The Story
Plant Bio
Thespesia populnea, the Portia tree, is an evergreen tropical tree with a dense, rounded crown of heart-shaped, glossy dark green leaves. Large, bell-shaped flowers open pale yellow with a deep maroon center in the morning, then deepen to purplish-pink by evening.
This species is exceptionally tolerant of coastal conditions, thriving in salty winds, sandy soils, and brackish water tables. In Florida, it is classified as a Category I invasive species due to its ability to form dense thickets that displace native beach vegetation.
Uses & Benefits:
Essentials
At a Glance
Plant Type
Tree
Height
512"
Width
472"
Light
Full Sun
Zones
10
Water
Low
Humidity
High
Lifespan
Long
Native To
Old World tropics
Toxicity
Non-toxic
Bloom period
Spring – Fall
In flower about 9 months of the year
Planting
How to Grow
- Plant in a full-sun location with well-drained sand, loam, or clay soil.
- Water regularly until established, after which the tree exhibits high drought tolerance.
- Prune young trees sparingly only to remove dead wood or correct structural form.
- Clear fallen woody capsules and leaves periodically to maintain neatness under the canopy.
Pro Tip
Avoid heavy shearing into old, leafless wood, as regrowth from old wood is slow and patchy. To distinguish this species from the similar Hibiscus tiliaceus, look for a smooth secretory area on the leaf midrib and flattened, woody, indehiscent seed capsules.
Keep It Thriving
Care Guide
Do
- Grow in full sun to ensure dense foliage and consistent flowering.
- Use in coastal landscapes where salt spray and brackish water are present.
- Prune lightly when young to establish a strong central leader.
Don't
- Do not plant in areas prone to freezing temperatures, as frost will damage or kill the tree.
- Do not shear heavily into old, bare wood.
- Do not plant in central or southern Florida where it is an invasive threat; use sea grape instead.
Seasonal Care Calendar
| Task | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Fertilize | ||||||||||||
| Pest Check | ||||||||||||
| Propagate | ||||||||||||
| Prune | ||||||||||||
| Spring Cleanup |
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
Portia Tree questions
What zones can Portia Tree grow in?
Portia Tree is hardy in USDA Zone 10. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.
When does Portia Tree bloom?
Portia Tree typically blooms in spring through fall. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.
Does Portia Tree need full sun?
Portia Tree does best in full sun (6+ hours).
Is Portia Tree drought tolerant?
Yes — once established (usually after the first full season), Portia Tree handles dry spells with minimal watering. Water deeply its first year to build the root system that makes that possible.
Keep exploring
Explore the genus
Hardy in your zone?
Grow Portia Tree 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.