Leaf Succulents: Leaves are almost entirely composed of water storage cells covered by a thin layer of photosynthetic tissue.
Stem Succulents: Fleshy stems contain water storage cells overlaid by photosynthetic tissue. Leaves are almost or entirely absent, reducing surface area to prevent evaporative loss of water.
Root Succulents: Swollen fleshy roots store water underground away from the heat of the sun and hungry animals. Stems and leaves are often deciduous and shed during prolonged dry seasons.
I always carry my camera with me to take photos of interesting plants, containers/troughs and landscapes. I found that I was taking a lot of pictures of what I traditionally think of as succulents. There are many plants—some that surprised me—that fit Wikipedia’s description of a succulent plant. In fact, “more than 60 plant families, split into some 300 genera, have evolved succulent species as an adaptation to limited availability of water. The best-known succulents are cacti. Virtually all cacti are succulents, but not all succulents are cacti.”
In addition to fleshy leaves and stems, succulents have other features to minimize water loss, which may include using stems instead of leaves for photosynthesis; compact, cushion-like growth; “ribs enabling rapid increases in plant volume and decreasing surface area exposed to the sun”; a waxy, hairy, or spiny outer surface to reduce, which also has the effect of shading the plant’s surface.
Succulents are much more cold-tolerant than many people assume. It’s more often poor drainage that causes their demise. Consider some of the less cold hardy varieties as care-free houseplants. I’m starting to use succulent plants, primarily Sedums and Sempervivums, in my deck and patio containers; very few have survived my wet soil.
Here’s a sneak peek at a hardy (Zones 5-9) Delosperma called Fire Spinner™ that will appear in this year’s New Varieties Showcase at the OAN-produced wholesale Farwest Tradeshow. I can’t wait to see it! It was discovered by Panayoti Kelaidis of the Denver Botanic Garden. It seems to be available in limited quantities from some online specialty nurseries.
Do you find succulent plants garden/houseplant worthy?
Sources: http://en.wikipedia.org/wiki/Succulent_plant and www.succulent-plant.com/succulent-plant-families.html