Millais Nurseries
Rhododendron traillianum dictyotum 'Kathmandu'
Item: STRAILDK
Unavailable
April-May
White
To -20 °C
75-100cm
Not Scented
Yes
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(TALIENSIA H7) White flowers with a crimson blotch and crimson spots on the upper lobe, upright truss. April - May. This is a handsome foliage plant with dark green pointed leaves, and thin felty continuous cinnamon coloured indumentum on undersides. Height 75-100 cm in 10 years, growing eventually to around 3-4 metres tall.
Selected by Exbury Gardens, (EX2907) and received AM in 1965.
Rhododendron traillianum dictyotum 'Kathmandu' is not a good name, as the species is found growing between 3400-4300 metres in SE Tibet, NW Yunnan, and SW Sichuan, but it does not grow in Nepal!
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.
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
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