Pontic rhododendron

Profile

Family

Ericaceae

Habit

Shrub

Height

5 m

Spread

8 m

Growth

slow

Lifespan

120 years

First yield

after 5 years

Hardiness

zone 6–9

Shade tolerance

full shade

Soil

Sand, Silt

Soil moisture

semi-dry – very moist

pH

4 – 6

Synonyms

R. lancifolium, R. speciosum.

Flowering & harvest

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

Uses

Edible: Highly Toxic! Translation: Highly toxic! Structured and easily readable text: This product is extremely toxic and should be handled with caution. It is important to observe all safety precautions and avoid contact with the skin or eyes. In case of accidental exposure, it is advisable to seek medical attention immediately.

Medicinal: All parts of the plant are toxic, including the Pontic honey produced from nectar and pollen, which can be highly toxic and lead to a significant decrease in pulse and heart rate. There are no known uses for this plant. The related alpine rose shrub was previously used in traditional medicine but is now only used homeopathically for rheumatism and pain. According to a study, it can even kill or paralyze bees, but not bumblebees.

Other uses: Floristry branch; Hard, strong wood for posts, carving, walking sticks; Fuel (also green); Hedges, ground cover, natural construction (at least 3 plants in a circle: outer leaf canopy, inner space); also part of cliffs.

Growing

Thrives best in humus-rich, lime-free soils, except in dry, arid soils or heavy, clayey soils. Prefers peaty or well-draining sandy loam. An ideal pH range is between 4.5 and 5.5. Tolerates both sun and shade, with more shade needed in warmer climates. The plant is hardy to about -15°C. Due to its shallow root system, it thrives best in forests but does not compete well with shallow-rooted trees. Plants must be kept free of weeds and do not tolerate well when other plants grow over or into their root system. Plants of this genus are susceptible to root rot. They form a root ball and tolerate transplanting easily as long as the root ball remains intact.

Propagation

Sow seeds in a greenhouse in autumn once ripe, providing artificial light. Alternatively, sow seeds in late winter in a slightly shaded area of a warm greenhouse or in April in a cold greenhouse. Sow seeds superficially and keep the compost from drying out. Repot seedlings when large enough and let them grow in the greenhouse for at least the first winter. Stratification in late July. Takes 15-24 months. Take cuttings from semi-hardwood in August in a frame. Challenging.

Notable

Special features: Prefers sandy, peaty, acidic soil in beech/pine forests; Also grows on steep cliffs; Mature plants can still be transplanted successfully; There are >1000 different species & countless (hybrid) varieties; Breeding focus on large-flowered varieties adapted for lime-tolerant small gardens; Different varieties = different flowering times: February - September; R. ponticum thrives "invasively" in Ireland.

Origin & habitat

Western Europe to the Caucasus and Lebanon. Naturalized in Great Britain.

Form extensive forests in mountainous areas up to 2000 meters.

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