs that are prone to scale. Do not spray if the nighttime low is predicted below 40 degrees.
Pruning: You may prune just about anything except spring- flowering shrubs during January.
Watering: There is generally no need to water established shrubs in January. Newly planted shrubs should be watered in thoroughly and thereafter regular rainfall should give them enough water. If a hard freeze is expected and the soil is dry, water thoroughly before the freeze arrives.
PERENNIALS: Planting: Perennials can be planted this month.
Transplanting: January is a good month to transplant perennials.
Fertilizing: Few perennials are in active growth during the winter. This is not the best time to fertilize them.
Pest Control: Insect and disease problems are a minimum this time of year.
Pruning: Cut back and remove old, dead upper portions of dormant perennials to keep your garden looking more attractive. 
Watering: Cool/cold temperatures, typical rainy weather, and the dormant condition of many perennials make watering unnecessary. BULBS Planting: Plant pre-chilled tulips, and hyacinths now.
Watering: Pots of spring bulbs should be watered as needed to keep the soil moist. 
ANNUALS: Planting: You can plant cool season annuals this time of year. 
Fertilizing: If cool season annuals are pale or yellow-green,  you can apply a soluble fertilizer and green them up.
Pest Control: Watch for aphids if weather is mild.
Watering: If the weather is dry, water thoroughly.