Hibiscus moscheutos 'Old Yella' (Swamp mallow 'Old Yella')

Botanical name

Hibiscus moscheutos 'Old Yella'

Other names

Swamp mallow 'Old Yella', Swamp rose mallow 'Old Yella'

Genus

Hibiscus Hibiscus

Variety or Cultivar

'Old Yella' _ 'Old Yella' is a vigorous, compact, rounded, woody-based, deciduous perennial or subshrub with upright, branching stems bearing ovate, slightly toothed, mid-green leaves and, from midsummer to early autumn, large, wide, funnel-shaped, slightly ruffled, pale yellow flowers with a dark red central eye.

Foliage

Deciduous

Habit

Branching, Compact, Rounded, Upright

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Colour

Flower

Pale-yellow in Summer; Pale-yellow in Autumn

Foliage

Mid-green in Spring; Mid-green in Summer; Mid-green in Autumn

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How to care

Watch out for

Specific pests

Aphids , Mealybugs , Scale insects , Thrips

Specific diseases

Powdery mildew

General care

Pruning

Deadhead regularly. Pruning group 1. Can also be cut back low in late autumn or early spring before new growth appears.

Propagation methods

Semi-hardwood cuttings

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Monthly care advice

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Where to grow

Hibiscus moscheutos 'Old Yella' (Swamp mallow 'Old Yella') will reach a height of 1.2m and a spread of 1m after 5-10 years.

Suggested uses

City, Coastal, Cottage/Informal, Beds and borders, Hedging/Screens, Containers, Wallside and trellises

Cultivation

Plant in moist, free-draining, alkaline to neutral soil in a sheltered, sunny position. Feed regularly during the growing season. Drought tolerant once established. Slow to emerge in spring. Apply a thick, winter mulch in colder areas.

Soil type

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

Soil drainage

Moist but well-drained, Well-drained

Soil pH

Alkaline, Neutral

Light

Full Sun

Aspect

South, 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

Hibiscus moscheutos 'Old Yella' (Swamp mallow 'Old Yella')

Common pest name

Cassava whitefly; Cotton whitefly; Sweet potato whitefly; Tobacco whitefly

Scientific pest name

Bemisia tabaci non-European populations

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

Non-European populations of Bemisia tabaci pose an additional risk to European populations due to the potential for introducing non-European viruses.

Defra's Risk register #2

Plant name

Hibiscus moscheutos 'Old Yella' (Swamp mallow 'Old Yella')

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 #3

Plant name

Hibiscus moscheutos 'Old Yella' (Swamp mallow 'Old Yella')

Common pest name

Cassava whitefly; Cotton whitefly; Sweet potato whitefly; Tobacco whitefly

Scientific pest name

Bemisia tabaci European populations

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

The UK has a protected zone in place for this pest which helps to mitigate the risk of entry and establishment. An EFSA opinion is currently being discussed at the EU Annexes Working Group which recommends further strengthening of the regulation.

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/