Black Willow

Black willow is a deciduous North American tree in the Salicaceae family. Narrow leaves and dark, fissured mature bark accompany a broad crown. Its mature size and spreading root system call for generous landscape space. [1]

Established black willow prefers full sun and tolerates some partial shade. Avoid a deeply shaded corner, and choose its permanent site for water access as well as light. [1]

Protect leafy cuttings from direct sun and drying wind while they root; gradually remove their humidity cover after roots develop. [5]

Black willow needs consistently moist to wet soil. Check a small rooted pot frequently in hot weather and water before the root ball dries; established landscape trees also need a suitably moist site. [1]

Feel below the surface and water slowly across the mix. Brief rain may miss sheltered pots; stop once water reaches the drainage holes. [6]

Use a draining pot that fits the roots and a moisture-retentive, loam-based container mix. Choose a stable base; progressively enlarge the pot as roots fill it. [2]

Keep this deciduous tree outdoors through its growing season. For overwintering, protect the pot: roots above ground face more severe cold than roots insulated by garden soil. [7]

Do not fertilize an unrooted cutting or use feed to treat wilt. Newly planted landscape trees usually need careful watering rather than fertilizer; use a soil test before correcting a suspected deficiency. [8]

For established container growth, follow a complete container-feed label and account for fertilizer already in fresh mix. Pause routine feeding during dormancy. [9]

Begin with dead, damaged or rubbing twigs. Use sharp tools, preserve the branch collar and shape gradually. Large limbs and work overhead belong with a qualified arborist. [13]

Prune black willow in late winter to early spring. Plan for mature canopy size; repeated severe reduction is not a substitute. [1]

Wilt with dry mix: rewet the root ball and reduce drying wind while it recovers. Wilt with sodden mix: check blocked drainage and compacted medium before adding more water. [9]

Sticky growth or distorted young leaves: inspect stems for aphids. Rust-colored spots or galls need closer identification; photograph affected and healthy leaves before seeking local extension advice. [14]

Increase moisture checks as spring foliage expands, and inspect containers frequently during summer heat. In autumn, let leaves fall naturally as the tree rests. [14][6]

After dormancy, heel the pot into suitable garden soil or use a protected cold space suited to your climate. Check thawed mix for dryness; avoid moving it into a warm living room. [7]

Other willows also bear the name black willow. Compare botanical names before choosing a landscape site. [1]