Western Sustainable Agriculture Research & Education
(SARE) Farm Internship Curriculum and Handbook
Tom and Maud Powell and Michael Moss, Sustainable Farmers, Jackson County, OR.
Technical advisor: Tim Franklin, Jacksonville, OR.
Curriculum advisor: Peter O'Connell, Jacksonville, OR.
Web advisor: National Center for Appropriate Technology, Butte, MT.
A hedgerow is a densely planted pattern of trees or shrubs used to create a protective barrier around a field of crops.
The learner will:
- Identify multiple purposes for hedgerows on the farm
- Recognize factors influencing hedgerow design
- Learn the basics of plant selection, planting, and caring for hedgerows.
Functions of Hedgerows
- Physical barrier - to humans or livestock
- Visual barrier - aesthetically pleasing
- Wind barrier - block wind, thus decreasing evapotranspiration in fields
- Create shade - creates niches in field for shade tolerant plants; stops evaporation of water from soil
- Temperature regulation - vegetation tends to moderate climate extremes
- Create habitat - habitat for pollinating insects, birds and small critters
- Create food source - fruits and nuts
- Create usable material - fuel wood, fencing material, weaving material, posts
- Prevent erosion - root mass holds soil and blocks runoff
Factors influencing layout and species selection of hedgerows
- Environmental Factors
- Climate - (average high and low temperatures, precipitation)
- Soil type - (composition and fertility)
- Prevailing wind direction
- Aspect -(e.g. north facing slope for fruit trees to avoid early bloom)
- Site Factors
- Location of roads, fields, buildings, waterways, etc.
- Goals of Designer
- What purpose(s) will the hedgerow achieve?
- Create edge - An edge exists where two systems meet and overlap. (i.e. where a forest meets a meadow.) Maximum biological activity takes place along edges. The designer emphasizes this effect by planting a curving hedge because a curving line has more linear distance between to fixed points than a straight line.
- Pathways - The paths between hedgerows can be either clean cultivated, meaning bare-earth with vegetation either hoed or tilled; or paths can have vegetative cover which is managed to fix nutrients, choke weeds, hold soil, and provide mulching material. (i.e. buckwheat, clover, fescue combination.)
- Special plants - Certain nitrogen-fixing shrubs can be planted amongst fruit and nut trees to provide nitrogen to the trees. (i.e. ceanothus, pea shrubs, eleagnus)
- If from a nursery, plants should be grown in a similar climate. Plants can come from the nursery in a variety of forms: potted, balled and burlap, and bare root (most common)
- Home sourced plants can be grown from seed or cuttings and are especially good because they come from the same climate and ecosystem in which they will live.
- Choose a time to plant that is appropriate for species and region
- Scalp surrounding area clean of any competing vegetation
- Make a hole large enough not to impinge roots
- Trim off broken roots
- Plant to proper depth (avoid creating a basin for the trees to be submerged in if the rainy season is long.
- Use appropriate soil amendments. Too much can coddle the tree and the roots will remain in the planting hole and not venture out into native soil.
- Pat soil around roots until firm but not compacted
- Water in thoroughly
Care and Maintenance
- Use fencing to protect from deer, beavers, etc.
- Line the planting hole with poultry netting before planting to protect from gophers, moles, and voles.
- Paint tree trunks of fruit and nut species with white latex paint diluted 50% with water to protect from sun, cold, and borers
- Retains moisture in the soil
- Smothers weeds
- Moderates soil temperature
- Prune fruit and nut species
- Follow specific instructions for type of tree
- Pruning is critical in the first few years
- Irrigation - if required
- Determine irrigation schedule (see "Irrigation" chapter)
- Ensure schedule is adequate by observation
- Annual fertilization
- Fertilize during period of dormancy
- Foliar spraying is acceptable in the spring
- If hedgerow becomes too crowded, thin out selected trees to create spaces for others
- How many distinct functions of hedgerows can you identify?
- What are some care and maintenance needs of hedgerows?
- Gaia's Garden - Toby Hemenway
This page was last updated on: May 16, 2012