How to Grow
Spinach Perpetual from Seed
The spinach that is not spinach -- Italian chard/leaf beet (Beta vulgaris) that looks and tastes like spinach but does NOT bolt in summer heat; sow March–May and again August–September for near-year-round supply; 2cm deep; 30cm spacing; harvest outer leaves by TWISTING at the base (not cutting); rich fertile moisture-retentive soil; protect autumn sowing under fleece for winter and early spring harvests
Perpetual Spinach is one of the great naming misnomers in the kitchen garden: it is not spinach. It is a variety of Swiss chard (Beta vulgaris), closely related to rainbow chard and beetroot, selected over generations for producing smooth, relatively thin, flat-shaped leaves with slim pale stems that look and taste more like spinach than any other chard variety. In Italy, where the variety has been grown for centuries under the name "Bietola a Costa Fine" (Swiss chard with thin ribs), it is understood as a chard. In British and American kitchen gardens, the "spinach" name has stuck because the flavour and appearance are so convincingly spinach-like.
The practical value of understanding the misnomer lies in knowing why Perpetual Spinach is so much more useful in the summer garden than true spinach. True spinach bolts rapidly when temperatures rise above 20°C, ending the harvest by June in a typical UK summer. Perpetual Spinach, because it is a chard, is heat-tolerant and genuinely slow to bolt -- it continues producing harvestable leaves through July, August and September when true spinach would have been a memory. Two sowings per season provide a near-continuous supply of the mild, versatile green leaf from early spring through to late autumn and beyond.
Quick Facts at a Glance
Plant Type
NOT actual spinach -- Italian chard/leaf beet (Beta vulgaris) that tastes like spinach
Key Advantage
Slow to bolt in heat -- produces all summer when true spinach would have gone to seed
Flavour
Mild, spinach-like taste; smooth flat leaves; slim pale stems; much milder than chard
Year-Round
Two sowings (spring + August) give near-year-round supply; survives light frosts
Harvest
TWIST outer leaves off at base; do not cut (avoids diseased stumps); cut-and-come-again
Difficulty
1 out of 5 -- one of the easiest and most productive greens in the kitchen garden
Understanding the Spinach That Is Not Spinach
Not Spinach -- The Important Botanical Distinction
Perpetual Spinach is Beta vulgaris, the same species as beetroot, sugar beet and rainbow chard. True spinach is Spinacia oleracea -- an entirely different genus. This distinction matters practically because it explains the behaviour differences: true spinach bolts in heat; Perpetual Spinach, as a chard, does not. True spinach is an annual; Perpetual Spinach is a biennial that can produce for two seasons. True spinach has a stronger flavour; Perpetual Spinach is mild and versatile. Understanding these distinctions allows the kitchen gardener to use both correctly: true spinach for the early spring abundance before heat arrives; Perpetual Spinach as the heat-tolerant successor that extends the season through summer.
Two Sowings for Year-Round Supply
Two sowing dates provide near-year-round Perpetual Spinach: spring (March–May) for the summer-through-autumn supply, and late summer (August–September) for the autumn-through-spring supply. The August–September sowing is particularly valuable: plants establish through September and October, survive the winter (often with some leaf damage in hard frosts but recovering when temperatures rise), and provide fresh leaves from late February the following year -- bridging the gap between the late-autumn harvest and the first spring harvest from fresh sowings. With both sowings in place, Perpetual Spinach provides green leaf for approximately 10 months of the year in a typical UK climate.
Twist, Don't Cut -- The Correct Harvesting Technique
The correct technique for harvesting: grasp the outer leaf stem where it meets the crown, push slightly downward, then twist and pull. The leaf separates cleanly at the node without leaving a stub. Cutting with scissors or a knife leaves a short section of stem attached to the plant that provides an entry point for fungal diseases. With practice this twist technique becomes second nature and significantly improves the long-term health of the plant.
Sowing & Growing On
Sow March–May for Summer–Autumn Supply; Sow Aug–Sep for Winter–Spring Supply -- 2cm Deep -- 30cm Spacing -- Twist Outer Leaves to Harvest
Sow March–May or August–September at 2cm depth in modules (one seed per cell) or direct. Thin/space to 30cm. Rich, fertile, moisture-retentive soil. Water consistently. Harvest outer leaves by twisting at the base. Two sowings provide near-year-round supply.
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Sow March–May (spring) or August–September (late summer) at 2cm depth, one seed per module. Germination 5–10 days at 10–20°C. Each Perpetual Spinach "seed" is actually a dried fruit that can contain 2–3 seeds, so thinning after germination may be necessary. Plant out at 30cm spacing once seedlings have 3–4 true leaves.
