Permaculture is a design approach that arranges land the way a functioning ecosystem arranges itself, so the system does more of the work and needs fewer inputs each year. It does work in the Skeena Valley, though several of its best-known techniques need adapting first. Much of the published material assumes a climate where capturing and holding water is the central problem, and Terrace has the opposite situation.
What is permaculture?
The word combines permanent and agriculture. Bill Mollison and David Holmgren developed the system in Hobart, Tasmania through the mid-1970s, running what amounted to a three-year design experiment in their own backyard, and published Permaculture One in 1978. Mollison traced the original idea to watching marsupials feed in Tasmanian rainforest and noticing how much that system produced with nobody managing it.
In practice it means designing for the whole system at once. Perennial plants that come back on their own, soil built up through compost and mulch instead of replaced every season, water placed deliberately, and enough diversity that the planting does not hang on any single element. A design done this way should need less maintenance as it matures.
How is permaculture different from ordinary landscaping?
Ordinary landscape design is generally judged on how a space looks the day the work is finished. Permaculture is judged on how it behaves in year ten.
Annual bedding gives way to perennials. Fertilizer and imported topsoil give way to compost and mulch that improve the ground over time. Drainage and irrigation stop being separate systems bolted on at the end and become part of how the site is laid out in the first place. The two approaches are not in conflict, and a good design usually borrows from both, but they are asking different questions.
Does permaculture work in a cold, wet climate?
Yes. Cold is not the main obstacle, since Terrace sits in plant hardiness zone 7a, milder than most of northern British Columbia, and winter survival is rarely what limits a well-chosen perennial here.
Water is the harder part of the design, because Terrace receives somewhere between about 2,100 and 2,250 mm of precipitation a year, spread across roughly 217 days. A great deal of permaculture technique exists to capture and hold water on sites that do not have enough of it, and applied unchanged in the Skeena, some of that technique makes an existing problem worse.
Do permaculture swales work in the Skeena Valley?
A swale in permaculture is a shallow ditch dug along the contour of a slope, built to slow water down and let it soak into the ground instead of running off. On dry land that is the whole point.
Published guidance on swales carries two cautions that both apply in this valley. The first is that in poorly draining soils water will not infiltrate, so a swale can worsen waterlogging instead of relieving it, especially in the years before planting has established. The second is a safety matter. Deliberately infiltrating water upslope of a building or a road on a clay hillside can increase landslide risk, and the standard advice is to bring in a geologist or building inspector before doing it.
The valley fill around Terrace is largely glaciomarine mud and glaciofluvial gravels, and the geological literature describes the Terrace and Kitimat area as a landslide-modified glaciomarine landscape, with documented rapid landslides in sensitive glaciomarine sediment. Those materials are also the reason so many yards in the valley stay wet, and deliberately adding water to a slope here needs more care than it would in a drier place.
None of that makes swales wrong in the Skeena Valley. It makes them a decision to take site by site, on evidence, instead of a default that gets installed because a permaculture course recommended it.
What changes in a northern permaculture design?
- Mounds instead of basins. Published practice in humid climates and heavy soils is to plant on the mound instead of in the trench, so roots sit above the water table rather than in it. The same earthworks that store moisture in a dry climate get shaped to shed it here.
- Cold air drainage. Cold air moves downhill the way water does, only slower, so a raised bed or a hedge running straight across a slope can trap it and create a frost pocket. Running beds slightly off contour lets the cold air keep moving. That is the reverse of the on-contour rule most permaculture material opens with.
- Sun capture. South-facing slopes take more light, which counts for a lot where the whole year totals about 1,986 hours of sunshine. On flat ground, mounding and raised beds recreate part of the same effect.
- Warmth from decomposition. Hugelkultur beds, built over buried wood, generate heat as the wood breaks down, and freeze and thaw cycles speed up the breakdown of coarse material over winter. With a frost-free window of about 143 days, a bed that warms early buys real time.
Can you grow a food forest in Terrace?
A food forest is a planting arranged in vertical layers the way a natural woodland is, most often described as seven of them: canopy, understory, shrub, herbaceous, ground cover, root and vine.
The layered structure works here, though each layer has to be filled with plants that will take zone 7a winters, tolerate a wet dormant season, and still produce inside a cool 143-day season with limited accumulated heat. Berries, hardy fruit and a wide range of perennial herbs and root crops do this well. A good deal of what appears in food forest guides written for warmer regions will not.
What permaculture will not do
It will not take the work out of the first few years. A perennial system needs several seasons to establish, and during that period it asks for at least as much attention as a conventional planting. The drop in labour comes afterwards.
It also does not override climate. A design that ignores the frost-free window, the light available, or where water sits on a site will fail whatever principles it was built on.
Permaculture design in northwest British Columbia
Permaculture works here when the design starts from this valley's conditions instead of from a template. In practice that means reading where water moves before placing any earthworks, choosing species against zone 7a and a cool short season, and treating slope work as a geotechnical question as much as a horticultural one. Mauldin Horticulture provides permaculture-informed landscape design, planting plans and farm design across northwest British Columbia.