In short
- A perennial — once planted, it crops in the same spot for several years.
- To prolong the harvest of young leaves, the emerging flower stems are removed regularly.
- The sour taste comes from oxalic acid; the leaves are eaten in moderation.
- Tolerates partial shade and prefers moist, humus-rich, slightly acidic soil.
- Very frost-hardy — it overwinters in the ground without protection.
- Propagated from seed or by dividing the rootstock every 3–4 years to rejuvenate it.
- Wind-pollinated and dioecious — it is not a nectar plant.
Botanical data
- Family
- Polygonaceae (Polygonaceae)
- Height
- 0.15–1 m
- Width
- 0.3–0.4 m
- Habit
- Clump-forming
- Growth rate
- Fast
- Position
- Full sun, Partial shade
- Soil
- Humus-rich, Loamy
- pH reaction
- pH 5.5–6.5
- Moisture
- Moist
- Bloom
- May–July
- Hardiness
- USDA 3a–8b
- Propagation
- From seed, By division
Characteristics
A perennial with a deep taproot and a short, branching rhizome, from which a dense ground-level rosette of leaves regrows each year. The leaves are arrow-shaped: ovate-oblong, with two sharply pointed, backward-facing lobes (auricles) at the base, succulent and smooth, borne on long stalks. The rosette usually reaches 15–30 cm in height, while in summer the plant sends up a stiff, leafy flowering stem growing to 60–100 cm. The flowers are small, gathered into a loose, panicle-like inflorescence of a greenish-red colour; the species is dioecious, and pollination occurs by wind rather than by insects. The fruit is a triangular, brown nutlet. A reddish pigmentation is typical of the stems, leaf stalks and leaf veins, intensifying in cool weather and during drought. At the base of the leaves a membranous sheath (ocrea) clasping the stem is visible — a diagnostic feature of the whole knotweed family. Sorrel is an exceptionally frost-hardy plant, overwintering as a rootstock, and it begins growth very early in late winter, providing the first green leaves before most other vegetables. The sour taste, captured in the specific epithet acetosa (from the Latin acetum — vinegar), results from the presence of oxalic acid and its salts.
Popular cultivars
- ‘De Belleville’
- Classic French large-leaved variety (Oseille de Belleville), the most commonly grown cultivar of garden sorrel. It produces broad, tender leaves that are less sour than the wild form, regrows well after cutting and is frost-hardy.
- ‘Blonde de Lyon’
- French variety with large, light-green, fleshy leaves and a milder, less sharp taste. Valued for its high yield and frost resistance; works well in soups and sauces.
- ‘Profusion’
- A variety with strongly limited flowering (it practically does not bolt into flower or set seed), propagated vegetatively. Thanks to this it produces young leaves throughout the season without the need to keep removing flowering stems, and it does not self-seed in the garden.
Growing and care
Watering
The deep taproot lets the plant survive drought, but the leaves are then smaller, tougher and more sour. Constant soil moisture gives a more abundant crop of tender leaves; in hot weather it is worth mulching.
Fertilizing
Moderate nitrogen feeding stimulates the regrowth of young leaves; excess nitrogen, however, lowers the flavour and increases the nitrate content.
Planting
A sunny or lightly shaded position, humus-rich, moist soil with a slightly acidic reaction; enrich with compost before planting.
Pruning
Systematically cut out the emerging flowering stems at the base — this inhibits flowering and stimulates the plant to produce new, tender leaves.
Companion plants
Good companions
Niska rozeta szczawiu i płytko plonująca truskawka nie konkurują silnie o światło, a obie lubią wilgotną, próchniczną glebę.
Kwaśny szczaw bywa sadzony na obrzeżach warzywnika jako roślina okrywająca glebę między wolniej rosnącymi kapustnymi.
The evidence level indicates whether the relationship is backed by research, observation, or gardening tradition.
