How to prune myriophyllum spicatum

Late spring through summer before seed set. Cut stems to the desired length with aquatic scissors or shears. Remove all cuttings from the water completely, as even small fragments can root and establish. Check local regulations before growing this species outdoors.

Every 2–4 weeks during growing season. Eurasian watermilfoil is highly invasive in many regions and must be actively managed. In permitted aquatic settings, cut stems back regularly to control spread and remove biomass. Never introduce cuttings to natural waterways. In ornamental use, trim dead or overly long stems to keep growth manageable and prevent oxygen depletion in the water.

Cut stems to the desired length with aquatic scissors or shears. Remove all cuttings from the water completely, as even small fragments can root and establish. Check local regulations before growing this species outdoors.