Picea mariana 'Nana' ( Dwarf black spruce)

Botanical name

Picea mariana 'Nana'

Other names

Dwarf black spruce

Genus

Picea Picea

Variety or Cultivar

'Nana' _ 'Nana' is a slow, low growing, evergreen, coniferous shrub with grey-green, needle-like foliage.

Foliage

Evergreen

Habit

Dense, Rounded to broadly spreading

Awards

RHS AGM (Award of Garden Merit)

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Colour

Foliage

Grey-green in All seasons

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How to care

Watch out for

Specific pests

Aphids , Pineapple gall adelgid on spruce trees , Red spider mite (box and other)

Diseases

Generally disease free.

General care

Pruning

No pruning required

Propagation methods

Grafting, Hardwood cuttings, Seed

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Monthly care advice

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Where to grow

Picea mariana 'Nana' ( Dwarf black spruce) will reach a height of 0.5m and a spread of 0.5m after 10-20 years.

Suggested uses

Architectural, City, Cottage/Informal, Low Maintenance, Rock

Cultivation

Grow in moist, free-draining soil in full sun. This plant thrives in acidic soil but will tolerate some alkalinity.

Soil type

Clay, Loamy, Sandy

Soil drainage

Moist but well-drained, Well-drained

Soil pH

Acid, Neutral

Light

Full Sun

Aspect

North, South, East, West

Exposure

Exposed, Sheltered

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

Hardy (H4)

USDA zones

Zone 7, Zone 6, Zone 5, Zone 4, Zone 3

Defra's Risk register #1

Plant name

Picea mariana 'Nana' ( Dwarf black spruce)

Common pest name

Scientific pest name

Ips subelongatus

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)

5

General biosecurity comments

Pest of conifers with EU regulation helping to mitigate against the entry on conifer wood from non-European sources. Also present in European Russia with a similar range to Ips typographus; for which the UK has a protected zone with requirements on conifer wood.

Defra's Risk register #2

Plant name

Picea mariana 'Nana' ( Dwarf black spruce)

Common pest name

Dothistroma needle blight; Red band needle blight

Scientific pest name

Dothistroma septosporum

Type

Fungus

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)

5

General biosecurity comments

Fungal pest of pine; already present in UK of particular concern in Scotland

Defra's Risk register #3

Plant name

Picea mariana 'Nana' ( Dwarf black spruce)

Common pest name

Hemlock caterpillar; Japanese

Scientific pest name

Dendrolimus superans

Type

Insect

Current status in UK

Absent

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

1

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

5

General biosecurity comments

Pest of conifers currently only known from Asia where it can cause significant defoliation. Potential pest on European conifer species; and consideration should be given to regulation at an EU level.

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