Urban Mini-Forests in Mercier-Hochelaga-Maisonneuve

In a context of climate change and urban densification, integrating nature into the city is more crucial than ever.

The borough of Montreal North (MHM) stands out for its concrete commitment in this regard with the development of urban mini-forests, an initiative that promises to transform neglected spaces into rich and beneficial ecosystems for the community.

The Concept of Mini-Forests: The Miyawaki Method

At the heart of this approach is often the Miyawaki method, developed by Japanese botanist Akira Miyawaki.

This technique aims to create dense, self-sustaining forests in record time (approximately 10 to 20 years to reach ecological maturity, compared to decades or centuries for natural forests). It relies on several key principles:

1. Soil preparation: Intensive enrichment with organic matter.

2. Selection of native species: Use of a wide diversity of local trees, shrubs, and climbing plants, promoting resilience.

3. Very dense planting: Up to 3 trees per square meter, which encourages rapid growth and healthy competition.

4. Minimal intensive maintenance: Once established (after 2-3 years), the mini-forest becomes self-sufficient.

These mini-forests are biodiversity hotspots that, in addition to their rapid growth, offer multiple ecological and social benefits in often limited spaces, such as neighborhood parks, edges of industrial lands, or transportation rights-of-way.

The Project

In Mercier-Hochelaga-Maisonneuve, the initiative is taking shape on several identified sites, often underutilized lawns or vacant lots.

The precise details of the sites are usually communicated by the borough during planting announcements.

The objective is multifaceted:

• Combating heat islands: Summer heatwaves are a major concern. These mini-forests provide shade and natural cooling.

• Improving air quality: Trees filter atmospheric pollutants and produce oxygen.

• Promoting biodiversity: They attract pollinating insects, birds, and small wildlife, recreating essential habitats in urban environments.

• Creating accessible green spaces: Offering residents places to connect with nature, conducive to relaxation and environmental education.

• Engaging the community: Plantings are often community events, strengthening social ties and citizen ownership of the spaces.

Budgets and Investments

Creating mini-forêts, especially with the Miyawaki method, represents a higher initial investment than planting scattered trees, due to the intensive soil preparation and planting density.

However, this investment is recouped by rapid growth and long-term self-sufficiency.

The City of Montreal, through programs like the Tree Planting and Greening Grant Program, and in collaboration with boroughs like MHM, allocates significant budgets to these initiatives.

Without an exact figure for MHM, a medium-sized mini-forest project (a few hundred to a thousand square meters) can cost from tens of thousands to over a hundred thousand dollars, depending on the size, soil preparation, number and diversity of plants, and the involvement of professionals (horticulturists, landscapers).

 These funds come from municipal budgets dedicated to the environment, urban planning, and sometimes from private partnerships or provincial and federal grants.

The City of Montreal's Broader Strategy: Greening the Metropolis

MHM's initiative fits perfectly into the City of Montreal's overall vision of becoming a greener and more resilient metropolis.

The City has set ambitious goals for canopy cover and combating heat islands, notably through its Climate Plan and its Urban Forest Action Plan.

• Canopy target: Montreal aims to significantly increase its canopy index to reach a higher percentage, particularly in neighborhoods most vulnerable to heat islands.

• Grants and programs: The City actively supports boroughs, community organizations, and even citizens through grant programs for tree planting, green roof creation, green alleys, and demineralization.

Other Similar Projects in Greater Montreal

The idea of mini-forests and intensive greening is not unique.

Several other boroughs and municipalities in Greater Montreal have already launched or are considering similar projects:

• The Urban Nursery at Frédéric-Back Park (Villeray–Saint-Michel–Parc-Extension): 

Although not strictly a Miyawaki mini-forest, this site of the former Miron quarry is an exceptional example of large-scale renaturalization, with thousands of trees planted.

• Pilot projects in other boroughs: Neighborhoods like Rosemont-La Petite-Patrie and Ahuntsic-Cartierville have also explored or implemented dense micro-plantations in parks or on institutional grounds (schools, hospitals).

• Community initiatives: Many green organizations and citizens are involved in local greening projects, sometimes inspired by Miyawaki principles, transforming small plots into green oases.

• Urban Ecology Network (REU): Organizations like the REU play a key role in promoting and supporting these greening initiatives across the metropolis, offering expertise and uniting stakeholders.

The mini-forests are much more than just tree plantings.

They represent a strong commitment to climate resilience, urban biodiversity, and improving the quality of life for citizens.

By being part of a broader vision for the City of Montreal, these miniature green lungs contribute to forging a greener, healthier, and more pleasant metropolis, one tree at a time, one mini-forest after another.

For more information on greening initiatives, sustainable development, and urban planning in Montreal, visit WikiResidence.ca and InfoDrone.ca!