The true Christmas cactus — the hybrid Schlumbergera x buckleyi — a long-lived epiphytic holiday cactus grown indoors almost everywhere for its arching, segmented stems and its rose-to-magenta flowers that open in mid-winter, around Christmas. It is worth getting the identity right, because most plants sold and labeled as 'Christmas cactus' are actually the Thanksgiving cactus, Schlumbergera truncata. You can tell the two apart by the edges of the flat stem segments and by when they bloom: the true Christmas cactus has rounded, scalloped segment margins and flowers a few weeks later, in mid-winter, while the Thanksgiving cactus has sharp, claw-like teeth and blooms from late fall into early winter. Unlike a desert cactus, this is a forest epiphyte that grows on tree branches in the Atlantic coastal forest of southeastern Brazil, so it wants bright indirect light, a free-draining mix, sparing water, and — to set its buds — cool nights and short days. A reassuring point that sets it apart from many houseplants: it is non-toxic to cats and dogs.

A spring-flowering bulb grown for dense upright spikes of waxy, star-shaped florets in blue, purple, pink, red, or white — famous for an intense, sometimes overpowering fragrance. Plant bulbs in mid-fall for an April bloom; flower quality typically declines after the first year, so the densest spikes often need replanting every couple of seasons. Every part of the bulb is mildly toxic and the sap can cause contact dermatitis, so gloves are advised when planting.

An evergreen, clump-forming shade perennial grown for its bold rounded heads of funnel-shaped orange (or yellow) flowers held on stout stalks above arching, strap-shaped, dark-green leaves in late winter and spring. Known respectfully as the Natal lily, bush lily, or simply clivia, it is one of the finest plants for dry shade in frost-free gardens and a classic houseplant everywhere else. Native to South Africa — the Cape provinces, KwaZulu-Natal, and Eswatini (POWO, Kew) — it is frost-tender (hardy roughly in USDA zones 9b-11) and is grown in a container or as a houseplant wherever winters dip below freezing. Two things are load-bearing: grown indoors it needs a cool, dry winter rest of about six to eight weeks kept cool and barely watered to set flower buds, then warmth and water to bloom; and every part is toxic (lycorine and related alkaloids) to people and pets if eaten, with sap that can irritate skin. It resents disturbance and flowers best when slightly pot-bound, so it is happiest left alone in the same pot for years.

One of the most popular and forgiving foliage houseplants — an evergreen tropical perennial grown indoors for its glossy, dark-green, lance-shaped leaves and elegant white "flowers." Those flowers are not true showy blooms but a white leafy hood, the spathe, wrapped around a creamy spadix. POWO (Kew) places Spathiphyllum wallisii native to the tropical rainforests of Colombia and Venezuela; it is now grown worldwide as an indoor foliage plant. Honesty matters here. It is famously easy: it tolerates LOW light and conveniently droops when thirsty, then recovers after a watering. But every part contains insoluble calcium-oxalate crystals and is TOXIC to cats, dogs, and people if chewed, so keep it away from pets and small children. And its celebrated "air-purifying" reputation, from a 1989 NASA chamber study, is OVERSTATED — at realistic room densities the effect on indoor air quality is negligible. Grow it for its looks and easy care, not as an air purifier. RHS rates it frost-tender, H1B, a tender evergreen for shade and indoor culture under glass.

A long-lived epiphytic cactus from the Atlantic coastal forest of southeastern Brazil, grown indoors almost everywhere for its arching, segmented stems and its showy late-fall and winter flowers in hot pink, magenta, red, orange, salmon, or white. It is the plant most often sold and labeled as a 'Christmas cactus,' but the confusion is near-universal and worth getting right: this is the Thanksgiving, crab, or claw cactus, with sharp, claw-like teeth on the edges of its flat stem segments and a bloom season that runs from late fall into winter. The true Christmas cactus is a different plant, the hybrid Schlumbergera x buckleyi, which has smooth, rounded segment margins and blooms a few weeks later. Unlike a true desert cactus, it is a forest epiphyte that grows on tree branches in dappled light, so it wants bright indirect light, a free-draining mix, sparing water, and — to set its buds — cool nights and short days. A reassuring point that sets it apart from many houseplants: it is non-toxic to cats and dogs.

The famous carnivorous bog plant — a low clumping rosette of hinged, jaw-like snap-traps fringed with stiff "teeth" that close on insects that touch their trigger hairs. Despite its worldwide fame and houseplant ubiquity, Dionaea muscipula is native to a single tiny region: the wet, fire-maintained pine savannas and bogs within roughly a 75-mile radius of Wilmington, North Carolina (and adjacent South Carolina). It is globally rare in the wild and poaching of wild plants is a serious, criminalized conservation problem, so buy only nursery-propagated stock. It is also far more demanding than its reputation suggests: it needs nutrient-poor acidic peat-and-sand soil, mineral-free water, full sun, and a genuine cool winter dormancy — and it declines and dies if treated as an ordinary warm year-round houseplant.