Epiphyllum hookeri subsp. guatemalense (Britton & Rose) Ralf Bauer
Epiphyllum guatemalense, Epiphyllum phyllanthus subsp. guatemalense, Epiphyllum phyllanthus var. guatemalense, Phyllocactus guatemalensis
Epiphyllum hookeri subsp. guatemalense, also known as Epiphyllum guatemalense, is a climbing cactus that produces a loose mass of long flat spineless branches modified to function as leaves. Mature plants produce big, fragrant white flowers in summer. The flowers open only at night and close by morning.
USDA hardiness zones 9b to 11b: from 25 °F (−3.9 °C) to 50 °F (+10 °C).
How to Grow and Care
Epiphyllums are hardy to about 50 °F (10 °C) but require at least 60 °F (15 °C) during the growing season, so they are best grown in a heated greenhouse, conservatory, or indoors. Place the pots in bright, filtered light with moderate to high humidity. To increase the humidity, position the pot on a tray filled with gravel and keep this topped up with water, but not enough so that the water reaches the surface. These cacti require sharply-drained growing media. Grow them in a standard cactus soil with added grit or perlite. Alternatively, mix 3 parts loam-based compost with 2 parts grit or perlite and 1 part peat-free multipurpose compost.
Overlong stems can be cut off or shortened. New shoots will usually develop just behind the cut. However, be careful not to overwater after pruning as the plant's water requirements will be reduced. Large Epiphyllums can become unstable in their pots. Either repot into a heavier pot, such as terracotta, or a wider container, such as a pan. Alternatively, try using canes and tying the stems up, but this can look unsightly.
Learn more at How to Grow and Care for Epiphyllum.
This subspecies is native to Guatemala, Honduras, and Mexico.
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