The main types of cactus houseplants fall into two groups: desert cacti such as bunny ears, golden barrel, pincushion and bishop’s cap, which want several hours of direct sun and very dry winters, and jungle (rain forest) cacti such as Christmas, Thanksgiving, Easter, orchid and mistletoe cactus, which want bright filtered light and more regular moisture. Pick the group that matches your brightest window first, then choose the species by size and look.
This guide covers 20 true cacti that are sold as houseplants, three popular “cacti” that are actually toxic Euphorbias, a side-by-side comparison table, a troubleshooting table, and a season-by-season care calendar. For general watering and potting technique, see our companion guide to cactus plant care.
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Desert Cacti vs. Jungle Cacti: Which Type Suits Your Home?
All true cacti belong to the family Cactaceae, but they come from very different habitats, and that habitat decides how you grow them indoors.
Desert cacti
- Light: bright sun, ideally a south- or west-facing window with several hours of direct sun a day. A grow light can make up the difference in a dim room.
- Temperature: about 65–85°F during the growing season and a cooler 45–55°F winter rest, which encourages flowering.
- Water: water thoroughly from about March through September, letting the soil dry between waterings; in winter give only enough to keep the stems from shriveling, roughly every few weeks.
- Soil: a commercial cactus mix, or equal parts peat-based potting soil and very coarse sand or grit.
Jungle (rain forest) cacti
- Light: bright but filtered light. Strong direct sun can bleach or sunburn the stems.
- Water: noticeably more than desert types. In spring and summer the mix should never dry out completely, but it must never stay waterlogged either.
- Humidity: they prefer about 50% humidity or more.
- Soil: a looser, more organic mix, for example 1 part sterile potting soil, 2 parts peat moss and 1 part sharp sand or perlite.
Most jungle cacti grow on trees in the wild, so many have flat, segmented or trailing stems instead of spiny columns and look best in hanging baskets or on a high shelf.
Indoor Cactus Types at a Glance: Comparison Table
Sizes are typical for container plants grown indoors; most species are slow and take years to reach them. Pet notes refer to the ASPCA Animal Poison Control plant list where a species is listed. “Not listed” means the ASPCA has no entry for it, not that it is proven safe. Every true cactus with spines or glochids can injure a curious pet’s mouth, nose or paws.
| Common name | Botanical name | Size indoors | Light | Watering | Bloom indoors | Pet notes |
|---|---|---|---|---|---|---|
| Bunny ears cactus | Opuntia microdasys | Up to about 2 ft tall and wide | Full sun | Desert schedule | Uncommon indoors | ASPCA: non-toxic; glochids (tiny barbed bristles) lodge in skin and fur |
| Golden barrel cactus | Echinocactus grusonii | Tabletop globe for many years | Full sun | Desert schedule | Rare; needs a mature plant | Not listed; stiff, sharp spines |
| Barrel cactus | Ferocactus spp. | Usually 5–6 in across, eventually a foot or more | Full sun | Desert schedule | Possible on older plants | Not listed; hooked, strong spines |
| Sea urchin cactus / star cactus | Astrophytum asterias | Small, flat dome | Bright sun | Desert schedule; very rot-prone | Yellow; often after about 5 years | Not listed; spineless |
| Bishop’s cap | Astrophytum myriostigma | Small to medium globe | Bright sun, shade young plants from harsh sun | Desert schedule | Yellow, spring | Not listed; spineless |
| Pincushion cacti (powder puff, old lady, snowball) | Mammillaria spp. (e.g. M. bocasana, M. hahniana, M. candida) | Small; many form clusters | Full sun to bright light | Desert schedule | Yes; rings of small flowers | Not listed; some species have hooked spines |
| Moon cactus | Gymnocalycium mihanovichii (grafted) | Small colored ball on a green rootstock | Bright, filtered light | Desert schedule | Occasional | Not listed; short spines |
