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Perennials, Tropicals > Plectranthus > Plectranthus amboinicus > Plectranthus amboinicus

Plectranthus amboinicus

Country Borage

Origin:  Africa - Burundi, Angola, Tanzania, Mozambique, Natal, Swaziland. Arabian Peninsula - Yemen, to India
Perennials, Tropicals
Coleus amboinicus, Coleus aromaticus, Coleus carnosus, Coleus crassifolius, Coleus subfrutectosus, Coleus suborbicularis, Coleus suganda, Coleus vaalae, Majana amboinica
USDA Hardiness Zone
Canadian Hardiness Zone
Requires cold season protection under glass.
RHS Hardiness Zone
Temperature (°C)
5 – 10
50 - 100 cm
Description and Growing Information
Flowering Period
General Description
An evergreen perennial plant with lemon-scented, thick, fleshy, sprawling stems and leaves.
Grow in in full sun or shade in a fertile well-drained soil.
Roadsides, waste places and on river banks; at elevations up to 1,500 metres.
Bark/Stem Description
Lemon-scented, thick, fleshy, sprawling stems.
Leaf Description
Petiolate with blades fleshy, broadly ovate to sub-orbicular, rhombic, or reniform, 4-10 cm long, 3-9 cm wide, rounded to truncate and then often long-attenuate at base, obtuse to rounded at apex, coarsely crenate to dentate at margins or entire toward base, densely appressed-pubescent above and beneath; petiole 1-4.5 cm long.
Flower Description
Terminal, spicate, 10-20 cm long, densely pubescent, the verticils 10-20(or more)-flowered, subglobose, the bracts 3-4 mm long, hirsute and glandular; pedicels slender, hirsute, to 5 mm long; calyx campanulate, 1.5-4 mm long, hirsute and glandular, the upper lip erect, broadly ovate-oblong, the other teeth narrow, acute; corolla pale blue or mauve to pink, 8-12 mm long, the tube declinate, 3-4 mm long, expanding distally, pubescent without, the upper lip to 4.5 mm long, 3 mm wide, erect, puberulent, the lower lop to 5-6 mm long, 4 mm wide, concave; stamens with filaments mostly fused into a tube around the style.
Fruit Description
A small nut, smooth, pale brown, 0.7 mm long, 0.5 mm wide.
Notable Specimens
Queen Sirikit Botanic Garden, Mae Rim District, Chiang Mai Province, Thailand.
By seed: sow in well-drained soil, covering lightly with a thin layer of sand, and place in a warm but shaded spot. The seed germinates in about three weeks. Stem cuttings or division.