Canadian pondweed growth resumes

Window

Typical: 20 Feb – 31 Mar (2026)

Water temp trigger

~7.0°C

Latitude range

50-52°N

Signals biological spring. Visible from the bank in clear water as the weed turns green and rises off the bottom.

Relevance to fishing

Signals biological spring underwater. Bloodworm and shrimp populations build in the resurgent weed and fish home in to feed.

Phenology chain

Triggered by

• Daffodil flowering typically 14d before (range 7 – 21d)

Triggers

• Chironomid (bloodworm) main emergence typically 21d after (range 14 – 30d)