| Old man cactus | Cephalocereus senilis | Slow column | Full sun | Desert schedule | Not expected indoors | ASPCA: non-toxic; spines hidden under the white hair |
| Fairy castle cactus | Acanthocereus tetragonus ‘Fairy Castle’ (often sold as Cereus tetragonus) | Cluster of small columns | Full sun to bright light | Desert schedule | Rare indoors | Not listed; small spines |
| Column cactus | Cereus uruguayanus (sold under several Cereus names) | 3–6 ft | Full sun | Desert schedule | Uncommon indoors | Not listed; sharp spines |
| Prickly pear | Opuntia spp. | Varies widely by species | Full sun | Desert schedule | Uncommon indoors | Not listed (bunny ears is non-toxic); spines and glochids |
| San Pedro cactus | Echinopsis pachanoi (syn. Trichocereus pachanoi) | Fast-growing column; needs headroom | Full sun | Desert schedule | Rare indoors | Not listed; contains mescaline, so keep away from pets and children |
| Cholla | Cylindropuntia spp. | Better outdoors | Full sun | Desert schedule | Rare indoors | Not listed; spiny joints break off and cling, a real hazard in homes with pets |
| Thanksgiving cactus | Schlumbergera truncata | Arching stems, compact pot plant | Bright, filtered | Jungle schedule | Late fall | Not listed separately; the closely related Christmas cactus is listed non-toxic |
| Christmas cactus | Schlumbergera × buckleyi (listed by ASPCA as S. bridgesii) | Arching stems, compact pot plant | Bright, filtered | Jungle schedule | Winter | ASPCA: non-toxic to dogs, cats and horses |
| Easter cactus | Schlumbergera gaertneri (syn. Hatiora / Rhipsalidopsis gaertneri) | Compact, bushy | Bright, filtered | Jungle schedule; dry rest in winter | About April to late May | ASPCA lists “Easter cactus” as a name for its non-toxic Christmas cactus entry |
| Orchid cactus / queen of the night | Epiphyllum spp. (e.g. E. oxypetalum) | Long, flat, sprawling stems | Bright, filtered | Jungle schedule | Flowers 6 in or longer, often from 2–3-year-old plants | Not listed |
| Fishbone cactus | Disocactus anguliger (syn. Epiphyllum anguliger) | Trailing zigzag stems | Bright, filtered | Jungle schedule | Occasional | Not listed |
| Rat tail cactus | Disocactus flagelliformis | Trailing stems up to about 6 ft | Bright sun | Between desert and jungle; cool, drier winter | Pink, spring | Not listed; fine bristly spines |
| Mistletoe cactus | Rhipsalis baccifera (ASPCA lists R. cassutha) | Trailing, pencil-thin stems | Bright, filtered | Jungle schedule | Tiny cream flowers, then white berries | ASPCA: non-toxic; spineless |
Best Desert Cacti for Sunny Windows
Desert cacti are the classic choice for a bright south- or west-facing sill. Most stay small for years, which makes them easy to group in shallow bowls.
Bunny ears cactus (Opuntia microdasys)
Bunny ears grows in flat, oval pads dotted with fuzzy-looking tufts. Those tufts are glochids, barbed bristles that come off at a touch and are hard to remove from skin, so handle it with folded newspaper or tongs. It can reach about 2 feet tall and wide, and the ASPCA lists it as non-toxic to pets.
Golden barrel cactus (Echinocactus grusonii)
A bright green globe with ribs of golden spines, this is one of the most forgiving desert cacti for beginners. It grows slowly in a pot and blooms only when mature, so buy it for its form rather than its flowers.
Barrel cacti (Ferocactus spp.)
Ferocactus species are usually 5–6 inches in diameter in containers and can eventually pass a foot. Devil’s tongue (F. latispinus) reaches roughly 10 inches tall and 15 inches wide, with broad, hooked spines that call for leather gloves when repotting.
Sea urchin cactus and bishop’s cap (Astrophytum)
These are the best choices if you want a cactus without spines. The sea urchin cactus (Astrophytum asterias), also sold as star cactus, is a low, ribbed dome flecked with white dots; it tends to flower after about five years. Bishop’s cap (A. myriostigma) is a spineless star-shaped globe with yellow spring flowers. A related plant, A. ornatum, is also called star cactus; it is spherical when young and becomes columnar with age, and it does have spines. All Astrophytum species rot easily, so they need a gritty mix and careful watering.
Pincushion cacti (Mammillaria spp.)
