Start with water, not plants
Summer storms drop a lot of water in a short time. On the highveld's clay-rich soils that water does not soak away quickly, so it runs — usually towards the lowest structure on the property.
Before choosing a single plant, set the falls: where water enters the site, where it crosses hard surfaces, and where it leaves. Channel drains at driveway thresholds, graded lawn areas and planted swales do more for a garden's lifespan than any species choice.
- Grade hard surfaces away from buildings, never towards them
- Break up long paved runs with drainage channels
- Use gravel-backed beds and swales to slow run-off
Plant for the dry winter, not the wet summer
Anything that looks lush in February and needs weekly irrigation in July will cost you money and eventually die. Choose species that tolerate a dry, cold six months, then treat irrigation as insurance rather than life support.
Frost pockets matter: low, still corners of a property can sit several degrees colder than the rest of the garden. Keep tender species close to walls and paving that hold daytime heat.
- Favour indigenous and water-wise species for structure
- Reserve thirsty feature planting for small, high-visibility areas
- Mulch beds heavily to hold moisture through winter
Soil preparation is the real cost
Highveld clay compacts hard and drains slowly. Turning it into a growing medium means breaking it up properly and adding organic material and coarse material to open the structure.
This is the item cheap quotes leave out. A garden installed straight into unamended clay looks fine for one season and then stalls.