Blossfeldia

Blossfeldia is a genus of cacti (family Cactaceae) containing only one species, Blossfeldia liliputana, native to South America in northwestern Argentina (Jujuy, Salta, Tucumán, Catamarca and Mendoza Provinces) and southern Bolivia (Santa Cruz and Potosí Departments). It grows at 1,200–3,500 m altitude in the Andes, typically growing in rock crevices, and often close to waterfalls.

Blossfeldia liliputana is truly one of the most remarkable plants on Earth — a cactus of extremes in almost every way.

It is the only species in the genus Blossfeldia, and the only member of subfamily Blossfeldioideae — making it one of the most isolated and distinctive lineages in the entire cactus family. It was named in honour of Harry Blossfeld, a German plant collector and photographer active in South America in the mid-20th century.

It holds the title of the smallest cactus in the world — and arguably the smallest succulent. Mature plants typically measure just 1–2 cm in diameter, rarely reaching 3 cm. The name liliputana is a direct reference to the tiny inhabitants of Lilliput from Jonathan Swift's Gulliver's Travels.

It is a flat to slightly domed, spineless cactus with a grey-green to greyish body. The surface is covered with tiny woolly areoles arranged in spirals. It produces minuscule white to pale pink flowers, only a few millimetres across — tiny even by the plant's own scale. It often grows in clusters of many individuals forming small cushions on rock faces.

It grows in the Andes of Bolivia and Argentina, at elevations of 1,500 to over 3,500 metres above sea level. It specialises in growing on steep, shaded rock faces and cliff crevices — often on near-vertical surfaces where almost nothing else can survive. It is frequently found on granite or gneiss rocks, tucked into cracks where a thin film of moisture collects.

Blossfeldia has several unique physiological traits that set it apart from virtually all other cacti:

• It can survive extreme desiccation — losing up to 80% of its water content and then fully rehydrating when moisture returns. This is called poikilohydry, and it is extremely rare among flowering plants and almost unheard of in cacti.
• It has no ribs and no spines — both highly unusual for a cactus.
• Its internal anatomy is also unusual — it lacks the typical water-storing tissue found in most cacti, which is part of why it can tolerate such extreme drying without dying.
• It is considered a living fossil in some respects — its isolated phylogenetic position and unusual traits suggest it diverged very early from other cacti.
• Phylogenomic studies (including the 2025 de Vos et al. classification) place Blossfeldia in its own subfamily Blossfeldioideae, reflecting how deeply different it is from other cacti genetically. It likely diverged from other cactus lineages tens of millions of years ago.
• It is not currently considered globally threatened, as it occurs across a fairly wide range in the Andes and its cliff-face habitat is generally inaccessible. However, some local populations are affected by collection and habitat disturbance. It is protected under CITES Appendix II.
• It is a favourite among collectors of miniature and rare cacti, but quite challenging to grow well:
• It is almost always grown grafted onto other cacti (such as Echinopsis or Trichocereus), as growing it on its own roots is notoriously difficult in cultivation
• On its own roots it needs very porous, mineral substrate, careful watering, and good air circulation
• It is slow-growing even by cactus standards
• It tolerates surprisingly cool temperatures given its high-altitude origin, and can handle light frost

Despite being the smallest cactus, it is remarkably tough — surviving conditions (desiccation, cold, near-zero nutrients) that would kill most plants many times its size. It is a perfect example of how extreme miniaturisation in plants often goes hand in hand with extraordinary physiological adaptation.

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Photo by: Michael Wolf