Mammillaria is the largest genus of small cacti sold as houseplants. Popular choices include powder puff (M. bocasana), snowball (M. candida), old lady cactus (M. hahniana) and rose pincushion (M. zeilmanniana). Many produce a ring of small flowers around the crown, which makes them among the most reliable indoor bloomers. Some, like powder puff, have hooked central spines that snag fabric and fur.
Moon cactus (Gymnocalycium mihanovichii)
The red, orange or yellow ball on a moon cactus has little or no chlorophyll, so it cannot feed itself and is grafted onto a green rootstock. Give it bright but filtered light and keep it above about 48°F.
Old man cactus (Cephalocereus senilis)
Long white hairs cover this slow column and hide sharp spines underneath. It needs full sun and a very dry winter. The ASPCA lists it as non-toxic.
Fairy castle cactus (Acanthocereus tetragonus ‘Fairy Castle’)
This cultivar forms a cluster of short, upright columns of different heights, like a miniature skyline. It is usually sold as Cereus tetragonus and rarely flowers indoors.
Column cactus (Cereus)
Columnar Cereus, sold under names such as C. uruguayanus and C. peruvianus, can reach 3–6 feet indoors and makes a bold floor plant beside a sunny glass door. Use a heavy clay pot so the plant does not tip.
Cacti better suited to large rooms or the outdoors
Some popular cacti are sold as houseplants but are hard to keep in an average room:
- Prickly pear (Opuntia spp.): many species grow large and spread quickly; choose a compact type such as bunny ears for indoors.
- San Pedro cactus (Echinopsis pachanoi): a fast-growing column that needs full sun and headroom. It contains mescaline, so keep it where pets and children cannot chew it.
- Cholla (Cylindropuntia spp.): segments detach at a light touch and cling to skin and fur. It is best kept in a garden away from walkways.
Best Jungle Cacti for Bright, Indirect Light
If your best window faces east, or a sunny window is screened by a sheer curtain, jungle cacti are a better fit than desert types. Most are spineless or nearly so.
Christmas, Thanksgiving and Easter cactus (Schlumbergera)
These holiday cacti have flat, jointed stems and bloom in white, pink, red, orange or purple. You can tell the two fall bloomers apart by the stem edges: Thanksgiving cactus (S. truncata) has pointed teeth along each segment, while Christmas cactus (S. × buckleyi) has smoother, scalloped edges. Easter cactus (S. gaertneri) flowers from about early April to late May and needs a cool, dry rest from December through late March.
Holiday cacti are short-day plants. Thanksgiving and Christmas cacti need about six weeks of long nights and cool temperatures to set buds:
- At night temperatures around 55°F, they usually bloom in about 5–6 weeks almost regardless of day length.
- At 60–65°F, they need at least 12 hours of complete darkness every night for about six weeks.
- Above 65°F at night, blooming is unlikely.
Once buds appear, leave the plant where it is. Moving it to a warmer room, drafts, heater vents and sudden temperature swings are common causes of bud drop. The ASPCA lists Christmas cactus as non-toxic to dogs, cats and horses. For more easy flowering plants for a bright room, see our list of low-maintenance indoor plants.
Orchid cactus and queen of the night (Epiphyllum)
Orchid cacti have long, flat, strap-like stems and produce some of the largest flowers of any houseplant, often 6 inches or longer, usually once plants are 2–3 years old. Queen of the night (E. oxypetalum) opens fragrant white flowers at night that fade by morning. They bloom best when slightly root-bound.
Fishbone cactus (Disocactus anguliger)
Grown mainly for its deeply notched, zigzag stems, fishbone cactus looks best trailing from a hanging pot. Treat it like an orchid cactus: bright, filtered light and a loose mix that stays lightly moist in summer.
Rat tail cactus (Disocactus flagelliformis)
Thin, bristly stems can trail to about 6 feet, with bright pink flowers in spring. It tolerates more sun than most jungle cacti, and a cool, slightly drier winter rest helps it bloom.
Mistletoe cactus (Rhipsalis)
Mistletoe cactus forms cascades of pencil-thin, spineless stems and small white berries. It copes with less light than desert cacti, and the ASPCA lists mistletoe cactus (Rhipsalis cassutha) as non-toxic, making it a good hanging plant for homes with cats. If you like trailing plants, our guide to growing string of turtles covers another compact, pet-friendly choice.
