For most Christchurch homes, a driveway, patio or path wants a proper blast every one to two years. Shaded, tree-lined or south-facing surfaces go green faster and sit at the yearly end; open, sunny concrete can stretch to two.
Signs yours is overdue
Green tinges along edges and joints, dark tyre tracks that survive rain, slippery patches underfoot after drizzle, and leaf stains that have set in — all of these mean growth has taken hold in the pores of the surface. The longer it sits, the deeper it roots and the longer the job takes.
Why not just leave it?
Beyond looks, algae on paths is a slip hazard and trapped moisture shortens the life of concrete and paver joints. A periodic blast is cheaper than repairs — and as a sole operator, I will tell you straight if your driveway can wait another season. Message via Bark with a photo and I will give you an honest answer.