Cottet Willow (Cottetii)

Leaves are not retained year to year.

Uses of : Landscaping, Medicinal, Culinary, etc.

Dwarf willow is recommended for erosion control plantings along small stream channels. It can be incorporated into soil bioengineering systems to control erosion along streambanks resulting from flood and ice damage. Fast growth, resilient stems, and ability to recover from mechanical damage make it an ideal plant for this use. When used in this manner, it provides cover for small animals and browse for deer, beaver, and rabbits and exceptional nesting sites for birds.

This willow is also suitable for use as a living snow fence and/or a farmstead windbreak where moisture is adequate.

General Characteristics

Dwarf willow is a small to medium sized shrub growing only 6 to 8 feet high, with smooth, slender, tough, resilient branches that are lime green at first but later change to a darker green. The cultivar, ‘Bankers’ was introduced from the alpine region of West Germany in the mid-1960s. This selection is a natural hybrid between Salix retusa L. and Salix myrsinifolia Salisb. It is a sterile hybrid, therefore it produces no seed.

‘Bankers’ is a semiprostrate shrub, sending up many branches from the roots to form a dense surface cover. The roots themselves form an interlocking network to tie the soil together. It rarely spreads by layering of branches. Growth is rapid from cuttings, with plants reaching full height in 3 to 5 years. Plantings made on 2-foot centers can produce solid stands in 2 to 3 years.

Required Growing Conditions

Dwarf willow grows best on moist sites that are subject to periodic flooding and overflow. It can be used on soils of any texture. Dwarf willow competes well with herbaceous plants that are less than 2 feet tall. The cultivar ‘Bankers’ is climatically adapted throughout the Appalachian region from New York to Alabama, and has also been used successfully in Oregon and Washington west of the Cascade Range.

Cultivation and Care

Dwarf willow is susceptible to severe browsing by livestock and cannot be established without protection. Banks that are eroded and undercut to a steep unplantable slope require grading prior to planting. Cuttings: Plant as one year old rooted cuttings, or dormant hardwood cuttings. If dormant cuttings are used, they should be 3/8 to 1/2 inch at the thick end, 12 to 15 inches long, and made before the leaves emerge. Dormant cuttings should be planted vertically with only an inch or two protruding. If they cannot be pushed in the soil by hand, use a rod to make a hole but be sure the cutting is tamped in well with the heel to avoid leaving any air spaces. If the soil is too stony to for this technique, the cutting may be buried horizontally about two inches deep in damp soil. Rooted cuttings should be planted in a hole dug big enough to accommodate the root system when well-spread. On difficult streambanks, it is sometimes necessary to mulch the planting with coarse plant material, even wiring and staking the mulch down in some cases. Plant at two to three foot spacing from just above water's edge or rip-rap, to the top of the bank.Soil Bioengineering Uses: Dormant whips are very useful when bundled into wattles (live fascines) or for brush layering and mattressing systems. ‘Bankers' willow can be produced in the nursery to specification to meet all the above uses. Planting methods for soil bioengineering are regionally varied. Consult with the Plant Materials Specialist for planting recommendations.

General Upkeep and Control

Dwarf willow used on streambanks is subject to considerable mechanical damage. The site should be inspected annually in spring, after heavy run-off has subsided, for needed repairs. Gaps should be filled in by replanting, or laying down and covering branches of nearby plants. Any mechanical measures used to control the bank, such as stone rip-rap, must be kept in repair as well.

Pests and Potential Problems There are no serious pests or diseases of dwarf willow.

Cultivars, Improved, and Selected Materials (and area of origin) A variety of dwarf willow, 'Bankers' (Germany), was released by the Quicksand, Kentucky Plant Materials Center in 1983. Rooted and unrooted cuttings, whips, and wattles can be purchased from a variety of nurseries in the Northeast.

Plant Basics
Category
Plant Nativity Cultivated, or not in the U.S.
Physical Characteristics
Displays Fall Colors No
Flower Conspicuousness No
Gardening Characteristics
Cold Stratification Required No
Toxic to Nearby Plants No
Toxic to Livestock No
After-Harvest Resprout Ability No
Responds to Coppicing No
Growth Requirements
pH Range 0–0 pH
Precipitation Range 0–0 inches/yr
Planting Density 0–0 indiv./acre
Minimum Frost-Free Days 0 day(s)
Sustainability & Use
Leaf Retention No
Fire Resistant No

Source: USDA, NRCS, PLANTS Database, plants.usda.gov.
National Plant Data Center, Baton Rouge, LA 70874-4490 USA