Intermediate
skill rating
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Sisyrinchium micranthum (Blue pigroot)
2 hours care
per year
per year
0.2m
Max height
Max height
0.3m
Max spread
Max spread
2-5 years
To maturity
To maturity
Plant details
Botanical name
Sisyrinchium micranthum
Other names
Blue pigroot, Striped rush-leaf, Sisyrinchium iridifolium, Scourweed
Genus
Sisyrinchium Sisyrinchium
Species
S. micranthum - S. micranthum is a compact, clump-forming, semi-evergreen perennial with flat, linear, grey-green leaves and small, white to pale yellow flowers with deep purple to maroon eyes.
Sisyrinchium micranthum is: Semi evergreen
Habit
Clump-forming, Compact
Flower
Pale-yellow, White in Summer
Foliage
Grey-green in All seasons
How to care
Watch out for
Diseases
May be subject to a root rot.
Root rot Root rot
General care
Pruning
Remove any discoloured foliage and faded flowers.
Propagation methods
Division, Seed
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Where to grow
Sisyrinchium micranthum (Blue pigroot) will reach a height of 0.2m and a spread of 0.3m after 2-5 years.
Suggested uses
Architectural, Beds and borders, City, Gravel, Rock
Cultivation
Plant in poor to moderately fertile, well-drained, neutral to slightly alkaline soil in full sun. Dislikes excessive winter wet. To ensure continued flowering, lift and divide every year or so. Self-seeds readily. Will happily tolerate wet planting condit
Soil type
Chalky, Loamy, Sandy
Soil drainage
Moist but well-drained, Moisture-retentive, Well-drained
Soil pH
Alkaline, 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
Sisyrinchium micranthum
Other names
Blue pigroot, Striped rush-leaf, Sisyrinchium iridifolium, Scourweed
Genus
Sisyrinchium Sisyrinchium
Species
S. micranthum - S. micranthum is a compact, clump-forming, semi-evergreen perennial with flat, linear, grey-green leaves and small, white to pale yellow flowers with deep purple to maroon eyes.
Foliage
Semi evergreen
Habit
Clump-forming, Compact
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Colour
Flower
Pale-yellow, White in Summer
Foliage
Grey-green in All seasons
How to care
Watch out for
Diseases
May be subject to a root rot.
Specific diseases
General care
Pruning
Remove any discoloured foliage and faded flowers.
Propagation methods
Division, Seed
Monthly care advice
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Where to grow
Sisyrinchium micranthum (Blue pigroot) will reach a height of 0.2m and a spread of 0.3m after 2-5 years.
Suggested uses
Architectural, Beds and borders, City, Gravel, Rock
Cultivation
Plant in poor to moderately fertile, well-drained, neutral to slightly alkaline soil in full sun. Dislikes excessive winter wet. To ensure continued flowering, lift and divide every year or so. Self-seeds readily. Will happily tolerate wet planting condit
Soil type
Chalky, Loamy, Sandy
Soil drainage
Moist but well-drained, Moisture-retentive, Well-drained
Soil pH
Alkaline, 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
Sisyrinchium micranthum (Blue pigroot)
Common pest name
common blossom thrips; cotton bud thrips; tomato thrips
Scientific pest name
Frankliniella schultzei
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)
3
General biosecurity comments
Polyphagous glasshouse pest; present in many countries; single finding in UK.
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/
In order to add a note on this plant, please add this plant to your plant lists.
| This plant likes... | Garden match | |
| Soil types: | Chalky, Loamy, Sandy | Tell us... |
| Soil drainage: | Moist but well-drained, Moisture-retentive, Well-drained | Tell us... |
| Soil pH: | Alkaline, Neutral | Tell us... |
| Light: | Full Sun | Tell us... |
| Aspect: | South | Tell us... |
| Exposure: | Exposed, Sheltered | Tell us... |
| Hardiness: | Hardy (H4) | Tell us... |
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