Dahlia Planting & Care Guide can cause irritation or illness if chewed or swallowed. Keep it out of reach of pets and small children.
Irritant: Phototoxic polyacetylene compounds
Severity: mild
Symptoms: Foliage is toxic if eaten in large quantities. Skin irritation following repeated handling of the tubers and contact with leaves and sunlight (phototoxicity). Mild gastrointestinal signs.
The Full Picture
When the dahlia is a foot tall, pinch off the top growing center. It delays the first flower but results in a much bushier plant.