Round Leaf Mint Bush, Australian Mint Bush

Prostanthera rotundifolia

Family: Lamiaceae (lay-mee-AY-see-ee) (Info)
Genus: Prostanthera (pros-TAN-ther-uh) (Info)
Species: rotundifolia (ro-tun-dih-FOH-lee-uh) (Info)




Foliage Color:

Unknown - Tell us

Bloom Characteristics:

This plant is attractive to bees, butterflies and/or birds

Water Requirements:

Average Water Needs; Water regularly; do not overwater

Where to Grow:

Unknown - Tell us


6-8 ft. (1.8-2.4 m)

8-10 ft. (2.4-3 m)

10-12 ft. (3-3.6 m)


36-48 in. (90-120 cm)

4-6 ft. (1.2-1.8 m)

6-8 ft. (1.8-2.4 m)

8-10 ft. (2.4-3 m)


USDA Zone 9a: to -6.6 C (20 F)

USDA Zone 9b: to -3.8 C (25 F)

USDA Zone 10a: to -1.1 C (30 F)

USDA Zone 10b: to 1.7 C (35 F)

Sun Exposure:

Sun to Partial Shade

Light Shade


Unknown - Tell us

Bloom Color:



Bloom Time:

Mid Spring

Late Spring/Early Summer




Other details:

Unknown - Tell us

Soil pH requirements:

Unknown - Tell us

Patent Information:

Unknown - Tell us

Propagation Methods:

Unknown - Tell us

Seed Collecting:

Unknown - Tell us


This plant has been said to grow in the following regions:

Arcadia, California

Eureka, California

Napa, California

Playa Del Rey, California

Santa Rosa, California

Westminster, California

Coos Bay, Oregon

Portland, Oregon

North Augusta, South Carolina

Ridgefield, Washington

Seattle, Washington (3 reports)

Sumner, Washington

show all

Gardeners' Notes:


On Apr 20, 2017, stephenp from Wirral, UK, Zone 9a,
United Kingdom (Zone 9a) wrote:

This grows in a botanic gardens in western UK and has done for the past 8 years.. seems to be quite tough and flowers every year without fail at this time of year. Beautiful plant


On May 6, 2014, JayInOz from rural New South Wales,
Australia wrote:

Mint bushes are native to my area and will grow in full sun, although they seem to do better with a little protection from hot winds- it can reach 115 degrees F or better on my farm. They don't usually live more than a few years, but are relatively easy to strike from cuttings in the warmer weather. We've just had our first decent frost here so I won't be taking cuttings for a while yet. Our biggest mint bush is near the front gate and my wife and I have developed the habit of running our hands through the foliage and smelling them every time we pass- we are becoming quite loopy with old age- lucky we don't have neighbours:) JayInOz


On Apr 14, 2014, carolnorthbay from Napa, CA wrote:

Have read Australian Mint Bush is short-lived so should be grateful we've had one for ten years. It has a lovely shape mainly from my pruning off the deadwood low on main branches. Now it is only sparsely leaved, and the gorgeous bloom doesn't cover the plant in April but appears only in patches near bottom edge. Very droopy in summer sun; watering does help. We may lose it this year; it's been on "last legs" for several.


On Sep 8, 2013, mirrormirror from PLAYA DEL REY, CA wrote:

Planted close to the ocean in S.California 2 yrs ago its grown into a perfect shrub about 4ft tall and 3ft wide. Light and lacey, interesting culinary/herby perfume. Now I want to move it and I'm advised to wait till cool weather cut it back to about 12-15" and water generously after replanting. Has anyone any experience?


On Aug 18, 2011, Milanart from Westminster, CA wrote:

I have been very pleased with this plant for about 4 years. It is in a semi-shaded spot, with good drainage, and right by the sprinkler head. However, it has become very twiggy in its interior, and I am in the process of thinning out the numerous dead twigs that are making it look scraggly. I had gently pruned it to keep a manageable shape (gardeners did a rather bad job). It looks like it wants to produce new growth from the junctions of the old twigs, so I am hopeful that I can get it back to a more bushy state. It is about 5 ft tall, and four feet wide, but you can see right through it now. It does bloom in the spring, and has a very unique and refreshing scent.


On Dec 13, 2008, shokami2 from Coos Bay, OR (Zone 8a) wrote:

the mint bush is a really tough hardy plant here. we can get down into the 30's and occassionally the 20's and its a trooper. high winds, hail, heat, nothing seems to bother it. loves to be trimmed, infact it you do so it will keep it full instead of the open look you can get with this. i will walk across my garden just to pull on the leaves to get the wonderful scent! very refreshing. mine is in full sun and gets the north and westerly winds and rain and hail. nothing seems to faze it.


On Jul 4, 2006, tiffanya from Sumner, WA (Zone 8a) wrote:

I really love this plant. I originally picked up two and was trying an experiment -- one was in part-full sun, the other in shade. The one in shade remained at about 1-foot high for two years, but after premature spring warming followed by a sudden frost early this year it died. The one in part-full sun (morning shade, afternoon-early eve full sun) is doing wonderfully. It has grown to nearly 5-feet high and has been trimmed into a boxy shape. This year was its first flowering; it has been in its current South-West exposure for 2 years now. When you brush up against it, it releases a pleasant, yet strong, scent. Very nice plant.


On Sep 29, 2004, tcfromky from Mercer, PA (Zone 5a) wrote:

Beautiful small to medium-sized aromatic shrub with tiny ovate or rounded leaves. Completely smothered with pretty lavender blossoms in spring.


On May 22, 2004, angelam from melbourne,
Australia wrote:

This is a nice compact shrub, with dense evergreen foliage that is lovely in flower and which smells good all year round. While it reputedly doesn't like poorly drained soils it is growing well in our heavy clay soil in full sun.