Cactaceae

Multi-ribbed, blue-green columnar stems with brown spines. One of the fastest-growing columnar cacti for indoor use. Can reach 1m+ indoors over several years with adequate light. The blue-green coloration is most vivid in direct sun. In lower light it becomes greener and growth becomes etiolated and structurally weak. Stem cuttings root reliably after a few days of callusing.

A genetic mutation affecting the growing tip produces irregular, lumpy, fasciated growth instead of the standard ribbed column. Each plant's form is unique and changes as it grows. Slower than the standard form. The abnormal growth is stable. It will not revert to the standard form. Identical care to standard repandus.

Clusters of small, finger-like stems that sprawl and trail. One of the most free-flowering cacti for indoor growing — produces numerous vivid orange-red flowers in spring with adequate light and a proper winter rest. Propagates extremely easily from the small stem segments that detach readily. A genuinely rewarding cactus for beginners — the flowering performance relative to care effort is exceptional.

Globose, nearly spineless with large white nocturnal flowers. One of the more elegant Echinopsis for indoor display. The near-spineless form makes it safer to handle than most cacti. The large white flowers open in the evening and last 1-2 days. Requires the winter dry rest for reliable flowering.

Large, intensely fragrant white flowers that open at night and last only a single evening. One of the most dramatic flowering events of any houseplant. Requires patience — plants need several years to reach flowering maturity. Flat, strap-like stems, more water than desert cacti, and bright indirect rather than direct light. The single-night flowering is worth planning for — the scent is extraordinary and the flowers are around 25-30cm across.

Deeply notched, zig-zag flat stems unlike any other cactus in common cultivation. Produces fragrant white to pale yellow flowers. The unusual stem form is the primary ornamental appeal, visible year-round rather than only when in flower. One of the most widely sold Epiphyllum in recent years. Same jungle cactus care as oxypetalum.

Small, ribbed globose cactus. Produces pink flowers. More tolerant of lower light than most cacti — one of the few desert cacti that performs reasonably in medium indirect light. Good for indoor positions that cannot offer maximum direct sun.

A mutant form entirely lacking chlorophyll, appearing vivid red, orange, yellow, or pink. Cannot survive on its own — it is grafted onto a green cactus rootstock (usually Hylocereus) that provides photosynthesis. The colorful ball is the Gymnocalycium; the green base is a different cactus entirely. The graft has a finite lifespan. The Gymnocalycium may outlive the rootstock, requiring re-grafting. Does not require direct sun — the chlorophyll-free top cannot use it and the rootstock is what needs light.

Clustering columns of cylindrical stems covered in golden-yellow spines. One of the most free-flowering Mammillaria — small yellow or white flowers in spring produced in a ring around the upper stem. Easy and fast-clustering, forming substantial clumps over time. The golden spine color is most vivid in maximum direct light.

Dense white silky hairs covering a globose body with hooked spines hidden beneath. The soft, fluffy appearance belies the hooked spines — handle carefully. The hooks catch on skin and fabric. Produces pink or white flowers in a ring. One of the most visually distinctive Mammillaria due to the soft hair covering.

Dense, long white hairs covering a globose body. The most heavily haired common Mammillaria. Produces a ring of small pink-red flowers. Requires maximum light to maintain the dense hair covering — in lower light the hairs become sparser and the plant loses its characteristic woolly appearance.

Flat oval pads without large spines but covered in clusters of yellow, white, or rusty-orange glochids. The pads resemble bunny ears, deceptive given the irritating glochids that cause persistent skin and eye irritation on contact. The glochids detach on the lightest touch and are almost impossible to remove individually. Handle only with thick gloves. Do not place where children or pets can brush against it. Requires maximum indoor light for compact growth.

Vivid powder-blue columnar stems with golden-yellow spines and white woolly areoles. The color contrast is exceptional. Requires maximum direct indoor light to maintain the blue coloration. In lower light it becomes progressively greener and loses the quality that makes it distinctive. Growth is relatively slow indoors but the plant is striking at any size.

Thin, cylindrical, pale green stems that trail in long curtains. The most widely distributed Rhipsalis and the only cactus species native outside the Americas. Produces tiny white flowers followed by white mistletoe-like berries. The trailing form is one of the most elegant hanging plant options in the family — particularly striking displayed from a high shelf where the stems can hang freely.

Short, branching stems in a more three-dimensional, bush-like trailing form. More compact than baccifera. Better suited to smaller hanging baskets where the branching habit reads as full rather than sparse. White flowers. Care identical to baccifera.

Stems covered in fine bristles — the most textured surface of the commonly available Rhipsalis. The bristly covering gives it a distinctly different tactile quality. Produces white flowers with a slight fragrance. Care identical to baccifera. The texture makes it the most visually unusual of the three listed species.

Stem segments with pointed, claw-like margins — this is the key identification feature distinguishing it from bridgesii (Christmas Cactus). Flowers earlier in the season. Available in red, orange, pink, white, and yellow. The flowering trigger is a drop in temperature and day length in autumn — move to a cooler position and reduce watering in September to encourage bud formation.

Stem segments with rounded, scalloped margins — smoother than truncata's claw-like points. Flowers slightly later in the season. Most plants sold as Christmas Cactus are actually truncata — the rounded segment margin is the reliable distinguishing feature. Care is identical to truncata.