Weeds are one of the most persistent, low-grade nuisances in a New Zealand garden, and dealing with them well is less about a single fix and more about combining a few complementary habits.
Mulching is the best ongoing suppression tool available, since a layer of mulch blocks light from reaching weed seeds sitting in the top few centimetres of soil and stops many of them germinating in the first place. This site's dedicated mulching guide covers moisture retention, temperature moderation and the different mulch types that suit a New Zealand garden in full; the short version for weeds is that a well-mulched bed grows dramatically fewer of them than bare soil, and any that do come up through a mulch layer pull far more easily than they would from compacted, uncovered ground.
Hand-weeding is still the most reliable direct method, and timing matters more than effort. Pull weeds while they're small, ideally before they've had a chance to flower and set seed. A single weed left to mature can drop hundreds of seeds back into the soil, turning one afternoon's missed weeding into years of repeat germination from the same patch. Little and often beats a big once-a-season clearout for exactly this reason.
A single weed left to mature can drop hundreds of seeds back into the soil, turning one afternoon's missed weeding into years of repeat germination from the same patch.
New Zealand gardens carry a specific set of persistent perennial weeds that behave differently to annual weeds and need a different approach. Oxalis, wandering willie (tradescantia) and convolvulus (bindweed) are the classic examples. All three regrow readily from any piece of root, rhizome or stem fragment left behind in the soil, so a quick surface pull that snaps the top off and leaves the root system intact doesn't remove the plant, it just delays it. These need the full root system dug out, not a one-off pull, and persistence over several seasons is often required before a bad infestation is properly gone, since missed fragments keep resprouting.
Finally, be careful not to reintroduce the problem through your own green waste or compost. Weeds that have already gone to seed, and the root fragments of perennial weeds like oxalis, wandering willie and convolvulus, can survive in a home compost heap that never gets hot enough for long enough to kill them, since an average backyard heap generally doesn't reach those temperatures reliably. Putting seeding or perennial weeds into compost that isn't heating properly just spreads them straight back through the garden in the finished product. Diseased material and weed seed are both safer sent to a municipal green waste collection, which reaches higher, more sustained temperatures, than added to your own heap.