Municipalities

Scientific Name

Prostanthera rotundifolia

Family Name

LAMIACEAE (LABIATAE)

Common Name

Round-leaved Mint-bush

Status

Vulnerable

Height

2.0m (200cm)

Flowers

Lilac to purple in showy sprays.

Fruit

Nutlets

Form

Much-branched aromatic shrub

Municipalities

Break O'Day; Georgetown; Launceston; Northern Midlands; West Tamar

Communities

Riparian

Habitat Notes

Locally frequent in north and east, along river banks and on adjacent rocky hillsides.

Site Tolerance

Dry; Moist; Rocky; Shady

Frost Tolerance

Moderate

Soil Tolerance

Clay; Fertile; Loam; Well-drained

General Notes

Prostantheras require full sun and excellent drainage. Even in ideal conditions they are not long-lived. To overcome the problem, the Australian National Botanic Gardens began, in the 1970s, to graft Prostanthera on to Westringia fruticosa rootstock. If grafting is not done, Prostanthera generally needs to be repropagated regularly. Suitable below powerlines.

Propagation Details

Propagation Calendar

Flowering Months

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Seed Collecting Months

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Sowing Months

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Cutting Months

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Seed Information

Seed Collection

Capsules split into four segments each with own slightly flattened, brown or grey seed, up to 2mm long. seeds can be collected close to maturity and dried in a warm spot until released

Seed Treatment Method

Standard

Seed Storage Life

Viable Seeds Per Gram

Seed Treatment Notes

Use fresh seed, germination may still be difficult. May germinate over a long period.

Germination Time

Suitable for Direct Seeding

Cuttings

Expected Time to Take Root

4-6 weeks*

Expected Time to Plant Out

3-6 months

Propagation by Division N.B. Transplant only from nearby to avoid disease.

Cutting Notes

* on heat and mist.Easily grown from cuttings.May be slow to strike. Young but firm tips and stems strike readily on heat and mist.