Month-by-Month: Chores for Desert Gardeners at Extreme Altitudes
By The National Gardening Association, Bob Beckstrom, Karan Davis Cutler, Kathleen Fisher, Phillip Giroux, Judy Glattstein, Mike MacCaskey, Bill Marken, Charlie Nardozzi, Sally Roth, Marcia Tatroe, Lance Walheim, and Ann Whitman from Gardening All-in-One For Dummies
The Southwest deserts encompass mild-winter climates of the low-elevation deserts of Arizona and California. (The mountains of Arizona and New Mexico, as well as west Texas, have a more typical cold-winter, summer-only season for growing annuals.) Glory time for annuals is late winter and early spring in low-desert Arizona, primarily around Phoenix and Tucson, and California’s Coachella Valley. This calendar starts in September to reflect the true beginning of the planting season:
If you live in a temperate, high-altitude climate, follow the calendar for the Northern gardeners. recommendations.
September: Prepare planting beds. Midmonth or later, set out nursery transplants for winter and spring bloom — maybe even by Christmas. Provide temporary shade during the hottest weather. Early in the month, you still have time to start annual flower seeds in flats or pots to transplant into the ground later in the fall. If summer annuals are still going strong, keep them watered thoroughly and fertilize every two or four weeks.
October: Continue to set out annuals for blooms before the end of the year. Water thoroughly after planting and provide temporary shade during extra-hot spells. Sow seeds of low-spreading annuals to cover bare spots in bulb beds. If your timing is good, everything will bloom all at once. Start regular feeding a few weeks after planting annuals.
November: You still have time to plant for winter and spring bloom. Cooler weather encourages a new crop of aphids, plus slugs and snails.
December: You still have time to plant seedlings. Watch your soil for signs of dryness, and water as needed.
January: After the holidays, nurseries stock up with blooming annuals in small pots. Shop for color that you can use right away in pots or in gaps in planting beds. Watch for aphids and take steps to control them. Pull or hoe seasonal weeds, or mulch beds with a layer of organic matter to smother weeds and weed seeds.
February: Cool-season annuals are peaking this month in the low desert. Maintain top performance by removing dead flowers, watering thoroughly, and feeding regularly. Start seeds of warm-season annuals indoors to transplant into the garden in four to six weeks. Prepare beds for spring planting.
March: In the low desert, transplant warm-season annuals. Pinch back at planting time and snip off flowers to encourage bushier growth. A few weeks after planting, fertilize young annuals and begin a regular (bi-weekly or monthly) fertilizing schedule.
April: Plant heat-loving annuals, such as marigolds and zinnias. Adjust the frequency of sprinkler systems as the weather heats up.
May: Spring flowers are winding down. Pull them out and replace them with heat-lovers. Pinch tips of young annuals for bushier growth.
June: This is your last chance to plant for summer blooms. Make sure that you choose from among the true heat-lovers: globe amaranth, salvia, and the most reliable of all, vinca rosea.
July and August: Water and mulch. You don’t do any planting at this time of year. Feed summer annuals regularly. Remove faded flowers.
Gardening Glossary
annuals
Plants that complete their entire life cycle within one growing season. The plant germinates from seed, grows and blooms, and then produces seed and dies.
Gardening Glossary
biennials
A plant that take two growing seasons to complete its life cycle. It germinates and grows leaves and stems in the first year; produces flowers and fruit (seed) in the second, and then dies.
Gardening Glossary
bolt
When a plant flowers or produces seed prematurely.
Gardening Glossary
cold frame
A wooden or concrete block box in which you can grow plants or hold dormant during the cold winter months.
Gardening Glossary
cole crops
A family of vegetables, including broccoli, cabbage, cauliflower, kale, and Brussels sprouts. They thrive in cooler weather.
Gardening Glossary
complete fertilizer
Any fertilizer that contains all three of the primary nutrients, N-P-K (nitrogen, phosphorus, potassium). Phrase is based on regulations governing the fertilizer industry. Does not mean that the fertilizer literally contains everything a plant needs to thrive.
Gardening Glossary
deadheading
The practice of pinching or cutting off spent flowers
Gardening Glossary
evaporative-pad humidifier
A humidifier in which fans blow across a moisture-laden pad that sits in a reservoir of water.
Gardening Glossary
harden off
The process of acclimating plants grown indoors gradually to the brighter light and cooler temperatures of the outside world.
Gardening Glossary
hardiness
The ability of a plant to survive is called its hardiness.
Gardening Glossary
humus
A stable end product of organic-matter decomposition that's believed to increase microbial activity in soil, improve soil structure, and enhance the root development of plants.
Gardening Glossary
Bacillus thuringiensis Bt
An effective bacteria that attacks only the larvae of caterpillar family insects. It is safe to other insects, animals, and humans.
Gardening Glossary
macronutrients
Mineral nutrients that plants need in the largest quantities: nitrogen, phosphorus, potassium, calcium, magnesium, and sulfur.
Gardening Glossary
mulch
Organic or inorganic material placed over the surface of soil, usually directly over the root zone of growing plants. Used to conserve moisture, kill weed seedlings, modify soil temperature, provide attractive covering to garden beds.
Gardening Glossary
organic matter
Once-living stuff like compost, sawdust, animal manure, ground bark, grass clippings, and leaf mold (composted tree leaves). Used to enrich soil and improve soil texture.
Gardening Glossary
perennials
Any plant with a life cycle of three or more years. Herbaceous (non-woody) perennials include flowering plants and herbs, mainly. Woody perennials include trees and shrubs. Longevity depends on the plant and growing conditions.
Gardening Glossary
pH
The measure of soil's acidity. Soil with low pH means it's too acidic; soil with high pH means it's alkaline. Most plants grow best in soil with a pH value between 6.5 and 7.2. Neutral soils measure 7.
Gardening Glossary
photosynthesis
The process through which plants take nutrients from the air and from the water in the soil to produce sugars that fuels the plant's growth.
Gardening Glossary
primary nutrients
Nitrogen, phosphorous, and potassium are the three nutrients plants need in the largest quantities.
Gardening Glossary
root crops
Plants with edible underground roots such as onions, carrots, beets, potatoes, turnips. Most root crops are cold-weather crops.
Gardening Glossary
self-blanching
A type of cauliflower with leaves that naturally curl over the head and exclude light. Requires cool temperatures for leaves to curl effectively.
Gardening Glossary
sets
Small onion bulbs, about 1/2-inch wide, that were started from seed the previous year. Grow onion sets with the pointy end up.
Gardening Glossary
side-dressing
The act of adding a small amount of fertilizer around or "on the side" of plants after they're growing.
Gardening Glossary
succession planting
Planting small, 2-to-4-foot patches of plants every two weeks throughout the growing season so that you can harvest a crop over an extended period of time.
Gardening Glossary
thinning
The act of cutting the least robust seedlings in your garden to give the healthier plants more room to grow.
Gardening Glossary
vining crops
Crops that grow on vines, such as cucumbers, melons, pumpkins, and winter squash. They usually require support (staking, trellising, etc.) to keep them off the ground.
