Follow these instructions from expert Francisca Coehlo of the New York Botanical Garden to make your own contemporary cactus garden. Be sure to handle the cacti very carefully, using special gloves and spring-loaded thongs with ends wrapped in duct tape. If you do get pricked, use tweezers to get the spines out of your skin.
Tabletop Cactus Garden How-To
1. Select a container to plant the cacti into: The container should be shallow with drainage holes; terracotta or porous material is best. Cover drainage hole with a pottery shard or a small piece of landscape fabric.
2. Use a growing medium specific for cacti, or you can make your own. To make your own, mix together 2 parts potting soil, 1 part sand, and 1 part perlite. Fill your container with a shallow layer of this soil mixture.
3. Arrange cacti in the container. Fill container with the soil mixture, firming it down around the roots of the cacti. Surface mulch with a thin layer of fine gravel or stones, and lightly water.
Tip: Cacti need water when they are actively growing. Watering should begin after their period of dormancy, when new growth begins to show due to higher light levels and warmer temperatures -- this is usually around late February to early March. Watering should be slight at first then more regular through the spring and early summer months. As growth progresses, watering should be about once a week for small plants and once every two weeks to a month for medium and larger plants. In mid to late summer, when growth begins to slow down due to higher temperatures, watering should be lessened to about every eight to 10 days for small plants and longer for larger ones.
Proper light, temperature, humidity, and air circulation are necessary for optimum cacti growth. Cacti will thrive in warm temperatures of 65 degree nights and up to 90 degree days with good air circulation. They need very bright light -- a south-facing window in a home will suffice for some species. For optimum growth, humidity should be 25 to 40 percent.
Cacti grow in semi-dry and dry areas in deserts, savannah areas, and under the canopy of tropical rainforests in North and South America. Cactus leaves are modified into spines, bristles, and hairs that reduce transpiration or water loss and shade the plant from strong sunlight.
A unique characteristic of cacti is the appearance of specialized organs called areoles from which flowers and modified leaves originate.
Cacti seen on the show:
Native to Arizona, California, and Mexico, this is the largest and most protected cactus of all 2,000 species, growing to 46 feet tall or more and living for about 200 years. The stem is columnar with 12 to 24 ribs. The areoles are positioned at the top of the stems and produce blooms of white that open at night in early summer. This cactus grows extremely slow and is not a suitable houseplant due to the extremely high light requirements year round.
Stenocactus Multicostatus syn. Echinofossulocactus Multicostatus
Native to Mexico, this is an unusual bluish-green globular plant that features about 30 wavy ridges. The plant is small, growing to about 3 inches high and 4 inches wide in its natural habitat. The areoles are yellowish with many white spines and about four larger brown weapon-type ones protruding from the center. It blooms in the spring in the daytime with pale pink to whitish flowers, and each flower has a solid purplish line down the center of each petal.
Cactaceae Espostoa Melanostele
This unique cactus has leaves modified into hairs to reduce transpiration and shade the plant.
Native to Brazil, this is one of the few cactus species with a cephalium. The melon thistle has a globular shape and at maturity is about 6 inches high and wide. It is dark green in color with about 13 ribs, nine red or brown radial spines, and four central spines. This cactus blooms in early summer with flowers that are small and pink to red in color.
This is a flowering cactus. Most cacti tend to flower once a year after their rest period in the winter, blooming in spring and early summer, some for more than a period of a month or more. Many are day-flowering, but a few species, especially those native to South America, tend to bloom at night.
Astrophytum Myriostigma var. Columnare
Native to north and central Mexico, this is a beautiful, columnar-shaped cactus that has no spines. The plant grows up to 10 inches high and about 4 inches or more wide. There are about seven to eight prominent ribs along the stem, which is covered with whitish-gray scales. This cactus blooms in the early summer, in the daytime, with flowers that are about 2 to 3 inches long and wide when fully open and yellow with a red blotch in color.
Pereskia Aculeata var. Godseffiana
Native to Florida, the West Indies, and Brazil, this is the only cactus genus bearing true leaves -- they grow to 3 inches long. It is a climbing, trailing plant with stems that can grow beyond 33 feet. The plant blooms in the daytime in early summer and has whitish-yellow flowers that fade to pink.