Diseases and pests
Rusty-orange to brown, powdery clusters of spores on the underside of leaves, matched on the upper side by yellow spots. Heavily infected leaves turn yellow and drop prematurely, and the plant weakens. It affects roses and mallows among others, and some rusts have an alternate host (for example pear rust and juniper). The pustules (clusters of summer spores, the so-called uredinia) break through the leaf skin and release an orange-rust powder that rubs off onto the finger - this is the most reliable identifying feature. In high summer they appear mainly on the underside of the blade, along the veins and on the leaf stalks, and in some species also on green shoots and sepals. In late autumn the clusters darken to brownish-black - these are the overwintering spores (telia) by which the fungus survives winter on plant debris. Rusts are highly host-specific: a given rust usually infects only one species or genus of host, which is why the rusts of rose, mallow and marsh mallow, bean, leek and garlic, mint, pelargonium or lawn are different, non-interchangeable fungi. The general symptom - yellowing and premature leaf drop - weakens the plant and limits flowering and yield, though it rarely kills it within a single season.
AphidsSmall (1–3 mm) soft-bodied insects, green, black or pink, feeding in clusters on young shoots and the underside of leaves. They excrete sticky honeydew. The diagnostic feature that distinguishes aphids from other small sucking insects is the pair of siphunculi (tubular projections) at the rear of the abdomen together with a tail-like cauda; a single colony usually holds wingless forms (parthenogenetic females) alongside winged migrants that fly onto new plants in summer. In summer aphids reproduce parthenogenetically and viviparously over many generations, so the population builds up explosively; in autumn many species produce a sexual generation that lays overwintering eggs on the host, and host-alternating species move between a winter host (often a tree or shrub) and a summer host (a herbaceous plant). Feeding symptoms include curling, crinkling and distortion of young leaves, stunted growth, yellowing, and the shedding of buds and fruitlets. Abundant honeydew coats the leaves, and the sooty mould fungus that develops on it forms a black film which limits photosynthesis; the honeydew is fed on by ants, which in return defend the colony against predators. Aphids are also important vectors of plant viruses (mosaics among them), transmitting them from plant to plant even during a brief probing puncture.
Slugs and snailsSlugs and shelled snails that feed at night and after rain. Symptoms: irregular holes in the leaves and young seedlings eaten off completely, silvery slime trails on leaves and soil. The greatest damage occurs in damp, shaded spots — particularly on lettuce, strawberries and hostas. The most damaging in gardens are the slugs (which lack an external shell): the Spanish slug (Arion vulgaris, formerly described as A. lusitanicus) and the grey field slug (Deroceras reticulatum). The leopard slug (Limax maximus) can be morphologically similar to them, but it feeds mainly on decaying organic matter and fungi and may even prey on other slugs, so it is of little importance as a pest of living plants. Shelled forms — grove snails (Cepaea) or the protected Roman snail (Helix pomatia) — usually cause less damage. The body is soft, elongated and permanently covered in slime; on the head there are two pairs of retractable tentacles — the longer upper pair bears the eyes, the shorter lower pair serves a tactile and olfactory function. Slugs and snails are hermaphrodites: they lay spherical, transparent or pearly eggs in clusters, hidden in damp soil, under stones and in leaf litter. A single Spanish slug can lay several hundred eggs; both eggs and young slugs overwinter, and feeding lasts from spring to late autumn, intensifying on warm, damp nights. The damage has smooth edges and often appears in the middle of the leaf blade, not only from the margin; seedlings and transplants are sometimes eaten down to bare soil, and on strawberries and ripening vegetables the slugs gnaw hollows into the fruit. The decisive diagnostic sign is the dried, silvery glistening slime trail — no insect leaves one.
Toxicity
| For whom | Level | Notes |
|---|---|---|
| Humans | Mild | The leaves contain oxalic acid and oxalates. In normal culinary portions they are safe, but eaten in large amounts or raw they can irritate the digestive tract and promote kidney stones. Boiling and pouring off the water reduces the oxalate content. Caution is advised for people with kidney disease, rheumatism and gout. |
| Horses | Moderate | Large amounts of oxalates in feed can lead to disturbances of calcium metabolism and symptoms of poisoning in horses and other livestock. |
| Dogs | Moderate | Soluble oxalates — eating large amounts of the leaves can irritate the digestive tract and disturb calcium metabolism; occasional contact is usually harmless. |
| Cats | Moderate | Soluble oxalates — eating larger amounts can irritate the digestive tract and strain the kidneys; occasional contact is usually harmless. |
History and origin
Sorrel was known as a useful plant already in antiquity — it was valued in Egypt, Greece and Rome both as a refreshing vegetable and as a remedy for fever and loss of appetite. In medieval Europe it was one of the basic leafy vegetables gathered from meadows and grown in kitchen gardens, before it was displaced by spinach and other milder-tasting plants. It gained a special place in French cuisine, where soup made from young leaves (soupe à l'oseille) and sorrel sauce for fish and eggs became classics; it was also French gardeners who selected the large-leaved cultivated varieties. In Central European cuisine, including Polish, spring sorrel soup — most often served with a hard-boiled egg — remains a traditional dish, and the leaves of wild sorrel from meadows were gathered for generations as a seasonal source of fresh greens after winter. In old folk medicine the juice and infusion of sorrel were used as a cooling, diuretic and antiscorbutic remedy, though modern dietetics approaches this cautiously because of the high oxalate content.
