Page 30 - FWG December Issue 2025

Estate News

MIMICKING NATURE: REHABILITATING THE

FOURWAYS GARDENS RIVER SYSTEM

fter years of sediment build-up, Instream vegetation trees provide shade and pollinator habitat
the desilting of the Fourways Reeds, sedges, and aquatic grasses such as while absorbing stormwater overflow.
Gardens river system marks a Cyperus textilis (river grass) and Phragmites
Aturning point, not just in restoring australis (common reed) are re-established Eco-barriers and buffer strips
flow and function, but in re-establishing to anchor sediment and slow water Strategically planted eco-barriers act as
a living ecosystem. Life Green Group, in movement. These plants reduce turbidity, filters for runoff entering the river. These
partnership with Fourways Gardens Estate, trap silt, and provide shelter for aquatic vegetated strips use dense root systems to
has developed a rehabilitation approach insects, frogs, and small fish. Their dense trap debris and absorb nutrients before they
that goes beyond repair. It’s about roots knit the soil beneath the waterline, reach the water. Species such as Bulbine
mimicking nature to create a resilient, self- protecting the channel from scouring frutescens, and Helichrysum cymosum serve
sustaining landscape where water, soil, and during heavy rain. as living infrastructure, stabilising slopes,
vegetation work together to protect and cleaning water, and supporting insect life
nurture biodiversity. Dam walls and embankments that feeds birds and amphibians.
On dam walls and steep slopes, deep-
Restoring balance after disturbance rooted indigenous grasses and forbs, Working with natural processes
Desilting a river is an ecological disturbance such as Eragrostis curvula, Themeda The design intentionally avoids symmetry
– a necessary one. It resets the system, triandra, and Chloris gayana, form a and uniform planting. Instead, vegetation
removing excess sediment that smothers living net that binds the soil. These is arranged in patterns that mirror natural
aquatic habitats and disrupts natural flow. species withstand mowing and periodic dispersal – clusters, patches, and gradients
But once cleared, the exposed banks and inundation, reducing the risk of that evolve over time. This mosaic structure
disturbed soil are vulnerable to erosion and washouts. Select shrubs and stabilisers encourages wildlife movement, seed
invasion. This is where ecological design like Carissa bispinosa (num-num) and dispersal, and microhabitat formation.
comes into play. Diospyros lycioides (bluebush) are planted
irregularly to mimic natural distribution Natural materials like rocks, logs, and brush
Rather than reintroducing rigid, manicured and add resilience through root diversity. bundles are used to create microhabitats for
landscaping, Life Green Group’s philosophy small mammals, reptiles, and amphibians.
is to guide the system back to health Picnic areas and floodplains These features slow down surface water,
using principles of natural succession and In areas where people and nature meet, allowing infiltration while adding aesthetic
indigenous vegetation. The goal is a living, the focus is on blended zones – spaces variety and ecological value.
layered ecosystem that looks natural, that feel natural yet remain safe and
functions effectively, and protects the functional. Indigenous groundcovers, Resilience through diversity
estate from future flood damage. flowering shrubs, and robust lawn species By using indigenous plant communities
create a soft edge between recreation suited to the Highveld climate, the restored
The role of vegetation in river rehabilitation and ecology. Grass management here river system will be more resilient to drought,
Healthy river systems depend on vegetation follows the principle that “healthy roots pests, and floods. Native vegetation
diversity. Each zone – from instream reeds mean healthy landscapes”, cutting no reduces maintenance needs, improves
to upland grass buffers – plays a distinct lower than one-third of the blade height water quality, and enhances biodiversity,
role in stabilising soil, filtering water and to maintain energy reserves and prevent creating a functional ecosystem that thrives
supporting wildlife. soil exposure. Seasonal wildflowers and with minimal intervention.

Fourways Gardens • 28 • December 2025