FFF677 - CEREUS

Cereus is a genus of cacti (family Cactaceae) including around 33 species of large columnar cacti from South America. The name is derived from Greek (κηρός) and Latin words meaning "wax" or "torch". The genus Cereus was one of the first cactus genera to be described; the circumscription varies depending on the authority. The term "cereus" is also sometimes used for a ceroid cactus, any cactus with a very elongated body, including columnar growth cacti and epiphytic cacti.

Cereus are shrubby or treelike, often attaining great heights (C. hexagonus, C. lamprospermus, C. trigonodendron up to 15 m). Most stems are angled or distinctly ribbed, ribs 3–14, usually well developed and have large areoles, usually bearing spines. Flowers are large, funnelform, 9–30 cm long, usually white, sometimes pink, purple, rarely cream, yellow, greenish, and open at night. Fruits are globose to ovoid to oblong, 3–13 cm long, fleshy, naked, usually red but sometimes yellow, pulp white, pink or red. Seeds large, curved ovoid, glossy black.

The specimen illustrated here is Cereus paraguyanus, and it is presently in full bloom. This plant is from my neighbourhood in inner suburban Melbourne, just to prove how well suited our climate is to the growth of this cactus in our city. 

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FFF619 - RED ORCHID CACTUS

Disocactus is a genus of epiphytic cacti in the tribe Hylocereeae found in Central America, the Caribbean and northern South America. It should not be confused with Discocactus, which is a different genus. Species of Disocactus grow in tropical regions either on trees as epiphytes or on rocks as lithophytes.

They have two distinct growth habits. Species such as D. phyllanthoides have stems which are round at the base but then become flattened and leaflike. Many of the cultivated plants known as epiphyllum hybrids or just epiphyllums are derived from crosses between species of Disocactus (rather than Epiphyllum) and other genera in the Hylocereeae.

The one illustrated here is blooming in our garden at the moment and is probably a Disocactus × jenkinsonii is a hybrid between Disocactus phyllanthoides and Disocactus speciosus. It is perhaps the most commonly grown orchid cactus and seems to survive and flower under most conditions. It has a very complex taxonomic history and has been mistaken for Disocactus ackermannii for a long time.

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FFF518 - SCHLUMBERGERA

Schlumbergera is a small genus of cacti with six species found in the coastal mountains of south-eastern Brazil. Plants grow on trees or rocks in habitats which are generally shady with high humidity and can be quite different in appearance from their desert-dwelling cousins.

Most species of Schlumbergera have stems which resemble leaf-like pads joined one to the other and flowers which appear from areoles at the joints and tips of the stems. Two species have cylindrical stems more similar to other cacti. In Brazil, the genus is referred to as Flor de Maio (May flower), reflecting the period in which they flower in the Southern Hemisphere. It is also called Easter cactus.

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FFF312 - EPIPHYLLUM HYBRID

The plants known as epiphyllum hybrids, epiphyllums, epicacti or just epis, widely grown for their flowers, are artificial hybrids of species within the group of cacti placed in the tribe Hylocereeae, particularly species of Disocactus, Pseudorhipsalis and Selenicereus. In spite of the common name, species in the genus Epiphyllum are less often involved as parents of epiphyllum hybrids.

The parent species from which epiphyllum hybrids were bred are different in appearance and habit from most cacti. They are found in the tropical forests of Central America where they grow as climbers or on trees as epiphytes. They have leafless (or apparently leafless) flattened stems which act as the plant's photosynthetic organs. Relatively large flowers are borne on the sides of the stems; in many species they open at night. Hybrids between Disocactus and Epiphyllum have been called ×Disophyllum or ×Aporophyllum. The Epiphyllum Society of America (the International Registration Authority for hybrids of the Tribe Hylocereeae) maintains a list of epiphyllum hybrids (and Hylocereeae species) which contained over 7,000 names in 1996.

Epiphyllum hybrids need different treatment from semi-desert cacti. They should be protected from direct sunlight, with preferably 75% shading at midday. They are not frost hardy, so need to be protected from freezing conditions. It is recommended that the growing medium allows rapid drainage of water and is open, with at least one third of coarse material to prevent compaction. Plants should be kept moist. High nitrogen fertilisers are not recommended; no fertiliser should be given during the winter rest period.

Propagating epiphyllum hybrids from cuttings is easy. Rooting hormone can be applied to the base of the cutting before it is allowed to dry for ten days or more so that the cut forms a callus. The cutting is then planted sufficiently deeply so that it can stand upright. Water is not given for two weeks, after which the growing medium is kept at least slightly moist. Plants can be misted. They are fast growing plants and should flower within two years. Epiphyllum hybrids should be re-potted every 2 to 3 years as they tend to deplete the nutrients in their growing medium.

We have about half dozen different Epiphyllum hybrids growing in pots and they do quite well outside in Melbourne's climate. All of them we have grown from cuttings, and I am not aware of their "official" name. This pink one is quite spectacular with blooms about 20 cm in diameter. They last a few days (up to seven) on the plant and they can even be cut at the base of the stem as a cut flower that lasts 4-5 days indoors.

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FFF207 - EASTER CACTUS

Hatiora gaertneri is a species of epiphytic cactus within the family Cactaceae. Together with the hybrid with H. rosea, Hatiora ×graeseri, it is known as Easter cactus or Whitsun cactus and is a widely cultivated ornamental plant. H. gaertneri is found in southeastern Brazil, in Paraná and Santa Catarina, at altitudes of 350–1,300 m. As with other species of the genus, H. gaertneri grows on trees (epiphytic) or less often rocks (lithophytic) in tropical rain forests.

