Plectranthus ernstii — an easy houseplant, prefers partial sun light
SPECIMEN · FROM THE LIBRARY
Plectranthus ernstii

Plectranthus Ernstii

Updated · 43 observations
ON THIS PLANT

The Plectranthus ernstii is a semi-succulent herbaceous perennial known as the Bonsai Mint. This herb can only reach up to 10 inches tall with a swollen base and branching, articulated gray stems that become brown with age. The Bonsai Mint is most popular for its aromatic semi-succulent leaves. Its leaves are somewhat ovate to triangular, covered in soft, fine hairs and pale, reddish-brown gland dots

A note from PlantMom

Bonsai mint has moderate disease resistance and is more sensitive to humidity and overwatering. It is also more prone to disease when it receives little light and is overwatered. Regarding care, Bonsai mint is drought-tolerant and can go long periods without watering. It needs little fertilizer and only occasional pruning. This makes it suitable for people of all levels of experience, especially those who want to spend less time caring for their plants and who may sometimes be away from home for extended periods. It is a good option for those who do not want to spend much time on plant care but still want a plant that is easy to maintain.

— PlantMom
CARE GUIDE

How to keep Plectranthus Ernstii.

Light

Bonsai mint comes from habitats with filtered light, like the understory of forests or rocky locations that provide natural shade. It favors partial sunlight but can also withstand full sun.

Water

Bonsai mint is well-suited for dry, semi-arid regions and is known for its drought tolerance. To mimic its natural habitat, it only requires weekly watering. Mainly cultivated indoors, bonsai mint thrives in containers where controlling moisture levels prevents over-saturation and promotes robust health through effective soil moisture management.

Temperature

Bonsai mint prospers in warm conditions and requires higher temperatures during the growing season to encourage growth and metabolic activity. It prefers plenty of sunlight, proper moisture levels, and good airflow. However, it can be damaged by very low temperatures and by overwatering. It's important to maintain a balance and to avoid both excessively high temperatures and overly dry conditions.

Fertilizer

For Bonsai mint, small amounts of fertilizer once or twice a year during the growing season are enough. Do not fertilize in winter or during summer dormancy. Cut back on feeding for plants that have been repotted and wait a couple of months after repotting before applying fertilizer. Fertilizing helps maintain healthy growth and promotes flowering.

Pruning

Bonsai mint is a small aromatic shrub that is ideal for bonsai cultivation. To maintain its shape and encourage a more compact form, prune the plant during winter. This involves removing any leggy branches and shaping the shrub. Regular pruning not only enhances the plant's appearance but also promotes healthy growth. Be sure to use clean, sharp tools to minimize stress on the plant.

Pot & Repot

When repotting Bonsai mint, choose a pot slightly larger than the current one that provides good drainage. Use a gritty, well-draining succulent or cactus potting mix. Gently remove the plant from its old pot, brush off excess soil, and set it in at the same depth. Wait a few days before watering so any root injuries can heal. Repot in spring or fall and place it in a brightly lit spot.

Toxicity

Although the Bonsai Mint has not been reported as toxic to either humans or animals, the oils from Plectranthus plants have been known to cause adverse effects. However, it would take ingesting a large amount to elicit symptoms of intoxication.

Further reading →

The toxicity and danger assessments provided are for reference only. We do not assure their accuracy, so it's crucial not to depend on them. Seek professional advice when necessary for accurate guidance.

CHARACTERISTICS

Botanical profile.

Plant Type
Tree, Shrub
Life Cycle
Perennial
Genus
Plectranthus
Family
Lamiaceae
Hardiness Zone
9-13
Mature Height
25 cm
Mature Spread
25 cm
Leaf Color
Green
Leaf Type
Evergreen
Flower Color
Lavender
Flower Size
1.02 cm to 1.52 cm
Bloom Time
Mid summer, Late summer, Early fall
Planting Time
Spring, Summer
Harvest Time
Fall
Native Area
South Africa
PLATES
Plectranthus ernstii leaf
PLATE 01 · leaf
Plectranthus ernstii leaf
PLATE 02 · leaf
Plectranthus ernstii flower
PLATE 03 · flower
Plectranthus ernstii flower
PLATE 04 · flower
Plectranthus ernstii bark
PLATE 05 · bark
Plectranthus ernstii bark
PLATE 06 · bark
ALSO IN THE LIBRARY

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