About the Journal
From Me to You
Calendar of Events
Things to Expect & Do
Orchids in the Desert
Ask a Gardener
The Elegant Eggplant
Issue of Climate
Mt. Lemmon Marigold
My Special Eucalyptus
Real Gardens for
U of A Courier Service
T H I N G T O E X P E C T & T H I N G S T O D O
by Terry H. Mikel,
Extension Agent, Commercial Horticulture
POWDERY MILDEW often appears on new growth. Repeated sulfur powder (when
temperatures are less than 900F) or fungicide applications are often needed to
protect successive leave growth. Roses, grapes, cucurbits and euonymus are the
most likely hosts.
APHIDS on trees, shrubs, vegetables or flowers may occur. Populations are often
temporary. Use soapy water sprays or add detergent to other spray formulations
for better coverage.
WINTER WEEDS stimulated by winter rains are still growing. Do not allow them to
mature and produce seed. Mowing, cutting and raking afterwards are the only
SEASONAL LEAF DROP on carob, Mesquite, African sumac, pine and other trees will
occur as weather warms, as the older leaves make way for the new ones that are
CHECK STAKED TREES - Remedy trunk injury from ties and rubbing by removing
stakes or replacing rubber padding on ties.
PREPARE GARDEN SOILS for spring vegetable planting; early planting means better
yields in most spring crops.
FERTILIZE fruit, nut and shade trees, shrubs, and vines. Do not fertilize over
seeded rye lawns after February. Do not de-thatch common or hybrid Bermuda lawns
until early May or later.
SWEET POTATOES can still be started now. Buy the color you like at the store and
suspend it half deep in water with toothpicks, making sure the 'hook' end is up.
Simply buy one with a hook. Change water often to keep it fresh. After shoots
appear, plunge the whole thing (shoots half covered) in the water and roots will
THIN WILDFLOWERS NOW. They need room to grow during the upcoming vigorous
growth phase. Thinning also reduces the competition and the ones left flourish
PLANT CITRUS TREES. Young 2- to 5-year-old trees transplant most successfully.
Larger, older trees are more costly and suffer more shock. Protect bark from
sunburn and mechanical injury with a sturdy wrap of cardboard or newspaper.
INCREASE nitrogen fertilizing on onions. Remember, choose a nitrate form of
nitrogen. Avoid any fertilizer containing sulfur of sulfate, to reduce the
pungency of the onion.
TERMINAL DIEBACK in pines is usually a physiological response we call pine
blight. It has been more noticeable this year. Check the soil near the trunk.
Those with encircling roots express the worst symptoms.
MULCH GROUND SURFACES under roses and other heat sensitive plants.
APPLY IRON to bottle brush, pyracantha, silk oak and other plants with iron
deficiency symptoms. Chelated iron works faster. Reducing watering frequency
THINK HOUSEPLANTS for deeply shaded, outside areas. Green spiders,
philodendrons, dracaena, crinums, scheffleras and tupidanthus do wonderfully.
DO NOT DETHATCH Bermuda grass and hybrid Bermuda lawns until May.