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Rhubarb

Rheum x cultorum
Edible value3Medicinal value3Other uses3
perennial1.5×2 mzone 3–9partial shade

Will it grow where I live?

Rhubarb is hardy to zone 3 – that covers all of Central Europe and the British Isles, and every USDA zone from 3 upwards.

Or check it for your location right here:

Winter hardiness by USDA zone, summer warmth by heat sum – the same values the app and the plant finder use.

Profile

Family
Polygonaceae
Habit
perennial
Height
1.5 m
Spread
2 m
Growth
very fast
Lifespan
15 years
First yield
after 3 years
Hardiness
zone 3–9
Shade tolerance
partial shade
Soil
Silt, Loam, Clay
Soil moisture
semi-dry – very moist
pH
5.9 – 8.1
Synonyms
R. undulatum. L.
suitable for hedgesground cover

Uses

Edible3 of 10
Medicinal3 of 10
Other uses3 of 10

Edible: Leaf stalk – raw or cooked. It tastes sour and is used in spring as a fruit substitute, usually boiled with sugar and made into cakes, jams etc. The juice of cooked rhubarb gives fruit punch colour and flavour. Because of the oxalic acid content, the stalks should not be consumed in large quantities – see the toxicity notes above. Unripe flowers – cooked and used like cauliflower. According to one report the plant contains 0.7% rutin. The plant part is not specified, but it is most likely the leaves.

Other uses: The leaves can be simmered in hot water to produce an insecticide.

Growing

Rhubarb is a very easy-care and undemanding plant that even tolerates neglect. It prefers deep, fertile, moderately heavy, humus-rich, moisture-retaining and well-drained soils in sunny or semi-shaded positions. It thrives in most soils provided drainage is good, and also grows in the dappled shade of trees, as long as there is enough side light. It grows well in heavy clay soils. It tolerates acid soils, but prefers a pH between 6.5 and 7. The plants are very hardy and tolerate temperatures down to at least -20°C. Hot summers, however, are not to its liking, and it can die out in warmer climate zones. Rhubarb is a long-lived and almost indestructible perennial. It is often grown for its edible leaf stalks; there are many cultivars. Most cultivars produce edible stalks from spring to early summer, with the cultivar 'Glaskin's Perpetual' being harvestable throughout the summer. By lifting the roots in autumn and exposing them to frost, earlier growth is encouraged. These roots can then be transplanted into a cold frame or other sheltered area where they form their edible stalks in late winter. Earlier outdoor harvests can also be achieved by covering the plants with a layer of straw and an upturned bucket. This species is probably a hybrid (R. rhaponticum x R. palmatum). It hybridises readily with other species of the genus. Plants of this genus appear to be immune to rabbit browsing.

Propagation

Aussaat – am besten im Herbst in einem schattigen Frühbeetkasten. Die Aussaat kann auch im Frühjahr in einem Frühbeetkasten erfolgen. Sobald die Sämlinge groß genug sind, werden sie in einzelne Töpfe pikiert und im Gewächshaus oder Frühbeetkasten überwintert. Im Frühjahr können sie dann ausgepflanzt werden. Diese Art ist eine Hybride und vermehren sich aus Samen nicht unbedingt sortenecht. Die Aussaat bietet jedoch die Möglichkeit, unter den Sämlingen besonders schöne Pflanzen auszuwählen. Teilung im zeitigen Frühjahr oder Herbst. Teilen Sie den Wurzelstock mit einem scharfen Spaten oder Messer und achten Sie darauf, dass jedes Teilstück mindestens eine Knospe hat. Größere Teilstücke können direkt an ihren endgültigen Standort gepflanzt werden. Kleinere Teilstücke sollten vor dem Auspflanzen in Töpfe gepflanzt und im Frühbeetkasten im Halbschatten vorgezogen werden, bis sie gut angewachsen sind. Im späten Frühjahr oder frühen Sommer können sie dann ausgepflanzt werden.

Origin & habitat

Steppe, open woodlands and sandy soils.

⚠️ Hazards

The leaves contain high concentrations of oxalic acid. Oxalic acid can lock up certain minerals (especially calcium) in the body, leading to nutritional deficiency. Cooking the plant will reduce the concentration of oxalic acid. Another report says that the leaves have the same concentration of oxalic acid in the stems as they do in the leaves and it is not the oxalic acid that makes them poisonous. It says that any toxic properties of the leaves is more likely to be due to the presence of glycosides. People with a tendency to rheumatism, arthritis, gout, kidney stones or hyperacidity should take especial caution if including this plant in their diet since it can aggravate their condition.

This is no substitute for expert identification. When in doubt, do not eat it.

Frequently asked questions

Rhubarb: how big does it get?

Rhubarb (Rheum x cultorum) grows as a perennial and reaches roughly 1.5 m in height when mature, with a spread of about 2 m. Growth is very fast.

Rhubarb: what site does it need?

Rhubarb tolerates partial shade. Suitable soils are Silt, Loam, Clay. Soil moisture should be in the range semi-dry – very moist. The pH may lie between 5.9 and 8.1.

Rhubarb: is it hardy?

Rhubarb is listed as hardy in zone 3–9 and survives normal winters outdoors there.

Rhubarb: will it grow in Central Europe?

Rhubarb is hardy to zone 3 – that covers all of Central Europe and the British Isles, and every USDA zone from 3 upwards.

Rhubarb: is it poisonous?

No toxicity is recorded for Rhubarb. With wild plants, never rely on a database alone — only on a confident identification.

Rhubarb: what is it used for?

Rated on a scale up to 10: Edible 3/10, Medicinal 3/10, Other uses 3/10.

Community experience

No first-hand reports for this plant yet.

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