Rhododendron arboreum 'Stonefield Best'

Rhododendron arboreum 'Stonefield Best'

Item: SARBSTO

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Flowering Month:
April
Flower Colour:
Red
Hardiness:
To -10 °C
Height After 10 Years:
150-175cm
Scent:
Not Scented
Interesting Foliage:
No
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(ARBOREA  H4)  Red flowered form.  Flowering March-April.  Silvery to red indumentum.  The National flower of Nepal that will become a large tree in time. It makes a majestic plant that has the ability to re-grow from both the base and the trunk after a hard winter's removed. Height 150cm in 10 years.
Characteristically, as with some species, this plant does need woodland shelter and it does have lovely foliage but you will need to wait about six years before it flowers, we think the wait is worthwhile!

  • Recommended for wonderful foliage.
  • Easy to grow in mild areas.
  • Ideal position: sheltered woodland.
  • Habit: tree-like.
  • Group: Species Rhododendron.
  • Subsection: Arborea.
  • Introduction date: pre 1850 (probably 1809).
  • Species distribution: Kashmir, Punjab, Uttar Pradesh, Nepal, Sikkim, Bhutan, Assam.
  • Approximate altitude: 1,200 to 3,350m.
  • Ideal soil: pH 4.5 to 6.
  • RHS Hardiness Rating: H5.
  • How we usually propagate this plant: Seed.

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 varieties. Avoid waterlogged sites.

Pruning

Not normally required. Tidy wayward shoots after flowering. Evergreen azaleas and Bloombux can be clipped into a low hedge.

Deadheading

Remove old flower-heads, particularly on young or weak plants.


For further advice see here

Size Guide

Size guide

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