Tree dahlia (Dahlia excelsa)
Care, watering, light and tips for Tree dahlia on Floravia.
Quick facts
- Family: Asteraceae
- Difficulty: Moderate care
- Watering: every 3 days
- Light: Full sun
- Temperature: 0–35 °C
- Toxicity: Toxic to pets
About Tree dahlia
Dahlia excelsa, commonly known as Tree Dahlia, is an imposing tuberous perennial plant from the Asteraceae family, native to the mountainous regions of Mexico and Central America. It stands out for its rapid growth and robust, branched stems that can reach heights of up to 6 meters, giving it an almost tree-like appearance. Its large, single or semi-double flowers, ranging from lavender pink to purple, bloom in autumn, creating a stunning visual display at the back of mixed borders or as a focal point in spacious gardens.
Native range
Mexico and Central America
Care tips
Tree Dahlia thrives in full sun in well-drained soil rich in organic matter. It requires regular and abundant watering during its active growth and flowering period, reducing it once the plant enters dormancy or if grown in areas with wet winters. It is essential to protect the tubers from severe frosts, either by mulching the soil or digging them up in cold climates. A common mistake is not providing enough space, as their large size requires careful garden planning.
How to save a dying Tree dahlia
- Warning signs
- Yellowing or wilting leaves, soft or blackened stems, no blooms.
- First aid
- Check roots for rot, prune affected stems, improve drainage, review watering.
- What kills it
- Overwatering causing tuber rot, or lack of protection from severe frost.
- Can it be saved?
- Yes, if rot is not too advanced and watering/protection issues are corrected.