Uses
Grown for its young leaves, which are harvested throughout the season and used in the kitchen: for sorrel soup, sauces, spreads, salads and as an accompaniment to eggs and fish. It is sown directly into the ground from April to May or in late summer, at a depth of about 1 cm, in rows spaced 25–35 cm apart; it can also be propagated by dividing an older rootstock in early spring. It grows best in a sunny or lightly shaded position, in humus-rich, moist and slightly acidic soil. The key care task is the systematic cutting of the emerging flower stems — after flowering the leaves become small, tough and more bitter-sour, and removing the inflorescences keeps the plant in the phase of producing tender leaves and prolongs cropping. The outer leaves are harvested, leaving the heart of the rosette to keep regrowing. Every 3–4 years it is worth dividing and transplanting the rootstock, because older plants crop more weakly and flower more readily. Because of the oxalic acid content the leaves are eaten in moderation, and boiling and pouring off the water reduces the amount of oxalates; caution is advised for people with kidney stones, gout and kidney disease. Sorrel also does well in a large pot, and thanks to its early start into growth it provides fresh greens at a time when no other vegetables are yet available in the garden. If not deliberately propagated it easily runs wild and self-seeds, which is why unwanted inflorescences are removed before the nutlets ripen.
Trivia
- The specific epithet acetosa comes from the Latin acetum, meaning vinegar — a reference to the sour taste of the leaves.
- Sorrel is a dioecious and wind-pollinated plant: male and female specimens grow separately, and the pollen is carried by the wind, not by insects.
- The leaves are a host plant for the caterpillars of the small copper (Lycaena phlaeas) and related butterflies.
- The sour taste and the potential harm in excess are due to the same compound — oxalic acid, which binds calcium into insoluble oxalates.
Frequently asked questions
Is sorrel poisonous?
Not in normal culinary portions. The leaves do, however, contain oxalic acid and oxalates, which in large amounts — especially raw — irritate the digestive tract and promote kidney stones. Boiling and pouring off the water lowers the oxalate content. Caution is advised for people with kidney disease, gout and rheumatism, as well as when feeding livestock.
Why do sorrel flower stems have to be removed?
Once it bolts into flower, the plant switches to producing seed, and the leaves become small, tough and more sour. Systematically cutting the flowering stems at the base keeps sorrel in its leafy phase, prolongs the harvest of tender leaves and prevents uncontrolled self-seeding.
How long does sorrel grow in one spot?
It is a perennial that crops for several years. It gives the best harvests during the first 3–4 years; after that the plants weaken and flower more readily, which is why it is worth dividing the rootstock and transplanting it into fresh soil enriched with compost.
When should sorrel leaves be harvested?
The tastiest are young leaves harvested in spring and early summer, before the plant bolts into flower. The outer leaves are picked, leaving the heart of the rosette to keep regrowing; with regular removal of the inflorescences the harvest can be carried out throughout the season.
Is garden sorrel the same plant as wild sorrel from the meadow?
Yes — the garden vegetable and the common meadow sorrel are the same species, Rumex acetosa. Cultivated varieties (e.g. the large-leaved French selections) have larger, more tender and less sour leaves than the wild form, but botanically it is the same plant. Note: bloody dock (Rumex sanguineus) and buckler-leaved sorrel (Rumex scutatus) are separate species.
Sources
- Plants of the World Online (POWO) — Rumex acetosaDatabase (GBIF, POWO…)
- RHS — SorrelInstitution / botanical garden
- Rośliny warzywne — uprawa i wartość użytkowa (PWRiL)Book
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