Plants Sold as “Cactus” That Are Not Cacti
Several succulents in garden centers are labeled “cactus” but belong to the spurge genus Euphorbia. They look similar, but their milky sap is an irritant, which matters if you have pets or young children. A quick check: true cacti grow their spines from small, fuzzy cushions called areoles and do not ooze milky sap; Euphorbias have no areoles, and most bleed white latex when cut.
- Pencil cactus (Euphorbia tirucalli): the ASPCA lists it as toxic to dogs, cats and horses. The sap irritates the mouth and stomach and can cause vomiting and drooling, and sap in the eyes can cause serious irritation.
- African milk tree (Euphorbia trigona): North Carolina State Extension rates its poison severity as medium. The sap can cause skin rashes, blisters and severe eye irritation, and swallowing plant parts can cause vomiting and diarrhea. It is a tall plant that wants bright, indirect light indoors.
- Candelabra cactus (Euphorbia lactea): another branching spurge with sticky, irritating sap.
Wear gloves and eye protection when pruning or repotting these plants, and wash tools afterward. Other common succulents are toxic too: the ASPCA lists jade plant and snake plant as toxic to pets, while aloe vera is also on its toxic list.
Indoor Cactus Care Essentials
Potting mix and containers
- Use pots with drainage holes. Unglazed clay dries faster than plastic, which helps desert cacti.
- Desert cacti: a commercial cactus mix, or equal parts peat-based potting soil and very coarse sand or grit. Our guide to making your own potting soil explains the basic ingredients.
- Jungle cacti: a looser, more organic mix such as 1 part sterile potting soil, 2 parts peat moss and 1 part sharp sand or perlite.
Watering
- Water deeply until it drains, then empty the saucer. Never leave a cactus standing in water.
- Desert cacti: water when the mix is dry during spring and summer; in winter, water only enough to prevent shriveling.
- Jungle cacti: water when the surface starts to dry; do not let them dry out completely in the growing season.
Fertilizing
- Desert cacti: a low-nitrogen fertilizer (such as 5-10-5) monthly from June to September, or a slow-release product once in spring. Skip winter feeding and do not feed right after repotting.
- Holiday cacti: a balanced houseplant fertilizer at half strength monthly from about June through August. Orchid cacti can be fed monthly from spring through fall; use too little rather than too much.
Repotting
Cacti prefer being slightly pot-bound. Repot desert cacti only when needed, ideally in April, into a pot just one size larger, and wait several days before watering so damaged roots can heal. Protect your hands with heavy leather gloves or wrap the plant in several layers of newspaper. Holiday cacti need repotting only about every three years.
Troubleshooting: Symptom, Cause, Fix
| Symptom | Likely cause | Fix |
|---|---|---|
| Soft, mushy, dark base or stem | Root or stem rot from overwatering or slow-draining soil | Stop watering, unpot, cut away soft tissue, let the cut dry and repot in fresh gritty mix. Badly rotted plants can sometimes be saved by rooting a healthy top piece. |
| Thin, pale, stretched growth leaning toward the window | Too little light | Move to a brighter window or add a grow light; increase direct sun gradually. |
| Yellow, white or tan scorched patch on the sunny side | Sunburn after a sudden move into strong light | Shade the plant and reintroduce stronger light over a couple of weeks. Scars do not heal, but new growth will be normal. |
| Wrinkled, shriveled stems | Underwatering, or roots lost to rot | Water thoroughly; if the plant does not plump up within days, check the roots for rot. |
| Holiday cactus drops its buds | Drafts, heater vents, sudden temperature or humidity changes, moving the plant after buds form, or excess water | Keep it in one cool, bright spot away from vents once buds appear and let the mix dry slightly between waterings. |
| Holiday cactus will not bloom | Nights too warm or room lights on at night in fall | Give about six weeks of cool nights near 55°F, or 12 or more hours of complete darkness nightly at 60–65°F. |
| Holiday cactus stems turn pale or reddish | Too much direct sun or drought stress | Move to bright, filtered light and check watering. |
