In brief: Sandy soil can be improved, but lasting results usually come from treating soil structure, water movement, mulch and planting as one system.
Why Perth sand needs a different approach
Much of Perth's coastal plain has deep, fast-draining sandy soil. Water and soluble nutrients may move beyond shallow roots quickly, while dry areas can become difficult to wet evenly. Adding plants without preparing the growing area can repeat the same cycle of stress and replacement.
Begin with the condition of the site
Check whether water soaks in evenly or runs away, where sun and coastal wind are strongest, and whether existing irrigation reaches the root zone. Plant decline can have more than one cause, so soil improvement should not be treated as a single-product cure.
Organic matter and soil improvers
Well-composted organic matter can help sandy soil retain moisture and nutrients. Suitable clay-based soil improvers may also be considered. Products and rates should be selected for the intended planting and applied according to their directions; more is not automatically better.
Wetting agents, mulch and watering
A suitable wetting agent may help where dry soil repels water. Mulch can reduce evaporation and temperature swings, while irrigation should deliver water to the correct zone without encouraging waste. These measures work best as part of a planned improvement rather than isolated treatments.
What should happen before planting?
- Identify drainage, exposure and irrigation issues.
- Remove weeds and unsuitable material.
- Prepare the planting zone rather than a tiny planting hole.
- Incorporate suitable amendments where required.
- Choose plants for the finished conditions.
- Mulch and establish an appropriate watering routine.
When should you request an assessment?
Consider professional input when a large area repeatedly fails, irrigation and soil issues overlap, or the project involves a broader redesign. A site assessment can help avoid spending on plants before the foundation is ready.