Troubleshooting
Small-flowered Pickerelweed problems — and how to fix them
Small-flowered Pickerelweed (Pontederia parviflora) is generally forgiving once you match its basics, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Aphid colonies on flower spikes
Dense flower spikes attract aphids in warm weather. Blast off with a strong jet of water or introduce lacewings; avoid chemical sprays near open water to protect aquatic life.
Overcrowding and rhizome spread
Rhizomes can spread aggressively in pond margins. Divide clumps every 2–3 years in spring, removing outer sections, to maintain vigour and prevent choking out neighbouring marginals.
Frost damage to crowns
In zones below 8, crowns can be damaged by hard frosts if water freezes solid. Submerge baskets below the ice line (>30 cm depth) or overwinter indoors in a frost-free location.
Prevent small-flowered pickerelweed problems before they start
Most small-flowered pickerelweed issues are care-mismatch, not bad luck. Dial in the basics:
Looking for small-flowered pickerelweed in general rather than its problems? Read the full small-flowered pickerelweed care guide — light, water, soil and feeding.
Small-flowered Pickerelweed problems — FAQ
Why is my small-flowered pickerelweed aphid colonies on flower spikes?
Dense flower spikes attract aphids in warm weather. Blast off with a strong jet of water or introduce lacewings; avoid chemical sprays near open water to protect aquatic life.
Why is my small-flowered pickerelweed overcrowding and rhizome spread?
Rhizomes can spread aggressively in pond margins. Divide clumps every 2–3 years in spring, removing outer sections, to maintain vigour and prevent choking out neighbouring marginals.
Why is my small-flowered pickerelweed frost damage to crowns?
In zones below 8, crowns can be damaged by hard frosts if water freezes solid. Submerge baskets below the ice line (>30 cm depth) or overwinter indoors in a frost-free location.