The night blooming cereus is a cactus that holds little interest until you see the flower. Two types of plants are given the name of night blooming cereus in the genera Selenicereus and Hylocereus. They are both vining cacti, Hylocereus being the larger and more vigorous grower. The blooms from this plant are white, funnel-shaped flowers that can be as large as 12 inches across and only open at night. They are mostly found as a houseplant as they don't like temperatures under 55 degrees and are not difficult to grow. They can only be planted in the ground in U.S. gardening zones 10b, 11 or warmer locations.
Choose a location that gets either morning sun and afternoon shade or dappled sunlight throughout the day. The location should be in a high area of your landscape because if cacti get waterlogged they will rot.
Dig a hole slightly larger than the container you purchased the night blooming cereus in. Use the dug out soil in another part of your landscape and fill a couple inches of the hole with a specialty cactus soil.
Install a trellis behind the hole. You should do this before planting the cactus or you may injure the roots during the installation.
Remove the plant from the container carefully and set it in the hole. Adjust the soil so the plant is at the same level it was in the container. Fill in around the plant with the cactus soil and hand tamp down.
Water the plant completely to establish the roots. Water to keep the soil moist until blooms stop coming out in the fall. Then discontinue watering until spring.
Fertilize once a month in spring through late summer with a water soluble specialty cactus fertilizer. Refer to manufacturer's directions for amount to use.