Repotting guide

When & how to repot New Zealand Spinach (Tetragonia tetragonioides)

Also called New Zealand spinach, sea spinach, warrigal greens.

More about new zealand spinach

About New Zealand Spinach

Tetragonia tetragonioides · also called New Zealand spinach, sea spinach · edible

New Zealand spinach is a sprawling, heat-loving leafy green from the fig-marigold family, unrelated to true spinach. It thrives through hot summers without bolting, producing a steady flush of thick, triangular, succulent-textured leaves where ordinary spinach fails. Pick the tender shoot tips regularly; always blanch the leaves before eating to drive off the high oxalates.

Mature size: Sprawls 1-2 m across and 20-40 cm tall; can cover a large area in one warm season.

How to tell new zealand spinach needs repotting

Repotting on a calendar is less reliable than reading the plant. For new zealand spinach, watch for these signs:

Roots growing out of the drainage holes, or the rootball lifting the plant proud of the rim.
Soil that has shrunk away from the pot sides and no longer holds water.
The pot is unstable because the plant has grown top-heavy.
Old, compacted, broken-down mix that stays wet too long — for a succulent that is a rot risk, so refresh it even if the pot size is fine.

For the underlying biology of a pot-bound root system and why it stalls a plant, see our guide to spotting and fixing a root-bound plant.

How often to repot new zealand spinach

Every 2–3 years, into bone-dry mix. New Zealand Spinach's growth habit — low, vigorously spreading and trailing branched stems forming a dense ground-covering mat of thick triangular leaves; a tender perennial grown as an annual in temperate gardens. — sets the pace. New Zealand spinach is a sprawling, heat-loving leafy green from the fig-marigold family, unrelated to true spinach. It thrives through hot summers without bolting, producing a steady flush of thick, triangular, succulent-textured leaves where ordinary spinach fails. Pick the tender shoot tips regularly; always blanch the leaves before eating to drive off the high oxalates.

What size pot to step new zealand spinach up to

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. New Zealand Spinach stores water and rots in a large pot of slow-drying soil. A tight terracotta pot that dries fast is far safer than a generous plastic one. Never up-pot a succulent by several sizes.

Not sure of the exact diameter? Our pot size calculator takes the current pot and root spread and tells you the right next size — it deliberately recommends a single step up, never a big jump.

The best time of year to repot new zealand spinach

Spring or summer, while new zealand spinach is in active growth and warm, is best — roots recover fastest then, and the plant is not sitting in cool damp soil. Avoid repotting a succulent in winter dormancy.

Step-by-step: repotting new zealand spinach

Repot dry. Do not water new zealand spinach for several days first. Working with dry roots and dry mix dramatically lowers the rot risk for a succulent.
Pick a snug, fast-draining pot. Choose terracotta one size up at most, with a drainage hole. Have gritty free-draining, moderately fertile soil, ph 6.0-7.0 ready.
Tip it out and clean the roots. Slide the plant out, crumble off the old soil, and trim any black, mushy or dead roots with clean snips.
Pot into dry mix. Set new zealand spinach at its original depth in dry gritty mix, firming gently. Do not bury the stem deeper than it was.
Wait a week before watering. Leave it completely dry and out of harsh sun for about 7 days so any damaged roots callus. Only then water lightly.

Aftercare

Keep new zealand spinach completely dry and out of fierce sun for about a week so any nicked roots callus before they meet moisture; watering a freshly repotted succulent is the classic way to rot it. Then resume the normal lean, dry rhythm. Do not fertilise for about 3 weeks — fresh mix already carries nutrients and feeding freshly disturbed roots scorches them.

The right soil mix for new zealand spinach

New Zealand Spinach wants free-draining, moderately fertile soil, ph 6.0-7.0. Adaptable and happy in poor or sandy coastal ground, but a compost-improved bed boosts leaf yield. It dislikes cold wet soil; good drainage is more important than high fertility. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting new zealand spinach — frequently asked questions

How often should you repot new zealand spinach?

Every 2–3 years, into bone-dry mix for new zealand spinach. Repot new zealand spinach every 2–3 years into a snug pot of free-draining, moderately fertile soil, ph 6.0-7.0, ideally in spring or summer. Let it sit in dry soil and do not water for about a week afterwards so any nicked roots can callus. Over-potting and watering straight away is what rots succulents.

What size pot does new zealand spinach need?

When is the best time of year to repot new zealand spinach?

Should you water new zealand spinach after repotting?

No — not straight away. Repot new zealand spinach into dry mix and wait about a week before the first watering so any damaged roots callus over. Watering a freshly repotted succulent is the single most common way to rot one.

Should you fertilise new zealand spinach after repotting?

Not immediately. Wait about 3 weeks after repotting new zealand spinach. Fresh mix already contains nutrients, and feeding freshly cut or disturbed roots burns them. Resume your normal feeding routine once you see new growth.