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Choose full sun or partial shade with rich, fertile, moisture-retentive soil. Perpetual Spinach performs best in genuinely fertile soil with consistent moisture -- the deep lush leaves are nitrogen-hungry. Improve soil with compost or well-rotted manure before planting. In dry summers, water regularly to maintain leaf quality.
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Harvest outer leaves by twisting at the base rather than cutting. Grasp the outer leaf stem where it meets the crown, push slightly downward, then twist and pull. The leaf separates cleanly at the node. Harvest only the outer leaves at each visit, leaving the central leaves to continue growing -- cut-and-come-again from the outside inward.
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Protect August–September-sown plants with fleece from November for winter and early spring supply. Light frost (to -3°C) may damage the uppermost leaves but leaves the crown intact; heavier frost damages the plant more severely. Fleece covering from November provides sufficient protection for most UK winters. Remove on mild days for ventilation. Protected plants resume growth in February–March.
Growing On & Care
In the Kitchen -- The Spinach Substitute
Perpetual Spinach performs identically to true spinach in all cooked applications: sauté with butter and garlic; add to pasta sauces, risottos and soups; use as a quiche or frittata filling; add to curries and stir-fries. The mild flavour -- significantly milder than rainbow chard and almost identical to true spinach -- means it works in any application where spinach would normally be used. The slim pale stems can be included as they are tender throughout.
The Summer Green -- The Key Practical Value
By June, any true spinach sown in March or April has typically bolted and is unusable. Perpetual Spinach from the same spring sowing is still producing large, dark green, harvestable leaves through July, August and September. For kitchen gardeners who want year-round fresh greens without the gaps caused by bolting annuals, Perpetual Spinach is the essential bridge crop -- available when true spinach, rocket and other quick-bolting greens have gone to seed.
Winter Hardiness -- The Autumn–Spring Supply
As a biennial, Perpetual Spinach tolerates light frosts (to -3°C without protection, lower temperatures under fleece). An August–September sowing planted in late summer, established through autumn, and harvested through winter and early spring provides fresh green leaf at the time of year when fresh garden produce is scarcest. Winter leaves are genuinely harvestable on mild days throughout December and January with light fleece protection.
The Biennial Life Cycle
Perpetual Spinach typically lives for two growing seasons before flowering. A spring sowing produces leaf from May through October of year one, overwinters, and produces a second season of leaf from March through June of year two before flowering. Once a plant flowers it becomes less productive for leaf and can be composted. The practical approach: maintain one generation of spring-sown and one generation of late-summer-sown plants simultaneously.
Nutritional Value
Nutritionally comparable to true spinach: rich in vitamins A, C and K; containing iron, magnesium, potassium and folate; a good source of dietary fibre. The consistent availability of Perpetual Spinach -- harvestable in almost every month of the year with the two-sowing approach -- makes it a more nutritionally reliable source of these vitamins than any annual crop with a shorter productive season.
Raw in Salads -- Baby Leaves
Young Perpetual Spinach leaves (harvested at 5–8cm) are tender enough to eat raw in salads. The mild, slightly sweet flavour makes it one of the most universally acceptable salad greens -- lacking the bitterness of rocket, the assertiveness of chard, or the occasional earthiness of true spinach. Sow in a small area at close (5–10cm) spacing specifically for baby leaf harvesting.
Sowing & Harvest Calendar
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
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| Spring sow (Mar–May) |
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| Harvest from spring sow (May–Oct) |
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| Autumn sow (Aug–Sep) |
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| Harvest from autumn sow (Oct–Mar+) |
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Common Problems & Solutions
| Problem | Likely Cause | What to Do |
|---|---|---|
| Leaves becoming bitter or tough | Drought; heat; plant approaching flowering | Water consistently in dry weather. Harvest outer leaves regularly to keep the plant in active leaf production mode. If the plant flowers, remove the flowering stem immediately -- the plant may continue producing leaves for a period after removal. |
| Slug damage on young plants | Normal early-season slug pressure | Apply wildlife-friendly slug control around newly-planted seedlings until established (2–3 weeks). Once leaves are larger and tougher, slug damage reduces significantly. |
| Diseased stubs on stems | Leaves cut rather than twisted at harvest | Use the twist technique: grasp the outer leaf where it meets the crown, push down and twist to remove cleanly at the node. This leaves no stub for disease to enter. |
| Winter plant collapse | Severe frost without protection | Cover with fleece from November for reliable winter harvests. Plants killed by severe frost should be replaced by fresh spring sowings. The roots often survive below-ground even when tops are killed. |
Vegetable Specifications
The spinach that survives summer heat and winter cold -- two sowings give you fresh green leaf for most of the year
Sow March–May at 2cm depth (one per module). Space 30cm. Water consistently in dry spells. Harvest outer leaves by twisting at the base -- not cutting. Sow again in August–September and protect under fleece from November for winter–spring harvests. Two sowings provide near-year-round fresh greens from the same patch.
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