Lobivia famatimensis, also known as the Orange Cob Cactus, is a small, attractive cactus from the Cactaceae family. Native to the mountainous regions of Northwest Argentina, it thrives on grasslands and rocky soils at elevations up to 3,000 meters. This slow-growing plant often exhibits a solitary habit, though it can form small clusters. Its stem is typically globular to oval, reaching up to 4 cm in height and 3 cm in diameter, displaying dark green hues that may tinge purple in ample sun. The stem features 24-40 ribs arranged in small tubercles, from which brownish areoles bear 7-9 yellowish to brownish radial spines that curve downwards, with no central spines.
Cultivation and Care
Light
Lobivia famatimensis thrives in bright light and requires significant sun exposure for healthy growth and prolific flowering. Place the plant in a location with full sun, such as a south-facing window indoors or an outdoor spot with direct sunlight. Protect it from intense, direct afternoon sun during the hottest periods to prevent scorching. If the plant has been in lower light conditions, gradually introduce it to brighter sun to prevent shock.
Soil and Potting
Well-draining soil is crucial for Lobivia famatimensis to prevent root rot. A gritty and porous potting mix is suitable, incorporating elements like pumice, perlite, and coarse sand with minimal organic matter. Terracotta pots are recommended for their breathability, helping the soil dry quickly. Ensure the pot has drainage holes to prevent water accumulation. Repot every one to two years or when the plant outgrows its container, ideally in early spring with fresh potting soil.
Watering
Water Lobivia famatimensis using the “soak and dry” method. Thoroughly drench the soil until water drains, then allow it to dry completely before the next watering. During its active growing season in spring and summer, water more frequently, typically every 7 days depending on environmental conditions. Reduce watering during colder, dormant months to prevent rot. Signs of overwatering include a soft or mushy stem, while shriveling can indicate underwatering.
Temperature and Humidity
Lobivia famatimensis prefers warm conditions during active growth, with optimal temperatures around 22-24°C (71-75°F). It tolerates temperatures down to 5°C (41°F) but is not frost-hardy and should be brought indoors in colder periods. For successful flowering, a cool, dry dormancy period with temperatures ideally between 4-13°C (39-55°F) is beneficial. It thrives in low humidity environments, typically preferring 30-45% humidity.
Fertilizing
Fertilize Lobivia famatimensis regularly during the spring and summer growing season. A low-nitrogen, high-potassium cactus fertilizer is recommended. Apply every two weeks or monthly, diluted to half strength, to support healthy growth. Cease fertilization during fall and winter dormancy. Avoid over-fertilization, especially with high nitrogen, as it can lead to undesirable growth.
Propagation
Lobivia famatimensis can be propagated through two primary methods: offsets (pups) and seeds. Offsets are a straightforward propagation method. Small plantlets (offsets) can be carefully removed from the base in spring. After removal, allow the cut surface to callus for a few days before planting in a well-draining cactus mix of sand, soil, and pumice.
Seed propagation is also viable. Sow seeds in a sandy loam mix. Maintain high humidity and a consistent temperature of around 14°C (57°F) for successful germination. Leave seedlings undisturbed until they establish a robust root system, then pot individually.
Flowering and Dormancy
Lobivia famatimensis produces striking flowers, a highlight of its growth cycle. Blooming typically occurs in early summer, with funnel-shaped blossoms emerging near the stem’s apex. Flowers are often pearly-yellow, yellow-orange, or dull-red, with variations including pink or white. These beautiful blooms are short-lived, usually lasting only a day or two.
Dormancy is integral for Lobivia famatimensis’s life cycle, particularly for encouraging flowering. The plant enters this resting phase in winter. During this time, keep the plant dry and expose it to cooler temperatures. This cool, dry rest encourages future bloom production when the growing season resumes.