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Rhododendron periclymenoides (Pinxterbloom azalea)

Intermediate
skill rating
2 hours care
per year
2m
Max height
1.5m
Max spread
10-20 years
To maturity
Low
Toxicity

Plant details

Botanical name

Rhododendron periclymenoides

Other names

Pinxterbloom azalea, Rhododendron nudiflorum

Genus

Rhododendron Rhododendron

Species

R. periclymenoides - R. periclymenoides is an upright, rounded to irregular, sucking, deciduous shrub with ovate to elliptic, bright green leaves and spherical clusters of lightly fragrant, funnel-shaped, pale pink flowers in mid-spring.


Rhododendron periclymenoides is: Deciduous

Habit

Irregular, Upright

Toxicity

All parts are highly toxic if ingested.

Flower

Pale-pink in Spring

Foliage

Dark-green in Spring; Dark-green in Summer; Dark-green in Autumn

How to care

Watch out for

Specific pests

Aphids , Caterpillars , Leafhoppers , Vine weevil Aphids , Caterpillars , Leafhoppers , Vine weevil

Powdery mildew , Rhododendron bud blast , Rhododendron petal blight , Silver leaf Powdery mildew , Rhododendron bud blast , Rhododendron petal blight , Silver leaf

General care

Pruning

Deadhead regularly if practical. Pruning group 8.

Propagation

Will not come true to type from seed.

Propagation methods

Semi-hardwood cuttings, Grafting, Layering


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Where to grow

Rhododendron periclymenoides (Pinxterbloom azalea) will reach a height of 2m and a spread of 1.5m after 10-20 years.

Suggested uses

Beds and borders, City, Cottage/Informal, Specimen tree, Woodland

Cultivation

Best grown in humus-rich, sandy, moist or moist but well-drained, acid soil in partial shade. Tolerates sun in cool summer climates. Mulch in spring to maintain soil moisture. Do not allow roots to dry out or sit in standing water. Plant shallowly.

Soil type

Loamy, Sandy

Soil drainage

Moist but well-drained

Soil pH

Acid

Light

Partial Shade, Full Sun

Aspect

North, South, East, West

Exposure

Sheltered

UK hardiness Note: We are working to update our ratings. Thanks for your patience.

Hardy (H4)

Companion plants

We do not currently have companion plants added for this plant.

Botanical name

Rhododendron periclymenoides

Other names

Pinxterbloom azalea, Rhododendron nudiflorum

Genus

Rhododendron Rhododendron

Species

R. periclymenoides - R. periclymenoides is an upright, rounded to irregular, sucking, deciduous shrub with ovate to elliptic, bright green leaves and spherical clusters of lightly fragrant, funnel-shaped, pale pink flowers in mid-spring.

Native to

Eastern United States

Foliage

Deciduous

Habit

Irregular, Upright

Toxicity

All parts are highly toxic if ingested.


Colour

Flower

Pale-pink in Spring

Foliage

Dark-green in Spring; Dark-green in Summer; Dark-green in Autumn


How to care

Watch out for

Specific pests

Aphids , Caterpillars , Leafhoppers , Vine weevil

Specific diseases

Powdery mildew , Rhododendron bud blast , Rhododendron petal blight , Silver leaf

General care

Pruning

Deadhead regularly if practical. Pruning group 8.

Propagation

Will not come true to type from seed.

Propagation methods

Semi-hardwood cuttings, Grafting, Layering


Monthly care advice


Where to grow

Rhododendron periclymenoides (Pinxterbloom azalea) will reach a height of 2m and a spread of 1.5m after 10-20 years.

Suggested uses

Beds and borders, City, Cottage/Informal, Specimen tree, Woodland

Cultivation

Best grown in humus-rich, sandy, moist or moist but well-drained, acid soil in partial shade. Tolerates sun in cool summer climates. Mulch in spring to maintain soil moisture. Do not allow roots to dry out or sit in standing water. Plant shallowly.

Soil type

Loamy, Sandy

Soil drainage

Moist but well-drained

Soil pH

Acid

Light

Partial Shade, Full Sun

Aspect

North, South, East, West

Exposure

Sheltered

UK hardiness Note: We are working to update our ratings. Thanks for your patience.

Hardy (H4)

USDA zones

Zone 9, Zone 8, Zone 7, Zone 6, Zone 5, Zone 4

Defra's Risk register #1

Plant name

Rhododendron periclymenoides (Pinxterbloom azalea)

Common pest name

Ramorum leaf blight; Ramorum shoot dieback; Rhododendron twig blight; Sudden oak death

Scientific pest name

Phytophthora ramorum

Type

Oomycete

Current status in UK

Present (Limited)

Likelihood to spread in UK (1 is very low - 5 is very high)

4

Impact (1 is very low - 5 is very high)

4

General biosecurity comments

Pathogen of larch and other hosts subject to EU emergency legislation. A containment strategy is in place in the UK; reflecting its presence in wider environment/forestry settings in some areas. EU regulatory status is under review.

Defra's Risk register #2

Plant name

Rhododendron periclymenoides (Pinxterbloom azalea)

Common pest name

leaf rust of blueberry

Scientific pest name

Thekopsora minima

Type

Fungus

Current status in UK

Absent

Likelihood to spread to UK (1 is very low - 5 is very high)

4

Impact (1 is very low - 5 is very high)

3

General biosecurity comments

Rust fungus affecting blueberry and hemlock. This fungus has been detected in Europe (Germany; Netherlands and Portugal). Some uncertainty about the suitability of UK native host species. But the case for regulation should be considered based on the EPPO PRA.

Defra's Risk register #3

Plant name

Rhododendron periclymenoides (Pinxterbloom azalea)

Common pest name

pink wax scale; red was scale; ruby wax scale

Scientific pest name

Ceroplastes rubens

Type

Insect

Current status in UK

Absent

Likelihood to spread to UK (1 is very low - 5 is very high)

3

Impact (1 is very low - 5 is very high)

3

General biosecurity comments

Based on its biology and low potential impact continued action on this pest in the UK would not be considered appropriate. It is likely to be of more concern to southern Member States of the EU; as it is an economic pest of citrus.

About this section

Our plants are under greater threat than ever before. There is increasing movement of plants and other material traded from an increasing variety of sources. This increases the chances of exotic pests arriving with imported goods and travellers, as well as by natural means. Shoot is working with Defra to help members to do their part in preventing the introduction and spread of invasive risks.

Traveling or importing plants? Please read "Don't risk it" advice here

Suspected outbreak? Click here for contact details to report to the relevant authority.

Date updated: 7th March 2019 For more information visit: https://planthealthportal.defra.gov.uk/

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This plant likes... Garden match
Soil types: Loamy, Sandy Tell us...
Soil drainage: Moist but well-drained Tell us...
Soil pH: Acid Tell us...
Light: Partial Shade, Full Sun Tell us...
Aspect: North, South, East, West Tell us...
Exposure: Sheltered Tell us...
Hardiness: Hardy (H4) Tell us...

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