Blossfeldia liliputana Werderm.
Based on the International Code of Botanical Nomenclature rules and recommendations, the spelling of the species name "liliputana" is an orthographic error and needs to be corrected to "liliputiana." No official change has been made for now.
Blossfeldia atroviridis, Blossfeldia campaniflora, Blossfeldia cryptocarpa, Blossfeldia fechseri, Blossfeldia liliputiana, Blossfeldia minima, Blossfeldia pedicellata, Parodia liliputana
Blossfeldia liliputana, also known as Blossfeldia liliputiana, is dwarf cactus with grey-green disk-shaped stems with tufts of white wool and without ribs and spines. It grows solitary or in clumps, with stems typically only 0.5 inches (1.3 cm) in diameter. Flowers are white or pink, up to 0.6 inches (1.5 cm) long, up to 0.3 inches (0.7 cm) in diameter, and appear from late spring to early summer.
This species is the smallest known cactus in the world.
The specific epithet, "liliputana," refers to the imaginary country of tiny inhabitants in Swift's Gulliver's Travels.
USDA hardiness zone 8b to 10b: from 15 °F (−9.4 °C) to 40 °F (+4.4 °C).
How to Grow and Care
The Blossfeldia is much easier to grow when grafted. However, because of their slow growth rate, they are often grafted, which causes them to grow very fast and offset heavily but lose their characteristic disc-like shape, becoming quite globular and bloated. In this case, the minimum temperatures acceptable should take into account the requirements for the rootstock.
Water during the growing period. The thin, fibrous roots suffer if there is humidity. Therefore, the plant should be watered when the surrounding terrain is dry. But avoid wetting the bodies of these plants while they are in sunlight. A wet plant in the sunlight can cause sun burning, leading to scars or even fungal infections and death. Keep dry as soon as the temperature drops, and keep it perfectly dry in winter at 40 to 60 °F (5 to 15 °C). Preferable not to water on overcast days, humid days, or cold winter days.
See more at: How to Grow and Care for Blossfeldia.
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