With maturity, it develops into a branching pendant leafless shrub with a woody base. The stems are made up of segments, most of which are flattened and which are the photosynthetic organs (cladodes) of the plant. Structures characteristic of cacti, called areoles, form in these notches. Flowers form from areoles at the ends of the stems. These are scarlet in colour, 4–5 cm long, radially symmetrical (actinomorphic), opening to a funnel shape with a maximum diameter of about 4–7.5 cm. Red oblong fruits form after the flowers are fertilised.

Under the name Easter cactus or Whitsun cactus, Hatiora gaertneri is widely cultivated as an ornamental plant for its scarlet flowers. Its common names reflect the period in which it flowers in the Northern Hemisphere, namely late Spring. It has been artificially crossed with a pink-flowered species, Hatiora rosea, to form the hybrid H. × graeseri, cultivars of which have flowers in a wider range of colours. The Easter cactus is considered more difficult to grow than the Christmas or Thanksgiving cactus (Schlumbergera).

Recommendations for care include:

Temperature Summer temperatures around 25 °C are suggested, with lower temperatures down to 7–13 °C in the winter (November to January in the Northern Hemisphere) to initiate good bud formation.

Light As epiphytic forest plants, they are not exposed to strong sunlight. Half-shade is recommended; plants can be placed outside in the summer.

Watering The Easter cactus is said to respond badly to over- or under-watering, e.g. by losing stem segments; continuously moist soil is recommended.

Propagation Stem segments may be removed in late Spring and the cut surface allowed to dry out before being placed in slightly moist soil.

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FFF177 - EASTER CACTUS

Hatiora gaertneri is a species of epiphytic cactus which belongs to the tribe Rhipsalideae within the subfamily Cactoideae of the Cactaceae family. Together with the hybrid with H. rosea, Hatiora × graeseri, it is known as the Easter Cactus or Whitsun Cactus and is a widely cultivated ornamental plant.

H. gaertneri is found in southeastern Brazil, in Paraná and Santa Catarina, at altitudes of 350–1,300 m. As with other species of the genus, H. gaertneri grows on trees (epiphytic) or less often rocks (lithophytic) in tropical rain forests. With maturity, it develops into a branching pendant leafless shrub with a woody base. The stems are made up of segments, most of which are flattened and which are the photosynthetic organs (cladodes) of the plant. Younger segments are dullish green, 4–7 cm long and 2–2.5 cm wide, with small notches on the margins. Structures characteristic of cacti, called areoles, form in these notches.

Flowers form from areoles at the ends of the stems. These are scarlet in colour, 4–5 cm long, radially symmetrical (actinomorphic), opening to a funnel shape with a maximum diameter of about 4–7.5 cm. Red oblong fruits form after the flowers are fertilised.

The Easter Cactus is considered more difficult to grow than the Christmas or Thanksgiving Cactus (Schlumbergera). Recommendations for care include:
Temperature: Summer temperatures around 25 °C are suggested, with lower temperatures down to 7–13 °C in the winter (November to January in the Northern Hemisphere) to initiate good bud formation.
Light: As epiphytic forest plants, they are not exposed to strong sunlight. Half-shade is recommended; plants can be placed outside in the summer.
Watering: The Easter Cactus is said to respond badly to over- or under-watering, e.g. by losing stem segments; continuously moist soil is recommended.
Propagation: Stem segments may be removed in late Spring and the cut surface allowed to dry out before being placed in slightly moist soil.

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FFF168 - BARREL CACTUS

Echinocactus grusonii, popularly known as the Golden Barrel Cactus, Golden Ball or, amusingly, Mother-in-Law's Cushion, is a well known species of cactus, and is endemic to east-central Mexico. It is rare and critically endangered in the wild, where it is found near Mesa de Léon in the state of Querétaro, and in the state of Hidalgo. The population was critically reduced in the 1990s, by the creation of the Zimapán Dam and reservoir in Hidalgo. The cactus grows in volcanic rock on slopes, at altitudes around 1,400 metres.

Growing as a large roughly spherical globe, Echinocactus grusonii may eventually reach over 1 metre in height after many years. Younger Golden Barrel plants do not look similar to mature specimens. The generation lifetime is estimated to be 30 years. There may be up to 35 pronounced ribs in mature plants, though they are not evident in young plants, which may have a knobbly appearance. The sharp spines are long, straight or slightly curved, and various shades of yellow or, occasionally, white. Small yellow flowers appear in summer around the crown of the plant, but only after twenty years or so.


Echinocactus grusonii is widely cultivated by specialty plant nurseries as an ornamental plant, for planting in containers, desert habitat gardens, rock gardens, and in conservatories. It is one of the most popular cacti in cultivation. The cactus is considered easy and relatively fast growing in warmer climates around the world. The plants do have some basic requirements; an average minimum winter temperature of 12°C; and good drainage with less watering in winter. Excess water in cool periods may lead to rot. Golden Barrels are hardy to about -8ºC for brief periods. Beyond Central Mexico, Echinocactus grusonii specimens may also be seen in collections of desert plants in many botanical gardens, such as this specimen in the Melbourne Botanical Gardens.

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FFF76 - EPIPHYLLUM

Epiphyllum crenatum is a species of cactus and one of the most important parents in creating the Epiphyllum-hybrids commonly cultivated throughout the world. It is cultivated for its beautiful diurnal flowers. It is found naturally from Mexico (Oaxaca & Chiapas) to Honduras. It is epiphytic (grows upon another plant) or lithophytic (grows on rocks) in moist or wet forests, sometimes in oak forests (1.750 m alt. or less).

It is an easily cultivated, fast growing epiphyte. Needs compost containing plenty of humus and sufficient moisture in summer. Should not be kept under 12°C in winter. Can be grown in semi-shade or full sun. Extra light in the early spring will stimulate budding. Flowers in late spring or early summer.

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