Japanese Knotweed facts:

• Arrived in UK (South Wales) late 19th century.
• 2 – 3m height but spreads 7m horizontally.
• Perennial Rhizome.
• Edible (the early shoots!).
• Female only in UK but can Hybridise with Himalayan Knotweed.
• Can be spread via small cut pieces.
• Estimated to cost £1.56 billion to eradicate in UK (2007).
• Significant issue for developers (eg Olympic grounds).
• Can be sprayed with round up but can prove resistant.
• Can hybridise with Himalayan Knotweed which has male flowers.

For more information on Japanese Knotweed, especially with regards homes and developments, please see here.