Trees for Soil Improvement and Erosion Control

Tree roots are the cheapest, most effective erosion control system you can plant. The right species hold sloping ground, riverbanks and bare sites while building soil over time.

How trees stabilise soil

• Anchor. Deep roots bind soil layers and resist surface movement.
• Aerate. Root networks create pores that improve water infiltration.
• Add organic matter. Leaf drop feeds the soil surface over time.

Four reliable choices

Casuarina cunninghamiana (River Sheoak)

Native to riverbanks. Deep roots stabilise erosion-prone slopes and the fine needle-like foliage filters wind. 15-20m tall.

Acacia implexa (Lightwood)

Nitrogen-fixing native. Improves degraded soils while it grows. 5-8m tall. Fast cover for bare sites.

Eucalyptus camaldulensis (River Red Gum)

Deep roots, big crown, tolerates floods and drought. 20-30m tall. The classic large-scale erosion control tree.

Banksia integrifolia (Coast Banksia)

Native dune stabiliser. Holds sandy soil against wind erosion. 6-15m tall.

Planting for erosion control

• Match species to site: river edge, slope, dune or degraded paddock.
• Plant in groups for stronger combined root mat.
• Mulch and water through year one.
• Avoid disturbance once established.

FAQs

How do tree roots prevent erosion?
They bind soil particles together and reduce surface runoff.

Which tree suits flood-prone sites?
River Red Gum and Casuarina handle wet conditions best.

Can these trees grow in smaller gardens?
Coast Banksia and Acacia suit medium-sized gardens. River Red Gum needs large open ground.