Kalanchoe rotundifolia aka Common Kalanchoe

Kalanchoe rotundifolia is generally easy to grow and is well suited to low-maintenance, drought-tolerant gardens. It needs little more than a sunny spot, sandy free-draining soil, and infrequent watering, and propagates so readily from cuttings, seed, and even fallen leaves that it self-perpetuates once established.

Plants typically reach up to about 1 metre (3 ft) tall under favourable conditions, with fleshy rounded leaves roughly 2.5 cm broad. As with most species in the genus, mature size stays under 1 m even though some Kalanchoe species can grow much larger.

The species is hardy only to light frost — SANBI lists it for zones 1-5 in their southern-African scheme, while NCSU recommends USDA zones 9-12 for outdoor cultivation. Indoors, a range of about 60-85°F (16-29°C) is ideal, and container plants should be moved inside before temperatures drop below 50°F (10°C).

In its native southern-African range the plant flowers from autumn into early winter (February-June), so growth and watering are most active in the warmer months. In cooler-climate cultivation, scale watering back in winter when growth slows, and protect plants from frost by bringing containers indoors before temperatures fall below 10°C.

Kalanchoe rotundifolia produces clusters of small tubular flowers held in flat-topped inflorescences on long erect stalks. Flowers open yellow to orange and turn red and noticeably twisted as they age, extending the floral display from autumn into early winter (February-June in the Southern Hemisphere).

There are no widely recognised cultivars in horticulture. Plants in the wild vary in foliage shape — despite the species name meaning "rounded leaves," some specimens show distinctly lobed leaves rather than the typical rounded form.

Outdoors, K. rotundifolia thrives in dry, sunny gardens with sandy, neutral, free-draining soil and minimal supplemental water. It is only suitable in frost-free or light-frost climates (roughly USDA zones 9-12); elsewhere, grow in containers that can come indoors for winter.

Plants are easy to lift and divide, and stems and leaves root readily, so repotting into a fresh free-draining loam-or-sand mix is straightforward whenever the plant outgrows its container. Allow the soil to dry briefly after repotting and resume normal watering once new growth appears.

Propagation is unusually simple: sow seed in early spring, take semi-hardwood or soft-tip cuttings and root them in river sand without rooting hormone, or allow fallen leaves to root themselves on the soil surface. Division and offsets also work well, and established plants self-seed freely.

Yellowing leaves on a kalanchoe most often indicate overwatering or poor drainage; the species needs to dry between waterings and is prone to root rot in soggy soil. Check that the pot drains freely and reduce watering frequency.

Drooping is most commonly caused by root rot from overwatering or by chill damage at temperatures near or below 10°C. Confirm the soil is dry to the touch before watering, ensure free drainage, and protect plants from cold.

The most common pest issues are mealybugs, aphids and brown soft scale; the most common diseases are root rot from overwatering and powdery mildew. Inspect leaf axils and the undersides of leaves regularly and treat infestations early.

Like most Kalanchoe, the species is pollinated by insects, including bees and other nectar-feeders attracted to its tubular yellow-orange flowers held above the foliage.

SANBI does not record any specific medicinal applications for K. rotundifolia; the only documented traditional use is as a Zulu charm. The wider Kalanchoe genus is used in folk medicine for infections, rheumatism, and inflammation, and contains pharmacologically active bufadienolides, but those data are not specific to this species.

The most distinctive recorded use is cultural rather than practical: the Zulu people traditionally employed K. rotundifolia as a charm intended to make the user invisible. Beyond that, the plant's main contemporary use is ornamental.

No edible uses are recorded for Kalanchoe rotundifolia. All parts of Kalanchoe species — leaves, stems, flowers, sap, roots and seeds — contain bufadienolide cardiac glycosides and are considered poisonous to humans and pets.

Common Kalanchoe’s native range is Madagascar and Tropical Africa.

Common Kalanchoe does best in dry soil and should only be watered sparingly.

To keep your Common Kalanchoe healthy, it's important to use a potting soil that won't retain too much moisture. A soil that drains well and contains perlite or vermiculite for drainage and some organic matter for nutrition is ideal. Adding a few handfuls of perlite to regular cactus soil from the store is an easy way to create this type of soil mix.

Common Kalanchoe requires abundant, bright, and direct light to thrive. The best placement for this plant is within one foot of a window to ensure it receives enough light. If you live in an area with more extreme weather, such as hot summers or cold winters, you may need to adjust the placement of the plant accordingly. During hot summer months, it is important to place the plant away from full sun, as this can cause the leaves to yellow or burn. During cold winter months, it is best to move the plant closer to the window to take advantage of the extra light that can help it survive. By keeping an eye on the current weather in your area, you can make sure your Common Kalanchoe is always in the right place to thrive.

Common Kalanchoe prefers dry environments, so misting the plant to provide extra humidity and allow water to linger on the leaves can create an ideal environment for fungi that can be harmful.

Repotting the Common Kalanchoe should be done either when it has doubled in size or on a yearly basis, whichever occurs sooner. Fresh potting soil with all the required nutrients, refreshed annually, will provide the plant with all the necessary sustenance, making the use of fertilizer unnecessary. Keep in mind that plants receive their energy from the sun, not fertilizer.

There is no verified data on the toxicity of this plant in the records of Ploi. If any person, including yourself, a family member, or a pet, consume plant material with an uncertain toxicity level, it is advisable to seek the advice of a healthcare expert.