A cottonwood needs plenty of room, full sun, and deep water during dry spells, plus regular checks for weak or dead limbs. Its most common problems are storm breakage, roots that seek out water lines and foundations, cankers and leaf diseases, and the cotton that female trees release each spring.

Why does cottonwood need more attention than most shade trees?

Because it grows very fast and very large, often 80 feet or more, with soft wood that breaks easily. That speed and size make limb failure, aggressive roots, and wound diseases more likely as the tree ages, especially near homes and driveways.

How is a cottonwood watered and pruned?

With deep, occasional watering and careful structural pruning. Cottonwoods are native to stream banks and need a thorough soaking during droughts, while dead, cracked, or crossing limbs are removed in late winter, with clean cuts that avoid tearing the bark, since wounds let canker fungi in.

What problems are common on cottonwoods?

Breakage, cankers, leaf diseases, and insects. Sunken, discolored cankers on branches and trunk, rust and leaf spot that brown the foliage by late summer, borers in stressed trees, and gall making aphids on the leaf stems all turn up often, though healthy, well watered trees resist most of them better.

How can the cotton from a female cottonwood be reduced?

By treating the tree at bloom. On a healthy female tree whose cotton clogs screens and gutters, Florel Fruit Eliminator sprayed with good coverage at mid to full bloom, on a day between 65 and 95 degrees Fahrenheit, reduces the seed and cotton that season.

Frequently Asked Questions

How far from a house should a cottonwood be planted?

Well away from it. Its large size and water seeking roots make a generous distance from foundations, septic systems, and water lines the safest choice.

Do all cottonwoods produce cotton?

No. Only female trees do, and male, cottonless cultivars are often chosen for yards for that reason.

How long does cottonwood live?

Often less than a century. Fast growth and soft wood give cottonwoods a shorter life than many slower shade trees.

Is a cottonwood with a large dead limb safe?

Not always. A large dead or split limb over a house, drive, or play area is best assessed by a certified arborist.