Soil & potting mix
Best soil for New Zealand Spinach (Spinacia oleracea 'New Zealand')
Also called New Zealand Spinach, Warrigal Greens, Kokihi.
More about new zealand spinach
About New Zealand Spinach
Spinacia oleracea 'New Zealand' · also called New Zealand Spinach, Warrigal Greens · edible
A warm-season leafy green that fills the summer gap when true spinach bolts in the heat. Trailing, succulent stems produce small, thick, arrow-shaped leaves with a mild spinach-like flavour. Heat and drought tolerant once established. Harvest shoot tips regularly to encourage bushy, continuous growth throughout summer. Matures in 55–70 days.
Preferred mix: Well-draining, fertile soil; tolerates sandy or average soils
Watch for — Poor germination: Hard seed coats inhibit germination — soak seeds in warm water for 24 hours before sowing and plant after soil warms to at least 15°C (60°F). Cold soil is the most common cause of germination failure.
Why new zealand spinach needs this mix
New Zealand Spinach is a hungry, thirsty crop — it wants a rich, moisture-retentive but free-draining loam, well fed and never baked dry.
- New Zealand Spinach grows fast and has a big crop to fill, so it draws heavily on both nutrients and water — a lean mix simply cannot keep up.
- Plenty of organic matter holds moisture evenly, which prevents the stress problems (bolting, bitterness, blossom-end rot) that come from a drying-then-flooding cycle.
- It still needs structure: rich does not mean airless, so grit, perlite or leaf mould keeps roots oxygenated.
For the full picture on what makes up a good mix, see our guide to the main types of soil and potting media — it explains why each ingredient above behaves the way it does.
What goes wrong with the wrong mix
The wrong soil is one of the most common reasons new zealand spinach struggles, and the damage often shows up weeks later as a watering problem. For this species specifically:
- A poor, thin or sandy mix starves new zealand spinach — growth stalls, leaves pale, and yields collapse.
- A heavy, compacted, badly drained soil rots the roots and brings fungal problems despite all the feeding.
- Letting a rich mix dry to dust then drowning it causes the classic moisture-stress disorders this crop is prone to.
Under-feeding and inconsistent moisture. New Zealand Spinach needs genuinely rich soil plus steady watering — most disappointing crops come down to one or both being short.
pH — does it matter for new zealand spinach?
New Zealand Spinach does best around pH 6.0-7.0 (slightly acidic to neutral). It is worth a cheap soil test for an outdoor bed; very acidic soil benefits from a little lime well before planting.
If you want to check or adjust it, the soil pH guide walks through testing and the safe ways to nudge a mix more acidic or more alkaline.
DIY mix vs a bagged one
For containers a good multipurpose or vegetable compost works for new zealand spinach with extra feed through the season. For beds, the real win is digging in plenty of well-rotted compost or manure — that beats any bag.
Drainage and the pot
Rich but free-draining is the target: raised beds and large containers both deliver it. Mulch heavily to even out moisture and roughly halve how often you water.
New Zealand Spinach is usually grown for a single season, so "repotting" means starting fresh each year — never reuse exhausted, disease-prone compost for the same crop family. When the time comes, our repotting guide for new zealand spinach covers the timing and technique step by step.
New Zealand Spinach soil — frequently asked questions
What is the best soil mix for new zealand spinach?
3 parts compost-amended loam or quality multipurpose compost : 1 part well-rotted garden compost or manure : 1 part perlite or grit (containers) / leaf mould (beds). New Zealand Spinach grows fast and has a big crop to fill, so it draws heavily on both nutrients and water — a lean mix simply cannot keep up.
Can I use normal potting soil for new zealand spinach?
A poor, thin or sandy mix starves new zealand spinach — growth stalls, leaves pale, and yields collapse. For containers a good multipurpose or vegetable compost works for new zealand spinach with extra feed through the season. For beds, the real win is digging in plenty of well-rotted compost or manure — that beats any bag.
Does new zealand spinach need a special pH?
New Zealand Spinach does best around pH 6.0-7.0 (slightly acidic to neutral). It is worth a cheap soil test for an outdoor bed; very acidic soil benefits from a little lime well before planting.
Should I buy a bagged mix or make my own for new zealand spinach?
For containers a good multipurpose or vegetable compost works for new zealand spinach with extra feed through the season. For beds, the real win is digging in plenty of well-rotted compost or manure — that beats any bag.
How often should I refresh the soil for new zealand spinach?
New Zealand Spinach is usually grown for a single season, so "repotting" means starting fresh each year — never reuse exhausted, disease-prone compost for the same crop family. Rich but free-draining is the target: raised beds and large containers both deliver it. Mulch heavily to even out moisture and roughly halve how often you water.
Keep reading
- New Zealand Spinach care — the full brief (light, water, humidity, problems, pet safety)
- How often to water new zealand spinach — the schedule the mix feeds into
- Repotting new zealand spinach — when and how to refresh the mix
- Soil pH guide — test it and adjust it safely
- Should I water my plant? The simple check first
- Why is my plant wilting? Wet vs dry diagnosis
- Underwatered plant — signs and how to rehydrate it
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- All 6887 soil and potting-mix guides in the Growli library