Kalanchoe

Kalanchoe forms and flowering stages

• Plant shape: flowering, trailing and sculptural succulent forms.
• Bloom stage: open flowers and unopened buds vary through transport.
• Pet safety: Kalanchoe ingestion can poison cats and dogs.

Kalanchoe: botanical profile for Old World succulent shrubs

Kalanchoe is a succulent genus in Crassulaceae, erected by Adanson in 1763 and now understood to contain around 120-130 species. Diversity is centred in Madagascar and mainland Africa, with additional species in Arabia and a single native American taxon. Many Kalanchoe lineages are important ornamentals, particularly compact flowering cultivars of Kalanchoe blossfeldiana and vegetatively propagating “mother-of-thousands” types in the Bryophyllum group.

• Order: Saxifragales
• Family: Crassulaceae
• Tribe: Kalanchoeae
• Genus: Kalanchoe Adans.
• Type species: Tied historically to early-described Madagascan species; modern summaries emphasise several archetypal taxa not a single widely cited type.
• Chromosomes: Chromosome numbers largely divisible by 17, 18 or 20; many species and cultivars show 2n = 34 or higher polyploid counts such as 2n ≈ 68 and above.

Range & habitat: Kalanchoe is predominantly Old World, with major centres in Madagascar, southern and eastern Africa and outliers in the Arabian Peninsula and South Asia. Species occupy rocky slopes, inselbergs, dry scrub, thicket margins and occasionally more mesic habitats, usually where soils are shallow, stony and rapidly drained but fog, dew or seasonal rains provide intermittent moisture.

• Life form: Succulent herbs, subshrubs and small shrubs, from compact, basal rosettes to branching woody plants up to several metres tall in robust species.
• Leaf attachment: Opposite or whorled leaves along stems or grouped in rosettes; Bryophyllum-type taxa develop plantlets on crenate leaf margins that detach and root readily.
• Leaf size: Leaf blades range from a few centimetres in small rock-dwellers to 20 cm or more in larger shrub forms; thickness and outline vary widely among sections.
• Texture & colour: Fleshy leaves with smooth, glabrous or velvety pubescent surfaces; colours include bright to grey-green, bluish and bronze, sometimes with contrasting margins or spotting.
• Notable adaptation: CAM photosynthesis and prolific vegetative reproduction (bulbils, offsets, stem fragments) allow Kalanchoe to persist and spread under high light, intermittent water and nutrient-poor substrates.

Inflorescence & fruit: Kalanchoe produces terminal cymes or panicles of tubular, four-merous flowers in strong colours from white and yellow through orange, red and magenta. Fruits are dry follicles containing numerous small seeds; in many ornamental clones, seed production is secondary to vegetative propagation or breeding programmes.

Kalanchoe foliage, branching and seasonal flowers

Kalanchoe includes compact flowering cultivars, felted foliage plants and upright branching succulents. Some remain as low mounds, while others develop woody-looking stems and a taller crown.

Flowering forms carry bud clusters above the leaves. Foliage species may have toothed margins, powdery surfaces or dense hairs. Strong light supports sturdy growth and characteristic colour, but plants raised under cover need a gradual move into direct sun. The fertiliser guide helps time feeding around active growth and flowering rather than applying it continuously.

Thick leaves store water, but drying tolerance still varies between species, pot sizes and seasons. Many Kalanchoe branch after pruning and root from stems or leaves; suitable methods are covered in the houseplant propagation guide. Many species are toxic to pets and can affect the digestive system and heart. Keep foliage and fallen flowers inaccessible to children and animals.