Millais Nurseries
Rhododendron oreotrephes 'Pentland' AGM
Item: SOREOTP
In stock
April-May
Dark Pink, Purple & Blue
75-100cm
Not Scented
Yes
To -15 °C
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Wonderful clone with deep mauve flowers with a paler centre in April-May. A very desirable species with beautiful sea-green foliage which is highly recommended. This selection was obtained from the Royal Botanic Gardens in Edinburgh by Peter Cox and introduced in 1990. R. oreotrephes Pentland has a tidy upright habit. Height 75-100cm in 10 years.
- Recommended for wonderful foliage.
- Easy to grow.
- Ideal position: most garden situations.
- Habit: upright.
- Group: Small Leaved Rhododendron.
- Subsection: Triflora.
- Introduction date: pre 1958 (1910), this clone in 1990.
- Species distribution: W & NW Yunnan, NE Upper Burma, SW Sichuan, SE Tibet.
- Approximate altitude: 2,750-4,900m
- Ideal soil: pH 4.5 to 6.0
- RHS Hardiness Rating: H5.
- How we usually propagate this plant: Cutting.
- Awards: RHS Award of Garden Merit, 2013.
Customer Reviews
"Hello Mark, thank you for your review. We have checked the emails but have been unable to find an email from yourself about this. If you can please send us over a photo we can have a look and advise. We suspect they are calcium deposits from the overhead irrigation, please be assured this will wash off fairly quickly once planted in the garden and we have some more rain. We look forward to the photos being sent."
Size Guide
The Basics
Ideal soil
Acidic soil, good organic content, pH 4.5-6.0. Inkarho range of rhododendrons will tolerate soils up to pH7.5
Sun or Shade
Light dappled shade is best for most varieties.
Shelter
Refer to hardiness rating. Give young plants protection.
Site Selection
Avoid close to trees, roots, invasive weeds, walls, hot patios, dry banks and waterlogged soils. Do not use weed matting or stone mulch.
Plant spacing
Use the height shown in 10 years as a guide to the distance between each plant. Allow room for plant to fill out. If planting closer for instant impact, be prepared to move plants after a few years.
Compost
- 3 litre pot, dig in 10-20 litres of ericaceous compost.
- 7.5 litre pot, dig in 20-30 litres of ericaceous compost.
- 70-80cm specimen, dig in 60 litres of ericaceous compost.
- 100-120cm specimen, dig in 120 litres of ericaceous compost.
Planting depth
Plant high in the ground, with the top of the rootball visible.
Feeding
Slow-release ericaceous feed recommended in March and straight after flowering.
Mulch
Recommended every few years.
Water
The key ingredient! Keep moist all season, especially the critical time at end of June for flower bud initiation. Tap water is better than no water. Heavy dose at least once per week in dry weather.
Drainage
Ensure good drainage in winter, especially with yellow flowering varieties. Avoid waterlogged sites.
Pruning
Rhododendrons and Camellias: Not normally required. Tidy wayward shoots after flowering.
Evergreen azaleas and Bloombux can be clipped into a low hedge.
Magnolias and Acers: Formative pruning when young to shape into a tree or bush.
Deadheading
Remove old flower-heads, particularly on young or weak plants.
For further advice see here
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