Cactus

What does Cactus look like?

Cacti come in many shapes and sizes, from small round plants to tall, branching columns and even tree-like forms. Most have thick, fleshy stems that store water, and are covered with spines instead of leaves. Their stems are often ribbed or fluted, and can be green, bluish, or brownish. Flowers grow from special spots called areoles, and are usually tubular with many petals. Some cacti have visible leaves, but most do not.

Where does Cactus come from?

Cacti are native to the Americas, found from the southern tip of South America (Patagonia) all the way to western Canada. They have adapted to survive in very dry places like deserts, especially the Atacama Desert. The family name comes from the Greek word 'kaktos,' used by Theophrastus for a spiny plant. Most cacti evolved to store water in their stems and reduce water loss, which helped them spread across arid regions.

When and how Cactus blooms

Cacti grow in areas with short rainy seasons and long dry spells. They quickly absorb water through shallow, wide root systems when it rains, and store it in their stems. Most are grown from seeds, but some can be propagated from cuttings. Their spines come from areoles, and flowers also emerge from these spots. Some cacti grow as epiphytes on trees in tropical forests, while others form dense mounds or climb.

How Cactus is used

People grow cacti as ornamental plants in gardens and homes, especially for their unusual forms and flowers. Some species are used for food, particularly their fruits, and others are grown as animal fodder. The cochineal insect, which lives on some cacti, is used to produce a red dye. Cacti are also used in traditional medicine in some cultures.

Kinds of Cactus

There are about 1,750 species of cacti, divided into groups like opuntias (prickly pears) and cactoids. Some, like saguaro and Pachycereus, grow tall and tree-like, while others, such as Mammillaria, are small and globular. A few, like Pereskia and Leuenbergeria, have leaves and look more like regular shrubs or trees. Epiphytic cacti, such as Schlumbergera, have flattened stems and few spines.

What Cactus means

Cacti are symbols of arid landscapes and are often used as emblems in regions like Mexico. They are popular in gardens for their drought resistance and striking appearance. Some cacti, like the saguaro, are iconic in art and media. The family includes species important for food, dye, and traditional uses. Cacti are sometimes confused with other spiny succulents, but true cacti have unique areoles.

Where Cactus is used and seen

Parc floral de ParisA botanical garden and flower park in the Bois de Vincennes, ParisDomaine du RayolA botanical garden by the sea in southern France with plants from five continentsFlor og FjæreTropical-inspired gardens and restaurant on Sør-Hidle island, NorwayAnza-Borrego Desert State ParkCalifornia’s largest state park, famous for spring wildflower blooms and desert landscapesSan Diego Botanic GardenA 37-acre garden in Encinitas with global plant collections and rare bamboosBogotá Botanical GardenColombia’s largest botanical garden, focused on Andean and Páramo plantsNong Nooch Tropical Botanical GardenA vast tropical garden and plant collection near Pattaya, ThailandOrman GardenA historic botanical garden in Giza with a spring flower festival

Questions people ask about Cactus

Good reading and sources

• Encyclopaedia BritannicaArticle
• Windstorm Fells 78-Foot Cactus--Tallest in WorldLos Angeles Times, Article
• Plants of the World OnlineRoyal Botanic Gardens, Kew, Plant database
• Where it has been recordedGBIF, Plant database
• Sightings and photos by naturalistsiNaturalist, Plant database

• Cactus on WikipediaEncyclopedia
• More photos on Wikimedia CommonsPhotos
• Wikidata recordOpen data