The difference between drought tolerant and drought resistant plants?

arizona desert bush orange and yellow flowers

Define drought tolerant.  What is a drought resistant plant? Here is the difference between drought tolerant (true desert plant) and drought resistant (originated in semi-arid places).

A flower or plant that has naturally evolved to survive periods of drought with little water and has the ability to tolerate substantial dehydration of their tissues and organs is drought tolerant.  Xerophytes are the BEST drought tolerant plants, shrubs, trees, and cacti.

cactus plants use little water are heat tolerant
Drought tolerant Saguaro Cactus and Prickly Pear Cactus

Cacti and many plants survive on little water and make Xeriscape not only essential but pleasing to the eye. Derived from the Greek word “xeros”, meaning “dry” and combined with landscape, xeriscape means gardening with less than average water.

drought resistant landscape yard
flowering, hairy cactus with drought tolerant agave plants

Many xerophyte plants have specialized tissues for storing water, as in the stems of cacti and the leaves of succulents. Others have thin, narrow leaves, or even spines, for minimizing water loss.  Xerophyte leaves often have abundant stomata to maximize gas exchange during periods in which water is available, and the stomata are recessed in depressions, which are covered with fine hairs to help trap moisture in the air.

drought resistant tolerant bushes in yard design
xeriscape yard with XEROMORPHIC plants like cactus, yucca, ocotillo

Drought tolerant plants have adapted by making use of either C4 Carbon Fixation or CAM (crassulacean acid metabolism) a carbon fixation pathway that evolved in some plants as an adaptation to arid conditions.

xerophyte plants best drought resistant
A drought tolerant Joshua Tree and Yucca Cactus in this photo

In a plant using full CAM, the stomata, in the leaves, remain shut during the day to reduce the loss of water as vapor, but open at night to collect carbon dioxide (CO2). The CO2 is stored and then used during photosynthesis, which is the process of capturing the suns energy.

what is drought tolerant and resistant plants
Saguaro cactus and Palo Verde Tree are well – adapted drought tolerant plants.

CAM is particularly good for arid conditions because CO2 can be absorbed at night, allowing the pores on the leaves to stay closed during the day and thus reducing water loss. A easy way to explain it is drought tolerant plants can slow down metabolism.

Blue agave cactus plant with spike leaves in desert
Lovely Agave titanota BLUE variety

High elasticity of the cytoplasm and the capacity to withstand compression of the cells during dehydration are characteristic of drought-tolerant plants. What is cytoplasm? An easy definition of cytoplasm is a gel-like casing, covering – containing all the contents of the cell’s organisms, except the nucleus. Most metabolic (chemical reactions) pathways occur in the cytoplasm.

ocotillo tall cactus for drought tolerant yard arizona
Ocotillo Cactus plant in the desert

Not to be confused with drought-tolerant plants, Drought Resistant plants are not true desert plants. Many have originated in semi-arid regions, the area around the Mediterranean, Latin America and sub-Sahara.

Here are pictures of drought resistant plants that are not native desert plants.

color ideas for your desert low water, garden
colors of flowering lantana drought resistant plants next to oleander bushes

Lantana

drought tolerant and heat resistant flowering plants of the desert
The New Gold Lantana along with Trailing Purple Lantana plants
drought tolerant flowering lantana plants
White, Red (Texas) and Gold Lantana drought resistant desert plants

Lantana, in the verbena family, is a highly attractive drought resistant flowering plant that originated in tropical regions of Africa and the Americas.

drought tolerant and heat resistant purple lavender plant
lavender shrub is drought resistant

Lavender

top best drought tolerant flowering plants
young lavender drought resistant plant

This plant has it all: Drought resistant, it looks great, it smells wonderful, and it’s as tough as nails (as long as it’s not too wet).  Lavender is in the mint family and originated in the Old World around the Canary Islands, Africa, India, and Asia.

best drought tolerant heat resistant desert plants
Yarrow, yellow flowering drought resistant plants

Yarrow

Not only does yarrow tolerate heat and drought like a champion, but this easy-growing perennial is also a great cut flower.  Yarrow, Achillea millefolium, originated in regions of Asia and Europe.

best drought tolerant heat resistant desert plants
Yarrow (Achillea millefolium) drought resistant plants

There is a difference between drought resistant and drought tolerant plants. Knowing the difference can save you considerable heartache.

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Author: tjsgarden

We are a family that loves the Arizona Desert. A lot of research and team efforts go into our articles and photos. Come discover the beauty and mystery with us. Don't forget your sunscreen!

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