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Sidalcea 'William Smith' (Prairie mallow 'William Smith')

Beginner
skill rating
1 hour care
per year
0.9m
Max height
0.5m
Max spread
2-5 years
To maturity

Plant details

Botanical name

Sidalcea 'William Smith'

Other names

Prairie mallow 'William Smith'

Genus

Sidalcea Sidalcea

Variety or Cultivar

'William Smith' _ 'William Smith' is a mid-sized, upright, herbaceous perennial with rounded leaves at its base. In summer, it bears upright, leafy stems which are clothed with dark-pink, saucer-shaped flowers, paler at the centre.


Sidalcea 'William Smith' is: Deciduous

Habit

Clump-forming, Erect

Awards

RHS AGM (Award of Garden Merit)

Flower

Dark-pink in Summer

Foliage

Dark-green in Summer

How to care

Watch out for

Specific pests

Slugs Slugs

Rust Rust

General care

Propagation methods

Division


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Where to grow

Sidalcea 'William Smith' (Prairie mallow 'William Smith') will reach a height of 0.9m and a spread of 0.5m after 2-5 years.

Suggested uses

Beds and borders, Cottage/Informal, Flower Arranging

Cultivation

Plant in well-drained, moderately fertile, humus-rich soil in full sun. Avoid heavy soils or those prone to waterlogging. Protect with a dry winter mulch during cold winters.

Soil type

Loamy, Sandy

Soil drainage

Moist but well-drained, Well-drained

Soil pH

Acid, Neutral

Light

Full Sun

Aspect

South

Exposure

Exposed, 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

Sidalcea 'William Smith'

Other names

Prairie mallow 'William Smith'

Genus

Sidalcea Sidalcea

Variety or Cultivar

'William Smith' _ 'William Smith' is a mid-sized, upright, herbaceous perennial with rounded leaves at its base. In summer, it bears upright, leafy stems which are clothed with dark-pink, saucer-shaped flowers, paler at the centre.

Foliage

Deciduous

Habit

Clump-forming, Erect

Awards

RHS AGM (Award of Garden Merit)


Colour

Flower

Dark-pink in Summer

Foliage

Dark-green in Summer


How to care

Watch out for

Specific pests

Slugs

Specific diseases

Rust

General care

Propagation methods

Division


Monthly care advice


Where to grow

Sidalcea 'William Smith' (Prairie mallow 'William Smith') will reach a height of 0.9m and a spread of 0.5m after 2-5 years.

Suggested uses

Beds and borders, Cottage/Informal, Flower Arranging

Cultivation

Plant in well-drained, moderately fertile, humus-rich soil in full sun. Avoid heavy soils or those prone to waterlogging. Protect with a dry winter mulch during cold winters.

Soil type

Loamy, Sandy

Soil drainage

Moist but well-drained, Well-drained

Soil pH

Acid, Neutral

Light

Full Sun

Aspect

South

Exposure

Exposed, 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

Defra's Risk register #1

Plant name

Sidalcea 'William Smith' (Prairie mallow 'William Smith')

Common pest name

Lance nematode; Nematode; Lance

Scientific pest name

Hoplolaimus spp.

Type

Nematode

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

Nematode species potentially affecting a wide variety of crops; prohibition of soil likely to mitigate risk substantially; keep under review in light of interceptions or findings should they occur in the EU.

Defra's Risk register #2

Plant name

Sidalcea 'William Smith' (Prairie mallow 'William Smith')

Common pest name

cotton mealybug

Scientific pest name

Phenacoccus solenopsis

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

Watching brief for potential impact on tomato production in the Mediterranean. Other southern European countries likely to be more at risk. Precautionary action will be taken on findings on planting material to protect glasshouse crops and botanical gardens.

Defra's Risk register #3

Plant name

Sidalcea 'William Smith' (Prairie mallow 'William Smith')

Common pest name

Scientific pest name

Spilostethus hospes

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)

3

General biosecurity comments

Seed bug unlikely to pose a significant threat to UK plant health.

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, Well-drained Tell us...
Soil pH: Acid, Neutral Tell us...
Light: Full Sun Tell us...
Aspect: South Tell us...
Exposure: Exposed, Sheltered Tell us...
Hardiness: Hardy (H4) Tell us...

GARDENS WITH THIS PLANT

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Liz Holder

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