A biennial beet relative, per the crop database's own description, genuinely more bolt-resistant than true spinach. That resistance is the whole point: where true spinach runs to flower within weeks of warm weather, perpetual spinach keeps producing usable leaves for months from one sowing.
Water need
Wants consistent moisture to keep leaves tender through a long picking season -- much like chard, its close relative.
Calories at a glance
200 kcal/kg -- identical to chard's own figure, since it's genuinely the same crop underneath (scale is log-based across all 55 core crops in the calculator).
Temperature Range by Month
Month on the bottom, temperature up the side. The pale green background is what the plant can survive at all -- fatal above or below it, labelled directly on the chart where that applies to your zone. The coral band is its ideal range, and only fades in during the months this zone would actually have the crop in the ground -- reusing the exact same sowing/harvesting data as the calendar further down the page. The blue line is real monthly climate data (not a modelled estimate) for a representative rural/agricultural location in this zone -- a small farming town or agricultural research station rather than a major city, to avoid the warmer bias city weather stations have. For the actual verdict on how well this crop does in your zone, see the badge at the top of the page -- that's based on the site's own researched yield figures, not this chart.
Quick Start: Sowing to Storage
- Sow direct in a sunny spot. Sow direct once frost risk has passed -- perpetual spinach is genuinely easy to establish and tolerates a wide range of conditions.
- Thin to final spacing. Thin seedlings once established, giving plants enough room to bulk up into productive, long-lived clumps.
- Harvest outer leaves regularly. Pick outer leaves as needed, leaving the centre growing point intact -- this is what lets a single sowing keep producing for months.
- Keep picking through summer and beyond. Because it's genuinely bolt-resistant, keep harvesting right through summer, when true spinach would already have run to seed.
- Let plants overwinter for an early spring crop. In mild zones, established plants can survive winter and resume producing early the following spring -- a genuine living-larder crop, closer to kale than to true spinach.
Sowing & Harvesting Calendar
Pick your zone under "Temperature Range by Month" above and this updates too. Notice how much wider the harvest window runs here than for true spinach elsewhere on this hub -- a direct result of its genuine bolt resistance.
Calories & Yield
Tropical, Subtropical and Mediterranean zones tie for the best yield here, and every zone shows at least a challenging window.
| Climate Zone | Yield per plant | Calories per plant | Viability |
|---|---|---|---|
| Tropical / Humid | 2.5 kg | 500 kcal | Viable -- best yield |
| Subtropical | 2.5 kg | 500 kcal | Viable -- best yield |
| Mediterranean | 2.5 kg | 500 kcal | Viable -- best yield |
| Temperate Maritime | 2.0 kg | 400 kcal | Viable |
| Temperate Continental | 2.0 kg | 400 kcal | Viable |
| Cool / Boreal | 0.72 kg | 144 kcal | Challenging (60% yield) |
| Arid / Semi-Arid | 0.72 kg | 144 kcal | Challenging (60% yield) |
| Highland / Alpine | 0.72 kg | 144 kcal | Challenging (60% yield) |
Figures per plant sown, from the site's own crop database. Boreal, Arid and Alpine already reflect the 60% penalty applied to challenging zones.
A note on varieties: "Perpetual Spinach" is itself a single named leaf-beet strain (it's a type of chard, not true spinach -- see below), rather than a crop with its own range of named varieties.
Seed Saving -- Quick Guide
Despite the name, perpetual spinach isn't true spinach at all -- it's a leaf beet, the same species (Beta vulgaris) as beetroot and chard, and will cross with both if any are allowed to flower nearby.
SERVINGS, NOT DAILY CALORIES This works out plate-sized servings of perpetual spinach from your seed during its fresh harvest window only, not your group's full daily calorie needs. For that, use the main calculator.
BIENNIAL Perpetual Spinach is a biennial, not an annual -- it doesn't produce seed in its first year. Plants grow through year one, a few overwintered plants flower and set seed in year two, and that seed is only ready to sow in year three. If you're starting from scratch with no ongoing seed supply, that means having enough seed on hand for both year one's and year two's sowing up front. Plan for roughly double the seed quantity below if that's your situation.
Estimated for your selected zone above, using this site's own germination, loss and yield figures for perpetual spinach -- a helping is roughly what you'd put on a plate as part of a meal with other veg. Treat it as a planning estimate, not a promise.
Storage & Preservation
Fresh leaves keep for about a week refrigerated -- but because it's genuinely picked over such a long season, there's little need to store much at once.
For longer-term preservation, it blanches and freezes just as well as true spinach, keeping usable greens on hand through the leanest part of winter.
Growing Perpetual Spinach Without Bought Inputs
Genuinely one of the most trouble-free leafy crops on this hub -- its bolt resistance and toughness make it far more forgiving than true spinach.
Slugs and leaf miners are the main pests to watch, the same risk chard and beetroot face.
Hand-picking slugs at dusk and removing mined leaves promptly are simple, genuinely effective input-free measures.
Frequently Asked Questions
Is perpetual spinach really spinach?
No -- genuinely not, despite the name. Perpetual spinach is Beta vulgaris, the same species as chard and beetroot. True spinach is Spinacia oleracea, an entirely different genus. Perpetual spinach is really a leaf-only, non-bolting type of chard, grown and eaten for its spinach-like leaves.
Does perpetual spinach cross-pollinate with chard or beetroot?
Yes -- genuinely, since all three are Beta vulgaris, the same species. If you're saving seed from perpetual spinach, chard and beetroot in the same year, treat all three as one shared isolation problem, not three separate crops.
Can wild sea beet cross-pollinate my perpetual spinach?
Yes, and it's a genuine risk for coastal growers specifically. Sea beet (Beta vulgaris subsp. maritima), the wild ancestor of all cultivated beets and chards, grows prolifically on shingle, cliffs and upper beaches along Atlantic and Mediterranean coasts, and shares the same wind-pollinated system, so it doesn't need to be deliberately planted to cross with seed you're saving. If you garden near a coastline, check for flowering sea beet within your isolation distance, not just cultivated relatives in neighbouring gardens.
Why is it called "perpetual"?
Because the crop database calls it out directly: more bolt-resistant than true spinach. Ordinary spinach runs to flower quickly in heat or long daylight, but perpetual spinach keeps producing usable leaves for months without bolting, giving a much longer, more continuous harvest.