Environment

The many benefits of the minuscule but mighty Miyawaki forests

Pioneered by a Japanese botanist, compact Miyawaki forests are beginning to replace backyard lawns on tiny plots around Canada

To support native insects, birds, mammals, reptiles and amphibians, trees, like the American beech and black cherry must be native to the area. (Photo: Allen Woodliffe/Can Geo Photo Club)
Expand Image

A tree is not just a tree. It is part of a collaboration of living creatures both intricate and mysterious — microbes, fungi, shrubs, ground- covers. In turn, this assemblage attracts insects, birds and mammals in a merry mashup of collegiality.

This refashioned understanding of the tree is giving rise to a tiny, forested revolution in cities across the world, including several in Canada. Rather than planting lawns around a solitary tree — once the ideal — municipalities, homeowners, schools, businesses and others are planting Miyawaki forests.

Named after the Japanese botanist Akira Miyawaki who invented them about 40 years ago, the densely planted forests are perhaps the size of a tennis court, often even smaller. But these minuscule forests are mighty, containing hundreds of plants, each striving to get its share of sun and rain. Done the right way, the forests achieve mature heights in about 20 years, rather than 100 or more, because they grow up rather than out.

“It’s one of those few things that when you first create it, it just gets better over time,” says landscape architect Heather Schibli. Her firm manages CanPlant, an organization that is beginning to track Miyawaki forests in Canada and the native species they contain.

So far, there are nearly a dozen in Ontario and Quebec, with plans in the works for many more across the country. One of them is in Schibli’s backyard in Guelph, Ont. Its 230 woody plants are packed into eight metres by nine, leaving enough room for a back deck, trampoline and shed.

Schibli started by covering her lawn with a layer of cardboard, then adding compost and mulch. Once the forest was planted, she needed to bolster organisms in the soil, a key element of forest life. She took a spoonful of soil from a local wild forest, using it to make a “tea” with which to water the new forest. This tea fosters mycorrhizae, the fungal threads that bind plants together, communicating and sharing food.

The trees must be native and local, evolved to live together. They are chosen to form four structural layers — canopy, sub-canopy, arborescent (small understorey) trees, and shrubs.

The benefits multiply. Trees that grow tall quickly absorb more carbon dioxide than trees that grow slowly, building carbon into root and branch. The forests help manage storm water: Schibli’s neighbours diverted run-off water to her backyard to nurture the trees. Air quality around the forest is better because of the oxygen the plants emit, and all that greenery absorbs noise and soothes the spirit. More species arrive. It’s the recipe for an ecosystem.

Expand Image
Advertisement

This story is from the September/October 2022 Issue

Related Content

Climate strike Victoria BC

Environment

Why Canada should recognize its citizens’ environmental rights

David Boyd, a Canadian environmental lawyer and UN Special Rapporteur on Human Rights and the Environment, reveals how recognizing the human right to a healthy environment can spur positive action for the planet

  • 1447 words
  • 6 minutes

Environment

The sixth extinction

The planet is in the midst of drastic biodiversity loss that some experts think may be the next great species die-off. How did we get here and what can be done about it?

  • 4869 words
  • 20 minutes
leather sea stars

Environment

“We did this:” Is there a way out of our intertwined climate and biodiversity crises?

As the impacts of global warming become increasingly evident, the connections to biodiversity loss are hard to ignore. Can this fall’s two key international climate conferences point us to a nature-positive future?

  • 5595 words
  • 23 minutes
Endangered caribou

Environment

Mapping out a new approach to biodiversity protection

Decisions around where to establish new protected areas in Canada should consider wildlife and ecosystem health first

  • 879 words
  • 4 minutes