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Rhododendron Cynthia  AGM 'Seconds'

Rhododendron Cynthia AGM 'Seconds'

Item: HCYN

in stock In stock

Flowering Month:
Flower Colour:
To -20 °C
Height After 10 Years:
Not Scented
Interesting Foliage:
7.5 litre
Available stock: 6
£35.95 £18.00
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This item is available for collection.

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UK mainland delivery from £8.95

Please note these plants are seconds, so not first grade, slightly mis-shaped and may or may not have flower buds.

A lovely old hybrid with strong rosy crimson flowers with extensive darker markings in a large conical truss. This is a popular variety flowering in May-June. It is very vigorous and grows into a huge dome shaped bush. Height 180-200cm in 10 years.

  • Recommended for: Hedging/screening.
  • Easy to grow.
  • Ideal position: Most garden situations.
  • Habit: Dense.
  • Group: Hardy Hybrid.
  • Parentage: catawbiense (s) X griffithianum.
  • Hybridization date: pre 1900 (1856).
  • Bred by: Standish & Noble. Origin: British.
  • Tolerant of more sun and heat.
  • Ideal soil: pH 4.5 to 6.
  • RHS Hardiness Rating: H6.
  • How we usually propagate this plant: Cutting.
  • Awards: RHS Award of Garden Merit.

Customer Reviews

By on
"Strong healthy plants received. Super speedy resolution of a query. Very impressive service."
Star Rating 5
By on
"The nursery went all out to fulfil my special request, I can't thank them enough for all their help and quick delivery service."
Star Rating 5
By on
"Plants arrived well protected and looked really healthy "
Star Rating 5
By on
"I purchased a number of plants and all received in great condition!"
Star Rating 5
By on
"First class plants delivered on time"
Star Rating 5
By on
"I ordered this rhododendron for a Christmas present and was absolutely chuffed to bits with it. Came in excellent condition and was well packed. Would definitely buy from them again."
Star Rating 5
By on
"The rhododendron arrived in perfect condition. It was well packaged and the plant itself was bigger than expected - good! Even before it has any flowers, it is quite lovely."
Star Rating 5
By on
"strong healthy plant would definitely recommend"
Star Rating 5
By on
"Beautifully healthy plant with lots of growth on it. Was impressed by speed of delivery, but would welcome a bit more communication about timeslot when it will arrive so I can plan time off work. Product was lovely though. Just the right size for the space in our border (7.5 litre pot). "
Star Rating 5
By on
"The Rhododendron "Cynthia" we received from Millais Nurseries was in superb and healthy condition and was carefully and safely packed. I hope we can do it justice!"
Star Rating 5
By on
"Very good healthy plant"
Star Rating 4
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"Love this rhododendron we have one already and it is an absolute picture when in flower. New one arrived in good condition and is thriving"
Star Rating 5
By on
"This plant and all others ordered arrived very well packed and in swift time. We have planted out but none will flower this year - they were not expected to. I have a Cynthia Rhododendron which has been planted 35 years and is spectacular each year. Hardy and floriferous. A bright deep pink. This plant is at the edge of conifers and has grown to about 3-4 meters Spectacular. "
Star Rating 5
By on
"My order for Rhododendron Cynthia arrived promptly, the plants are excellent. All the previous rhododendrons bought from Millais are consistently very good."
Star Rating 5
By on
"Excellent quality plant delivered promptly"
Star Rating 5
By on
"I was very pleased with all 3 rhododendron plants. They were very healthy and I’m sure they will make an excellent spring display once mature"
Star Rating 5
By on
"Excellent plant, settled in well & growing happily. Many thanks."
Star Rating 5
By on
"Excellent "
Star Rating 5
By on
"I purchased 5 Rhododendron Cynthia recently. They arrive to my home in Ireland very promptly, very secure & well boxed. The plants were very sturdy & healthy. I was delighted with them. They have now been planted & i'm looking forward to them growing & thriving, with a little a help from a few rolls of chicken wire to keep the rabbits away! I was very happy overall with the service provided & will definitely use Millais Nursuries again & recommend them to others."
Star Rating 5

Good to know

Our best-selling Rhododendrons, ideal for hedges, screening and large displays, growing to 125-200cm in 10 years.

Most of these plants can be described as ‘Hardy Hybrids’, the tough dense plants which are ideal for hedging and screening, or for planting within a border. Some can even be described as ‘Ironclads’ – tough plants that will withstand temperatures of below -20°C, and the coldest European winter. With care, it is possible to select varieties which flower from January until June, with flower trusses in a wide range of colours. With their dense downward pointing leaves, recent research has shown that they reflect sound waves and create some of the best natural sound barriers. They will take sun or shade, but dappled is best. Most hardy hybrids will bud up and flower as a 5 or 7.5 litre plant.

Also in this section are more tender varieties with delicate bell-shaped flowers that hang in small clusters, and sparser foliage. These are better suited to the more sheltered woodland garden, where they can add great character without creating dense plantings. Some woodland types have a more upright and open tree-like habit, so are not suited for screening purposes, but make great focal plants in the garden. Yellow and orange flowering varieties are always slower growing and more fussy, requiring excellent drainage. You won’t find these special plants in a garden centre, and they may take a year or so longer before they start flowering, but they will grow into choice long term plants.

Those flowering from December to March often flower erratically through the winter, with blooms opening in succession. This means that at least some blooms will avoid the frosts, and give some welcome flower to brighten up a winter’s day. Trees with overhead canopy can give a few degrees of frost protection to the flowers. Late flowering varieties also benefit from tree canopy to provide shade during the summer months when the sun is that much stronger.

Rhododendrons like moist acidic soil, with good drainage, and plenty of organic matter such as leaf-mould and added ericaceous compost. Plant no deeper than the top of the rootball, and dig in plenty of good ericaceous compost around the sides.  For a guide to plant spacing, use the height we give in 10 years as a guide to the distance between each plant. Spacing can be closer when planting a hedge, or if you are impatient. For planning a border, spacing should be one plant per 3-4m². Give a teaspoon of slow-release feed at the 5 litre size, rising to a handful full for mature plants. Tall hybrid rhododendrons are not typically damaged by deer or rabbits. They are not recommended for container growing, which they would outgrow in a few years.

Please note: Some varieties are wider than their height. Specimen size plants (eg 80-90cm) will be measured by their largest measurement which could be the spread of the plant.

For further advice, For further advice, see here

Size Guide

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.


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.


  • 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.


Slow-release ericaceous feed recommended in March and straight after flowering.


Recommended every few years.


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.


Ensure good drainage in winter, especially with yellow flowering varieties. Avoid waterlogged sites.


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.


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

For further advice see here

Delivery & Returns

Our website calculates the delivery charge according to weight and delivery location throughout the UK. To see these charges, please enter your postcode at the checkout, and you will see the charge vary as you add more items to your wheelbarrow.

Please see here for delivery information

Please see here for cancellation and return information