Sweet Crab Apple

Year-round

Sweet crab apple handles Durango's climate fine once it's established, but this high, dry mountain setting means paying attention to sun, watering rhythm, and a couple of disease and pet safety risks that come with the territory.

• Give it full sun, at least 6 hours of direct light a day. It can handle some afternoon shade, but too much shade means fewer flowers and more powdery mildew on the leaves.
• Once established, this tree is fairly drought tolerant and only needs around 15 to 20 inches of total moisture a year between rain, snowmelt, and any watering you do. Durango's annual precipitation runs close to that on its own, so extra watering is mainly for dry stretches.
• Skip planting it right next to junipers or red cedar. Crabapples and junipers pass a fungus called cedar-apple rust back and forth, and junipers are common in Durango yards and open space nearby.
• Keep fallen fruit and wilting or dropped leaves cleared away from where pets can reach them. The seeds and wilting leaves contain a compound that turns into cyanide if chewed, so it's worth staying on top of cleanup.
• Prune out dead, damaged, or crossing wood in late winter or very early spring, and finish by around June 1. Next year's flower buds start forming on the branches in June and July, so pruning later can cut down next spring's bloom.

Fall

Fall is when Durango's mountain climate calls for a few tree-specific chores before the ground freezes, wrapping the trunk and building up mulch.

• Wrap the trunk with a commercial tree wrap in fall, from the base up to the first main branches, to prevent sunscald from intense high-elevation winter sun on bark that hasn't thickened yet. Take the wrap off again in spring.
• Add or refresh 3 to 4 inches of mulch over the root area, pulled back from touching the trunk. It slows the soil from freezing and holds moisture into winter.
• Rake up and dispose of fallen leaves and fruit rather than leaving them under the tree, especially if it had scab or rust spots this year. It cuts down on next year's infection.
• Check whether the trunk needs fencing or a guard against deer, elk, or rodents, since bark browsing tends to pick up in fall as other forage dies back.
• Give the tree a deep, final watering in late fall before the ground freezes solid, especially if autumn has been dry. It helps the roots head into winter without added drought stress.

Raking up dropped fruit and fallen leaves through fall keeps the front yard looking tidy, an easy low-effort win on an HOA-conscious property.

Winter

Durango winters are cold mountain winters, and the main job is watering during dry stretches and protecting the trunk, not much else.

• Water only during extended dry periods with no snow cover, and only when air temperatures are above 40 degrees, about once or twice a month. Never water frozen ground.
• Aim for a slow soak reaching about 12 inches deep, roughly 10 gallons of water for each inch of trunk diameter measured 6 inches above the ground.
• Snow cover is actually good insulation for the roots. A dry stretch with bare ground is when winter watering matters most, not right after a fresh snow.
• Keep the tree wrap on the trunk through winter if one went on in fall. It protects thin bark from sunscald caused by intense high-elevation winter sun.
• Hold off on any pruning until late winter, closer to when growth is about to resume, rather than doing it in the coldest part of the season.

A tree wrap on the trunk reads as normal winter tree care to most HOA-conscious neighbors, not an eyesore, so there's no need to pull it off early for appearance.

Spring

Spring bloom timing shifts with Durango's elevation, and a late frost browning the blossoms is normal here, not a sign something is wrong with the tree.

• Bloom happens anywhere from April into May depending on the variety and how high up you are. At Durango's elevation, expect it on the later side of that window.
• A late frost turning open blossoms brown is common at this elevation and isn't a sign of a sick tree. It usually just means a lighter fruit crop that year.
• Start watering again once daytime air temperatures are reliably above 40 degrees and the ground has thawed. Don't water frozen soil.
• Water with a soaker hose, drip line, or hose-end wand aimed at the soil rather than overhead sprinklers. Keeping the leaves dry cuts down on scab and rust.
• Check new growth for aphids. A firm spray of water most mornings usually keeps a small outbreak in check without needing anything else.

Summer

Summer in Durango runs hot and dry, so watering is the main job, and dry heat brings its own set of pests to watch for.

• This tree is drought tolerant once established, needing only around 15 to 20 inches of total moisture a year. In a dry summer stretch with no rain, a deep soak every couple of weeks usually beats frequent light watering.
• Water slowly so it soaks down about 12 inches, using a soaker hose, deep-root fork, or soft spray wand rather than an overhead sprinkler. Wetting the leaves invites scab and rust.
• Watch for spider mites in hot, dry spells. They show up as fine speckling or webbing on the leaves, and a strong hose rinse on the undersides usually handles a light case.
• Small green fruit forms through summer and ripens toward fall. A home tree doesn't need thinning.
• Keep 3 to 4 inches of mulch out to the dripline, pulled back from touching the trunk, to hold soil moisture through the dry heat.