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Great rhododendron

Rhododendron maximum
Rhododendron maximum
Edible value1Medicinal value2Other uses3
Shrub4×3 mzone 3–7partial shade

Will it grow where I live?

Great rhododendron 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
Ericaceae
Habit
Shrub
Height
4 m
Spread
3 m
Growth
slow
Lifespan
100 years
First yield
after 5 years
Hardiness
zone 3–7
Shade tolerance
partial shade
Soil
Sand, Silt
Soil moisture
semi-dry – very moist
pH
4 – 6
evergreen

Flowering & harvest

J F M A M J J A S O N D
Flowering

Times apply to the northern hemisphere in a temperate climate and shift with altitude and cultivar.

Uses

Edible1 of 10
Medicinal2 of 10
Other uses3 of 10

Growing

Halbschattiger Standort auf feuchtem, humosem, saurem und gut durchlässigem Boden. Verträgt keinen Kalk und keine Staunässe; alle Pflanzenteile sind stark giftig.

⚠️ Hazards

Toxicity: highly toxic

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

Frequently asked questions

Great rhododendron: how big does it get?

Great rhododendron (Rhododendron maximum) grows as a Shrub and reaches roughly 4 m in height when mature, with a spread of about 3 m. Growth is slow.

Great rhododendron: what site does it need?

Great rhododendron tolerates partial shade. Suitable soils are Sand, Silt. Soil moisture should be in the range semi-dry – very moist. The pH may lie between 4 and 6.

Great rhododendron: is it hardy?

Great rhododendron is listed as hardy in zone 3–7 and survives normal winters outdoors there.

Great rhododendron: will it grow in Central Europe?

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

Great rhododendron: when does it flower?

In a temperate northern-hemisphere climate it flowers from June to July.

Great rhododendron: is it poisonous?

Great rhododendron is classified as highly toxic. With wild plants, never rely on a database alone — only on a confident identification.

Great rhododendron: what is it used for?

Rated on a scale up to 10: Edible 1/10, Medicinal 2/10, Other uses 3/10.

Community experience

No first-hand reports for this plant yet.

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