The Fishbone Cactus, scientifically known as Epiphyllum anguliger, is a popular houseplant known for its distinctive zigzagging stems. Its flattened, green, fleshy stems resemble a fish’s skeleton, hence its common name. Originating from Mexican rainforests, this epiphytic cactus grows on other plants, absorbing moisture and nutrients. Its unique appearance and easy care make it a popular choice for plant enthusiasts.
The Fishbone Cactus Bloom Cycle
The Fishbone Cactus blooms from late summer into autumn (September to November). Its large, fragrant flowers are nocturnal, opening at night. They are typically white or creamy, sometimes with pale yellow or greenish hues, measuring 4 to 8 inches across. Their intense, sweet scent attracts nocturnal pollinators like moths and bats.
Individual flowers are ephemeral, lasting one to two days. A healthy plant can produce multiple blooms throughout the season. Young cacti typically need a few years to mature before flowering.
Key Conditions for Blooming
To encourage blooming, provide environmental conditions that mimic its natural rainforest habitat. Bright, indirect light is crucial for flowering. Insufficient light hinders bloom production. Place the plant near a north or east-facing window indoors for optimal growth.
Temperature significantly impacts blooming. During the active growing season, it thrives between 61-77°F (16-25°C). To initiate flower buds, provide a cool winter rest at 50-60°F (10-16°C) for several weeks. This signals the plant to develop flowers.
Proper watering is important. During the spring and summer growing season, water regularly, allowing the topsoil to dry between waterings. Unlike desert cacti, it prefers consistently moist, but not soggy, soil. In winter dormancy, significantly reduce watering, letting the soil become almost completely dry. Overwatering, especially then, can inhibit blooming.
It benefits from moderate to high humidity (around 60%). In drier indoor environments, misting or a humidity tray helps. Fertilization supports health and flower production. During the growing season, use a low-nitrogen, high-phosphorus fertilizer every 4-6 weeks, as phosphorus promotes flowers. Stop fertilizing in late summer or early fall to prepare for dormancy.
What to Do If Your Cactus Isn’t Blooming
If a Fishbone Cactus isn’t blooming, its environmental needs may not be met. Insufficient light is a common reason. Move a dimly lit plant to bright, indirect light to encourage blooming. Thin, round stems also suggest inadequate light.
Another frequent cause is the lack of a cool, dry rest period during autumn and winter. Without this dormancy, the plant may not form flower buds. Ensure temperatures drop to 50-60°F (10-16°C) and reduce watering during these months to trigger flowering.
Incorrect watering, like overwatering, can inhibit blooms and lead to root rot. Allow the soil to dry between waterings, especially in winter.
Nutrient deficiencies or improper fertilization also impact flowering. Inadequate phosphorus or over-fertilization with nitrogen can affect bloom production. Resume fertilization with a low-nitrogen, high-phosphorus formula when new growth or buds appear. Finally, younger plants may simply need more time to mature, as it can take three or more years to reach blooming age.