The ZZ Oscura plant (Zamioculcas zamiifolia ‘Oscura’ or ‘Dowon’), also known as ‘Raven ZZ’ or ‘Supernova’, is a popular indoor plant. It is favored by enthusiasts and beginners for its robust nature and distinct aesthetic.
Unique Characteristics of ZZ Oscura
The ZZ Oscura is known for its exceptionally dark foliage. New leaves emerge vibrant lime green, then deepen to a rich purple-black as they mature and are exposed to light, creating a striking contrast. Compared to other ZZ varieties, it has a more compact growth habit with shorter internodes, contributing to a fuller, architectural appearance. This combination of dark, glossy leaves and dense growth makes it a sought-after plant for indoor spaces.
ZZ Oscura Care Guide
Light
ZZ Oscura thrives in bright, indirect light, such as near a north, east, or west-facing window. While it tolerates lower light, insufficient light can diminish its signature dark coloration. Avoid direct, intense sunlight, which can scorch leaves.
Watering
The ZZ Oscura is drought-tolerant due to its thick, water-storing rhizomes. Overwatering is the most frequent cause of problems, often leading to root rot. Allow the soil to dry out completely between waterings, typically every two to three weeks, though this varies. To check soil moisture, insert a finger about an inch or two into the soil; if it feels dry, the plant is ready for water.
Soil
A well-draining potting mix is essential for ZZ Oscura to prevent waterlogging. Amend a standard potting mix with materials like perlite or pumice to enhance drainage. A common recommendation is a mix of 60% regular potting soil and 40% cactus or succulent mix for superior drainage.
Temperature and Humidity
ZZ Oscura prefers average room temperatures, ideally 65°F to 75°F (18°C-24°C). It is sensitive to cold drafts and sudden temperature drops, especially below 50°F (10°C). While it tolerates typical household humidity, avoid placement near air conditioning or heating vents to prevent leaf crisping from dry air.
Fertilizing
ZZ Oscura has modest nutrient requirements. Fertilize infrequently, typically once or twice during the active growing season in spring and summer. A balanced liquid fertilizer diluted to half strength is sufficient. Over-fertilization can be detrimental.
Propagating ZZ Oscura
Propagating ZZ Oscura is possible through stem or leaf cuttings, though it is a slow process. For stem cuttings, cut a stalk with a few leaves from the base, allow it to callus for a few hours, then place in water or well-draining soil.
Change water every two to four weeks when rooting in water. For leaf cuttings, take individual leaves, allow them to callus, then plant them stem-down in moist potting mix. New rhizomes and roots can take several months to develop.
Common ZZ Oscura Problems
Common issues with ZZ Oscura often stem from improper care. Yellowing leaves frequently signal overwatering, but can also indicate underwatering or insufficient light. Mushy stems or root rot indicate excessive watering and poor drainage, requiring immediate action like repotting into dry soil.
A lack of new growth might suggest inadequate light or nutrients, or simply reflect the plant’s slow growth rate. If the characteristic dark coloration does not develop, it suggests insufficient light. While generally pest-resistant, ZZ Oscura can occasionally encounter spider mites, mealybugs, and aphids, which can be managed with regular inspection and neem oil treatment.