09/01/2026
🌿 Beauty can be deceiving.
Those delicate sprays of white flowers popping up along Catskills roadsides, streambanks, and other disturbed areas may look beautiful—but they could belong to invasive Japanese knotweed (Reynoutria japonica).
Japanese knotweed flowers in late summer, making this a great time to learn how to spot it.
Look for:
• Clusters of small, creamy-white flowers
• Broad, heart- or shovel-shaped leaves
• Hollow, bamboo-like stems
• Dense patches that can quickly take over an area
Originally introduced as an ornamental plant, Japanese knotweed can form dense stands that crowd out native vegetation and reduce habitat diversity. It’s also notoriously difficult to manage because even small pieces of its underground stems can potentially start new plants.
🌱 If you spot Japanese knotweed, don’t pull or cut it without a management plan—you could unintentionally help it spread.
Visit our website to learn more about Japanese knotweed and best management practices: https://www.catskillinvasives.com/knotweed
📍Take photos and report your observation to iMapInvasives to help track its distribution across New York.
Sometimes even the prettiest plants can cause big problems for our native ecosystems.