Orchid Cactus (Epiphyllum) and Night-Blooming Cereus (Selenicereus or Hylocereus) are both stunning, epiphytic cacti known for their spectacular nocturnal blooms. While they share similarities, they belong to different genera and exhibit distinct characteristics in terms of morphology, habitat, and flowering behavior. Below is a detailed comparison of these two plants.
Orchid Cactus (Epiphyllum): Belongs to the genus Epiphyllum within the Cactaceae family. These plants are primarily epiphytic, growing on trees in tropical and subtropical forests.
Night-Blooming Cereus: Refers to several genera, including Selenicereus (e.g., Selenicereus grandiflorus) and Hylocereus (e.g., Hylocereus undatus). These are also epiphytic or lithophytic cacti but differ genetically from Epiphyllum.
Stems: Orchid Cactus has flat, leaf-like stems with scalloped edges, adapted for photosynthesis. Night-Blooming Cereus, particularly Selenicereus, features ribbed, cylindrical, or angular stems with aerial roots.
Flowers: Orchid Cactus flowers are large (up to 8 inches wide), funnel-shaped, and often fragrant, with colors ranging from white to pink or red. Night-Blooming Cereus flowers are even larger (up to 12 inches), with elongated, tubular shapes and prominent stamens. Hylocereus flowers are typically white with greenish outer petals.
Spines: Orchid Cactus stems are mostly spineless or have tiny, hair-like bristles. Night-Blooming Cereus, especially Selenicereus, may have small spines along the stems.
Blooming Time: Both plants bloom at night, but Orchid Cactus flowers often last only one night, while some Night-Blooming Cereus species (e.g., Selenicereus grandiflorus) may remain open until dawn.
Frequency: Orchid Cactus may bloom multiple times a year under ideal conditions. Night-Blooming Cereus, particularly Selenicereus, often blooms once annually, with a highly anticipated display.
Orchid Cactus: Prefers humid, shaded environments with well-draining soil. It thrives in dappled light, mimicking its natural forest canopy habitat.
Night-Blooming Cereus: Tolerates a wider range of conditions, including brighter light and drier soils. Hylocereus species are often grown in arid regions and are the source of dragon fruit.
Orchid Cactus: Rarely produces edible fruit; when it does, the fruit is small and insignificant.
Night-Blooming Cereus: Hylocereus species are cultivated for their edible dragon fruit (pitaya), which is large, colorful, and rich in nutrients. Selenicereus fruits are less common but may be smaller and spiny.
Orchid Cactus: Requires regular watering during growth seasons but dislikes soggy soil. Benefits from high humidity and occasional fertilization.
Night-Blooming Cereus: More drought-tolerant and adaptable to varied light conditions. Hylocereus is often grown as a climbing cactus with support structures.
