Caper Bush: A Drought-Tolerant Native

Climate zone: Hot-summer Mediterranean, USDA 8b–11 ·Watering needs: None once established; tolerates full summer drought · Capparis spinosa

The caper bush drought tolerant reputation isn’t marketing — it’s a plant that grows wild out of vertical cracks in stone walls with zero soil to speak of and no water beyond whatever rain falls, which on this coast is close to nothing for five months of the year.

Where it grows here

I didn’t plant my first caper bush. It arrived on its own, seeded into a gap in the same kind of dry stone wall described in our terrace-building guide, and it’s been there for six years without a drop of irrigation. That’s the plant’s natural habitat — rock crevices, old walls, poor thin soil — anywhere with sharp drainage and full sun.

Growing one deliberately

If you’d rather not wait for a bird or the wind to plant one for you, take a semi-hardwood cutting in early summer, strip the lower leaves, and push it into a gritty, fast-draining mix. Rooting is slow and unreliable compared to most garden plants — expect to lose more cuttings than you keep. Once rooted and planted out, water for the first season only, then stop entirely. Established caper bushes resent regular watering more than they resent none at all.

Harvesting the buds

The flower buds, picked before they open and cured in salt or brine, are the caper of the kitchen. I pick every two or three days through late spring and early summer, since a bud left too long opens into a flower and is no longer usable. It’s a plant that asks for almost nothing and, in the right week, gives back a harvest daily — a fair trade on ground this dry.

A good neighbour for other dry-loving plants

Because it needs so little and roots so shallowly in rubble and cracks, a caper bush rarely competes with anything planted nearby for water. I tuck them along the base of walls and the edges of raised beds where nothing else would take hold, including near the same dry-farmed vegetable beds described elsewhere on this site — different rooting depths mean they simply aren’t drawing from the same reserve of soil moisture at all.