Thomas Edison Dahlia
Dahlia hortensia 'Thomas Edison'
Not currently listed at our partner nurseries.
Essentials
At a Glance
Plant Type
Bulb Corm Tuber
Height
42 inches
Width
24 inches
Light
Full Sun
Zones
8, 9
Water
Moderate
Humidity
Average
Lifespan
Tender perennial
Native To
Mexico
Toxicity
Mildly toxic to pets if ingested.
The Story
Plant Bio
Dahlia 'Thomas Edison' is noted for its large, vibrant purple flowers that create an impressive display in the garden. 'Thomas Edison' is a Dinnerplate dahlia of the Formal Decorative type, featuring very large, fully double, deep purple flowers up to 8 inches across.
Uses & Benefits:
Marketplace
Where to Buy
We couldn't find this plant listed online right now.
Shipping costs Year-round shipping Free shipping
Planting
How to Grow
- Choose a sunny location with well-draining soil.
- Tuck young plants into the ground after the last frost, spacing 18-24 inches apart.
- Water regularly to keep soil moist but not waterlogged, especially during dry spells.
- Fertilize monthly with a balanced, water-soluble fertilizer during the growing season.
- Pinch out the top growth to encourage bushier plants and remove dead or yellowing leaves.
- Lift tubers in fall after the first frost for overwintering in colder zones.
Pro Tip
Mulch around plants to retain moisture and suppress weeds, especially in hot climates.
Keep It Thriving
Care Guide
Do
- Water deeply once a week during dry periods 💧
- Pinch back to promote bushiness 🌿
- Fertilize monthly during active growth
- Support tall varieties with stakes
- Remove spent flowers to encourage more blooms
Don't
- Avoid overwatering to prevent root rot ❌
- Don’t fertilize late in the season to prevent legginess
- Refrain from disturbing tubers in mid-season
- Avoid planting in shaded areas where blooms may be sparse
Seasonal Care Calendar
| Task | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Deadhead | ||||||||||||
| Fertilize | ||||||||||||
| Harvest | ||||||||||||
| Lift Store | ||||||||||||
| Pinch | ||||||||||||
| Plant | ||||||||||||
| Stake |
Watch Out For
Pests & Diseases
Common Pests
Common Diseases
In the Garden
Landscape Uses & Companions
Landscape Uses
Companion Plants
Multiply
Propagation Methods
Good to Know
Common Questions
Thomas Edison Dahlia questions
What zones can Thomas Edison Dahlia grow in?
Thomas Edison Dahlia is hardy in USDA Zones 8–10. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.
Is Thomas Edison Dahlia deer resistant?
Not reliably. Deer may browse Thomas Edison Dahlia, especially tender spring growth — plan on repellents or fencing where pressure is high.
When does Thomas Edison Dahlia bloom?
Thomas Edison Dahlia typically blooms in mid-summer to fall through early fall. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.
Does Thomas Edison Dahlia need full sun?
Thomas Edison Dahlia does best in full sun (6+ hours).
More Dahlia to compare
Dahlia
Dahlia variabilis
Dinnerplate Dahlia
Dahlia x pinnata 'Dinnerplate Cutting Blend'
Dahlia
Dahlia variabilis 'Hart'
Lady Darlene Dahlia
Dahlia x pinnata 'Lady Darlene'
Babette Giant Ball Dahlia
Dahlia x pinnata 'Babette Giant Ball'
Mrs. Eileen Dahlia
Dahlia spetabilis 'Mrs Eileen'
Keep exploring
Explore the genus
Collections featuring this plant
Hardy in your zone?
Grow Thomas Edison Dahlia with confidence
See it in a design of your actual yard, get zone-matched care reminders, and track it season by season in your garden journal.
