Crocosmia x Crocosmiiflora (Crocosmia pottsi x aurea) is an extremely popular garden plant, widely grown for its sprays of reddish-orange flowers that appear in late summer. It’s most usually found on roadside verges and hedgebanks, along cliff tops and woodland edges and on waste ground where garden plants are discarded.
It’s a horticultural hybrid, developed in France for ornamental purposes in the 1880s. It has since escaped into the wild and spread rapidly across Europe during the latter part of the 20th century
WARNINGThe hybrid, Crocosmia x Crocosmiiflora, is listed under Schedule 9 to the Wildlife and Countryside Act 1981 with respect to England and Wales. As such, it is an offence to plant or otherwise allow this species to grow in the wild.
It is recommended that this plant is controlled or eradicated, and you have a duty of care to prevent its spread from your property. You must handle and dispose of the plant in accordance with strict guidelines and legislation. Contact us, we can help.
Montbretia Control, Survey & Treatment Specialist
Japanese Knotweed Ltd are experienced contractors in the surveying and remediation of invasive non-native plant species. We will survey a site and establish the best method and price for control or eradication in accordance with the client’s requirements and any change of site use plans. Works are expertly undertaken by trained and certified operational staff, with all works fully recorded. By contacting us you benefit from:
- FREE* Survey
- Correct identification of Crocosmia x Crocosmiiflora
- A detailed investigation by an experienced surveyor
- A professional Management Plan document to include; survey findings, remedial recommendations and costs
- Nationwide service – quick response
- Expert advice and knowledge
- Member of the PCA Invasive Weed Control Group
If you suspect you have an invasive non-native species but are unsure, please send photos of the plant to email@example.com for free identification.
About - Montbretia
The Montbretia plant is easily recognised when in flower by the distinct shape and colour of its red flower heads. Growth begins in early spring with leaves sprouting in March. The leaves are grass-like, flat and sword-shaped, 30-80cm long, 1-2cm wide.
Flowering occurs between June and September. The trumpet-shaped flowers are orange-red in colour with yellow centres. They form two rows on either side of each stem. Key features include:
- Orange & tubular flowers in nodding clusters
- Long stamens
- Grows up to 60cm tall
- Found on road verges and hedges
- Flat spear-shaped leaves less than 3cm wide
- Flowers June to September
Dangers - Montbretia
Although the viable seed is produced, most reproduction is vegetative from underground corms and long creeping rhizomes; small fragments of root readily become established in the wild. Spread can then be rapid, resulting in dense stands at the exclusion of all other vegetation. It’s increasing rapidly and is especially frequent in the west and around coasts; in western Ireland whole roadsides can be densely carpeted for miles on end.
Montbretia tolerates frost, heat, moderate shade and grazing so can colonise a variety of habitats. It consumes fertiliser and water intended for crops. Small fragments of rhizomes can easily separate from the parent plant and become established in the wild. Also, corms can break off from the parent plant and begin to produce their own root network.
Montbretia is easily distinguished from other species when it is in flower between July and September. Identification outside of this period is more difficult. A key feature is the dense stands that it forms, which can spread to cover large areas. In addition, its smooth, upright, green leaves are relatively characteristic (although these can be confused with iris species). Green leaves are usually present from spring to autumn; dead brown leaves, dead flowering stems and seed heads are present throughout winter.
It grows in a range of conditions: wet or dry, poor or rich soil, sun or shade. Found by hedgerows, road verges, riversides, woods and wastelands, especially in slightly damp conditions. Spread can be rapid, resulting in dense clumps which out-compete native plants.
NB: If no Montbretia is found on the property or within 7m of the property (including neighbouring properties) a charge of £140 plus VAT will apply.
*If the area to be surveyed is greater than 1 acre we reserve the right to apply a charge to carry out the survey. For the Isle of Man or Isle of Wight charges may apply, price on request.