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Magnolia grandiflora (Bull bay)

Beginner
skill rating
1 hour care
per year
15m
Max height
15m
Max spread
20-50 Years
To maturity

Plant details

Botanical name

Magnolia grandiflora

Other names

Bull bay, Loblolly magnolia, Southern magnolia, Great laurel-leaved magnolia, Large-flowered magnolia, Laurel magnolia

Genus

Magnolia Magnolia

Species

M. grandiflora - M. grandiflora is an evergreen, rounded tree with a dense cover of glossy green to dark green leaves. In summer until autumn it bears fragrant, bowl-shaped white flowers.


Magnolia grandiflora is: Evergreen

Fragrance

Flower

Tree shape

Rounded

Flower

Cream in Summer; Cream in Autumn

Foliage

Dark-green in All seasons

How to care

Watch out for

Specific pests

Capsid bug , Horse chestnut scale , Snails Capsid bug , Horse chestnut scale , Snails

Coral spot Coral spot

General care

Pruning

Pruning group 13 if wall trained.

Propagation methods

Budding, Grafting, Layering, Semi-hardwood cuttings


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Where to grow

Magnolia grandiflora (Bull bay) will reach a height of 15m and a spread of 15m after 20-50 Years.

Suggested uses

Architectural, City, Cottage/Informal, Low Maintenance

Cultivation

Plant in moist, humus-rich soil. Tolerates dry, alkaline soil Some protection may be needed from late winter frosts. Can be wall-trained.

Soil type

Chalky, Clay, Loamy, Sandy (will tolerate most soil types)

Soil drainage

Moist but well-drained, Well-drained

Soil pH

Acid, Alkaline, Neutral

Light

Partial Shade, Full Sun

Aspect

South, East, West

Exposure

Sheltered

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

Hardy (H4), Tender in frost (H3)

Companion plants

Botanical name

Magnolia grandiflora

Other names

Bull bay, Loblolly magnolia, Southern magnolia, Great laurel-leaved magnolia, Large-flowered magnolia, Laurel magnolia

Genus

Magnolia Magnolia

Species

M. grandiflora - M. grandiflora is an evergreen, rounded tree with a dense cover of glossy green to dark green leaves. In summer until autumn it bears fragrant, bowl-shaped white flowers.

Foliage

Evergreen

Fragrance

Flower

Tree shape

Rounded


Colour

Flower

Cream in Summer; Cream in Autumn

Foliage

Dark-green in All seasons


How to care

Watch out for

Specific pests

Capsid bug , Horse chestnut scale , Snails

Specific diseases

Coral spot

General care

Pruning

Pruning group 13 if wall trained.

Propagation methods

Budding, Grafting, Layering, Semi-hardwood cuttings


Monthly care advice


Where to grow

Magnolia grandiflora (Bull bay) will reach a height of 15m and a spread of 15m after 20-50 Years.

Suggested uses

Architectural, City, Cottage/Informal, Low Maintenance

Cultivation

Plant in moist, humus-rich soil. Tolerates dry, alkaline soil Some protection may be needed from late winter frosts. Can be wall-trained.

Soil type

Chalky, Clay, Loamy, Sandy (will tolerate most soil types)

Soil drainage

Moist but well-drained, Well-drained

Soil pH

Acid, Alkaline, Neutral

Light

Partial Shade, Full Sun

Aspect

South, East, West

Exposure

Sheltered

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

Hardy (H4), Tender in frost (H3)

USDA zones

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

Defra's Risk register #1

Plant name

Magnolia grandiflora (Bull bay)

Common pest name

Japanese long scale; Japanese maple scale; Long scale; Japanese; Pear white scale

Scientific pest name

Lopholeucaspis japonica

Type

Insect

Current status in UK

Absent

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

2

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

4

General biosecurity comments

Regulated only on Citrus at present; regulation on other hosts needs to be considered. Only likely to be a pest under glass in UK.

Defra's Risk register #2

Plant name

Magnolia grandiflora (Bull bay)

Common pest name

Scientific pest name

Phytophthora kernoviae

Type

Oomycete

Current status in UK

Present (Limited)

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

2

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

4

General biosecurity comments

Pathogen of certain tree and shrub species; subject to a containment strategy the UK.

Defra's Risk register #3

Plant name

Magnolia grandiflora (Bull bay)

Common pest name

Black timber bark beetle; Smaller alnus bark beetle; tea root borer

Scientific pest name

Xylosandrus germanus

Type

Insect

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)

3

General biosecurity comments

Ambrosia beetle affecting a wide range of trees and woody hosts. Widespread in Europe and elsewhere and now present in the south of England. Impacts can be reduced by good silvicultural practices. Surveillance is being carried out to better determine distribution.

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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Magnolia grandiflora

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This plant likes... Garden match
Soil types: Chalky, Clay, Loamy, Sandy (will tolerate most soil types) Tell us...
Soil drainage: Moist but well-drained, Well-drained Tell us...
Soil pH: Acid, Alkaline, Neutral Tell us...
Light: Partial Shade, Full Sun Tell us...
Aspect: South, East, West Tell us...
Exposure: Sheltered Tell us...
Hardiness: Hardy (H4), Tender in frost (H3) Tell us...

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