How to Sow and Grow Spinach: A Complete Guide
Spinach is a fast-growing cool-season leaf crop. It produces best in spring and autumn, when days are shorter and soil remains moist. Heat, crowding and drought encourage bolting, so small well-timed sowings are more useful than one large row.
Choosing spinach
True spinach varieties differ in leaf shape, mildew resistance and seasonal suitability. Savoy types have crinkled leaves; smooth types are easier to wash. Choose bolt-resistant cultivars for late spring and cold-tolerant ones for autumn. Perpetual spinach is actually a type of chard and is grown differently.
When to sow
Sow from late winter under cover, outdoors through spring, and again from late summer into autumn. Pause during the hottest part of summer unless reliable shade and irrigation are available. In mild climates, autumn sowings can overwinter under mesh or fleece.
How to sow
Sow seeds 1–2 cm deep and 3–5 cm apart in rows 25–30 cm apart. Thin gradually to 10–15 cm for mature plants, eating the thinnings. Modules are useful where slugs or poor soil make direct sowing unreliable. Transplant before roots bind.
Position and containers
Grow in sun during cool weather and partial shade as temperatures rise. Use fertile, moisture-retentive soil enriched with mature compost. Containers at least 20 cm deep work well, but must not dry out.
Watering and feeding
Water regularly to keep leaves tender and delay bolting. Mulch established plants. Fertile soil usually needs no extra feed; container crops can receive a dilute organic liquid feed if growth becomes pale. Avoid heavy nitrogen immediately before harvest.
Succession growing
Sow a short row every two to three weeks. Replace plants once flower stalks form because leaf quality quickly declines. Use summer gaps for heat-tolerant chard, then return to true spinach as nights cool.
Common problems
Bolting: sow seasonal varieties, maintain moisture and provide summer shade
Downy mildew: choose resistant varieties, improve airflow and avoid repeatedly wet leaves
Slugs and snails: protect seedlings and remove damp hiding places
Leaf miners: remove affected leaves and cover crops where the pest is persistent
Poor germination: cool the seedbed, use fresh seed and avoid saturated soil
Harvesting and storing
Pick outer leaves once large enough, leaving the centre to regrow, or cut whole rosettes just above soil level. Harvest in cool morning conditions and wash thoroughly. Spinach stores briefly refrigerated; blanch and freeze surplus soon after picking.
A reliable approach
Treat spinach as a spring and autumn crop, sow little and often, and never allow roots to dry. Switching to chard during summer avoids fighting the plant’s natural tendency to bolt.
