The Underground Advantage

One of my favourite topics involving nativescaping is nutrient cycling and rainwater infiltration. As for many ecosystem services, native plants thanks to their deep, complex root systems far outperform shallow-rooted conventional lawns in tapping into mineral layers and help rain water to penetrate deeply.

Root Depth Matters

When comparing native plants to conventional turfgrass lawns, one of the most striking differences is rooting depth. Most lawn grasses have roots that extend only 2 to 6 inches deep. In contrast, many native prairie species such as blazing star, coneflowers, and asters can reach 5 to 15 feet into the soil. This difference isn't just botanical trivia—it’s the key to unlocking powerful ecological benefits. Many of the plants in the graphic below are also native to the Edmonton area.

Root systems of native prairie plants of Southern Alberta. Illustration by Liz Saunders. The City of Calgary.

Enhanced Nutrient Cycling

Deep-rooted native plants play a vital role in restoring and maintaining soil health:

• Access to deeper nutrients: Their roots tap into mineral layers that shallow lawns can't reach, drawing up nutrients like nitrogen, phosphorus, and potassium.

• Organic matter enrichment: As native plants grow and die back seasonally, they deposit organic material deep into the soil, feeding microbial communities and improving soil structure.

• Reduced need for fertilizers: Native plants often thrive without synthetic inputs, unlike lawns that require regular fertilization to stay green.

This natural cycling reduces runoff pollution and supports long-term soil fertility.

Superior Rainwater Infiltration

Native plants transform your garden into a sponge for rainwater:

• Deep roots create channels: Their extensive root systems form vertical pathways that allow water to penetrate deeply, reducing surface runoff and erosion.

• Improved soil porosity: Native roots break up compacted soil, increasing its ability to absorb and retain moisture.

• Stormwater management: In rain gardens and bioswales, native vegetation can retain 50% to 97% of rainfall, acting like miniature retention ponds.

Lawns, by contrast, often shed water quickly due to their shallow roots and compacted soil, contributing to urban flooding and nutrient-laden runoff.

From Backyard to Watershed

Think of native plants as living infrastructure. Their roots stabilize soil, filter pollutants, and recharge groundwater. They don’t just beautify your yard—they restore ecological function. By gardening with native plants, you're not just improving your yard—you’re contributing to healthier watersheds, cleaner rivers, and more resilient ecosystems. It’s a small act with big ripple effects.