Troubleshooting
Giant Arrowhead problems — and how to fix them
Giant Arrowhead (Sagittaria montevidensis) is generally low-drama, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Wind rock and container tipping
The large leaf canopy acts as a sail in wind; use a heavy container (minimum 10 litres) filled with dense clay loam, and place in a sheltered pond position or weigh the container base with additional stones.
Invasive spread by seed
Sets large quantities of seed that can germinate prolifically in warm climates; deadhead spent flower stalks before seed dispersal to prevent unwanted spread, especially near natural waterways.
Prevent giant arrowhead problems before they start
Most giant arrowhead issues are care-mismatch, not bad luck. Dial in the basics:
Giant Arrowhead problems — FAQ
Why is my giant arrowhead wind rock and container tipping?
The large leaf canopy acts as a sail in wind; use a heavy container (minimum 10 litres) filled with dense clay loam, and place in a sheltered pond position or weigh the container base with additional stones.
Why is my giant arrowhead invasive spread by seed?
Sets large quantities of seed that can germinate prolifically in warm climates; deadhead spent flower stalks before seed dispersal to prevent unwanted spread, especially near natural waterways.