| White cottony tufts in crevices or on roots | Mealybugs | Isolate the plant; treat with insecticidal soap or a houseplant spray labeled for cacti, following the label. |
| Fine webbing and pale speckling | Spider mites | Isolate, rinse the plant and treat with insecticidal soap or a labeled spray. |
| Hard brown or tan bumps that scrape off | Scale insects | Pick off light infestations by hand; heavily infested plants may need to be discarded. |
Seasonal Care Calendar for Indoor Cacti
| Season | Desert cacti | Jungle and holiday cacti |
|---|---|---|
| Spring (March–May) | Resume regular watering in March as days lengthen. Repot in April if needed. Increase light gradually to avoid sunburn. | Easter cactus blooms from about April to late May. Increase watering on Christmas and Thanksgiving cacti as new growth starts. |
| Summer (June–August) | Water when the mix is dry. Feed with low-nitrogen fertilizer monthly from June. Plants moved outdoors need gradual exposure to full sun. | Feed at half strength monthly. Holiday cacti can summer outdoors in part shade with about 3–6 hours of sun. Keep the mix lightly moist. |
| Fall (September–November) | Last feeding in September. Start cutting back water as temperatures drop. | Reduce watering around the end of September. Provide about six weeks of long, cool nights to set buds; Thanksgiving cactus blooms in late fall. |
| Winter (December–February) | Rest at about 45–55°F in bright light. Water only enough to prevent shriveling. No fertilizer. | Christmas cactus blooms; once buds form, avoid moving it. Water less after flowering. Keep Easter cactus cool and fairly dry from December to late March. |
How to Choose the Right Cactus
- Check your light first. Several hours of direct sun suits desert cacti; bright, indirect light suits holiday, orchid, fishbone and mistletoe cacti.
- Plan for mature size. Small Mammillaria, Astrophytum and moon cacti fit a sill; columnar Cereus and San Pedro need floor space and headroom.
- Consider who shares the room. With pets or toddlers, favor spineless plants like Astrophytum, Rhipsalis and holiday cacti, and skip Euphorbia look-alikes and glochid-covered Opuntia.
- Inspect before buying. Look for firm stems with no soft spots, and check crevices and the soil line for mealybugs or scale.
FAQ
What is the easiest cactus to grow indoors?
For a sunny window, golden barrel cactus, bunny ears and most Mammillaria species are forgiving choices. For bright, indirect light, Christmas and Thanksgiving cacti and mistletoe cactus are the easiest.
Are indoor cacti safe for cats and dogs?
Many true cacti, including Christmas cactus, bunny ears, old man cactus and mistletoe cactus, are listed as non-toxic by the ASPCA, but spines and glochids can still injure pets. Plants sold as “cactus” that are actually Euphorbia, such as pencil cactus and African milk tree, have irritating sap and should be kept out of reach. If you suspect your pet ate a toxic plant, call your veterinarian or the ASPCA Animal Poison Control Center at (888) 426-4435.
How often should I water an indoor cactus?
There is no fixed schedule; it depends on light, pot size and temperature. Water desert cacti thoroughly when the mix has dried during spring and summer, and only enough to prevent shriveling in winter. Jungle cacti need water more often and should not dry out completely in summer.
Can a cactus grow in a north-facing window?
Desert cacti usually stretch and weaken in a north window unless you add a grow light. Jungle cacti such as Rhipsalis, fishbone cactus and holiday cacti cope much better with bright, indirect light.
How do I tell a Christmas cactus from a Thanksgiving cactus?
Look at the edges of the stem segments. Thanksgiving cactus (Schlumbergera truncata) has sharp, claw-like teeth, while Christmas cactus has smoother, rounded scallops. Their care is the same.
Why is my cactus turning soft and yellow?
Softness, especially near the soil line, almost always points to rot from too much water or a mix that drains poorly. Check the roots, remove rotted tissue and repot in a gritty cactus mix.
Sources
- Clemson Cooperative Extension: Indoor Cacti
- University of Minnesota Extension: Holiday cacti
- NC State Extension Plant Toolbox: Euphorbia trigona
- ASPCA: Christmas Cactus and ASPCA: Pencil Cactus
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