The Story
Plant Bio
Prostanthera rotundifolia, commonly known as round leaved mint bush, is an evergreen shrub known for its aromatic leaves and vibrant purple flowers.
This species is particularly valued for its ability to thrive in coastal areas and its resilience to drought conditions.
Uses & Benefits:
Essentials
At a Glance
Plant Type
Shrub
Height
72 inches
Width
60 inches
Light
Full Sun, Partial Sun
Zones
8, 9, 10
Water
Low to moderate
Humidity
Low to moderate
Lifespan
Perennial
Native To
Australia
Toxicity
Non-toxic to humans and pets
Bloom period
Late spring – Early summer
In flower about 2 months of the year
Planting
How to Grow
- Tuck seeds into well-draining soil in early spring.
- Mist cuttings regularly to maintain humidity and encourage rooting.
- Transplant seedlings when they are sturdy and have developed several leaves.
- Prune lightly after flowering to promote bushy growth.
- Mulch around the base to retain moisture and suppress weeds.
- Fertilize with a balanced, slow-release fertilizer during the growing season.
Pro Tip
Use well-draining sandy soil and ensure plenty of sunlight for best growth.
Keep It Thriving
Care Guide
Do
- Water moderately, keeping soil slightly dry between watering 🌱
- Prune after flowering to maintain shape
- Apply balanced fertilizer during active growth
Don't
- Avoid overwatering to prevent root rot ❌
- Do not fertilize in winter
- Never neglect pruning for shape and health
Seasonal Care Calendar
| Task | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Fertilize | ||||||||||||
| Prune | ||||||||||||
| Winter Prep |
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
Round-leaved Mint Bush questions
What zones can Round-leaved Mint Bush grow in?
Round-leaved Mint Bush 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 Round-leaved Mint Bush deer resistant?
Yes — Round-leaved Mint Bush is rated deer-resistant. Deer typically pass it over, though extreme hunger can override any plant's defenses.
When does Round-leaved Mint Bush bloom?
Round-leaved Mint Bush typically blooms in late spring through early summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.
Does Round-leaved Mint Bush need full sun?
Round-leaved Mint Bush does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.
Is Round-leaved Mint Bush drought tolerant?
Yes — once established (usually after the first full season), Round-leaved Mint Bush handles dry spells with minimal watering. Water deeply its first year to build the root system that makes that possible.
More Prostanthera to compare
Keep exploring
Explore the genus
Hardy in your zone?
Grow Round-leaved Mint Bush 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.