How to Care for a Fishbone Cactus

The fishbone cactus (Disocactus anguliger, often sold under its older name Epiphyllum anguliger and nicknamed the zigzag cactus or ric rac cactus) is one of those plants that fools people into killing it with kindness, or rather with the wrong kind of kindness. It looks like a cactus, so the instinct is to park it on a hot windowsill and water it once a month. Do that and you will end up with a shriveled, sunburned mess. Here is the single most important thing to understand before you do anything else: this is an epiphytic jungle cactus, not a desert cactus. In the wild it grows on tree branches in the humid forests of southern Mexico, its roots tucked into pockets of leaf litter rather than baking in sand. That one fact reshapes every care decision you make, from how often you water to where you place it and what you pot it in. Treat it like its rainforest cousins the orchid cactus and the holiday cacti, and those flat, deeply notched stems will reward you with a cascading, sculptural plant that eventually throws out enormous, fragrant, night-blooming flowers.

Light

Bright, indirect light is the sweet spot. In its native canopy the fishbone cactus sits in dappled shade, shielded from the harsh tropical sun by the leaves above it, and your home should mimic that filtered brightness. An east-facing window is close to perfect: it delivers a few hours of gentle morning sun, which the plant enjoys, followed by softer light for the rest of the day. North-facing windows work too, though growth will be slower and blooms less likely. South and west windows are usable but only if you pull the plant two to four feet back from the glass or diffuse the light with a sheer curtain. The stems are flat and chlorophyll-rich, and they sunburn easily; once you see pale yellow or bleached white patches, that tissue is dead and will not green up again.

Too little light is the more common problem, and it shows up as long, thin, weak segments with shallow notches instead of the dramatic deep zigzag pattern. A plant in a dim corner will survive but stay green and flowerless indefinitely. If your space is short on natural light, a basic LED grow light running 10 to 12 hours a day fills the gap nicely. Rotate the pot a quarter turn every couple of weeks so the trailing stems grow evenly rather than all reaching toward one bright side.

Watering

Forget everything you know about watering desert succulents. The fishbone cactus wants noticeably more water than a barrel cactus or an echeveria, because in the rainforest it gets regular rainfall and its thin epiphytic roots dry out fast. The reliable method is soak and dry: water deeply until liquid runs freely from the drainage holes, let the pot drain completely, then wait until the top inch to inch-and-a-half of the mix feels dry before watering again. Stick a finger in or use a wooden skewer to check rather than guessing from the surface.

In practice that usually means watering about once a week during the active growing season of spring through early fall, though warm rooms and small pots may push that to twice a week. In late fall and winter you should deliberately cut back, watering perhaps every two to three weeks, just enough to keep the stems from wrinkling. This winter dry-down is not neglect; it is part of triggering blooms, which I will come back to. The cardinal sin is letting the pot stand in a saucer of water. Soggy roots invite rot, which shows as soft, translucent, yellowing or browning segments starting near the base. If you see that, unpot immediately, trim away any mushy roots, and repot into fresh dry mix. Rainwater, distilled, or filtered water is appreciated since the plant is mildly sensitive to the mineral and chlorine buildup found in hard tap water, but it is not strictly required.

Humidity and Temperature

Coming from a humid forest, this plant is happiest at 50 to 60 percent relative humidity. Most homes hover around 30 to 40 percent, especially in winter when heating systems dry the air, so a little intervention helps the plant look its best. A small room humidifier near the plant is the most effective and consistent fix. Grouping it with other houseplants raises the local humidity through their combined transpiration, and a pebble tray with water sitting below (not touching) the pot adds a bit more. Misting feels productive but does almost nothing lasting and can encourage fungal spots if the stems stay wet, so skip it as your main strategy. The fishbone cactus tolerates average household humidity perfectly well; the higher levels simply produce plumper, healthier stems.

On temperature, treat it like a comfortable houseguest: it thrives in the 65 to 80°F range that most people keep their homes at year-round. It can handle a brief dip to the mid-50s, and a cool spell in winter actually benefits flowering, but anything sustained below 50°F risks cold damage, and frost will kill it outright. Keep it away from cold drafts near doors and windows in winter, and equally away from hot, dry blasts from heating vents and radiators. If you summer it outdoors, choose a shaded porch or under a tree, and bring it back inside well before night temperatures approach 50°F in the fall.

Soil and Potting

Because its roots evolved to grip mossy bark and leaf debris rather than dense ground, the fishbone cactus needs a mix that is rich enough to hold some moisture and nutrients but airy enough to drain fast and never compact. A standard bagged cactus mix is too lean and gritty on its own; a standard potting soil is too dense and stays wet too long. Blend your own and you will get far better results. A reliable recipe is two parts quality potting mix, one part orchid bark, and one part perlite or pumice. For extra moisture retention you can fold in a handful of coco coir or a small amount of horticultural charcoal to keep things sweet. The goal is a loose, chunky medium that water rushes through while leaving the bark and coir slightly damp.

Always pot into a container with drainage holes; a decorative cachepot is fine only if you lift the inner nursery pot out to water and drain. These plants flower better when slightly root-bound, so resist the urge to size up too aggressively. Repot every two to three years, or when roots circle the bottom and emerge from the drainage holes, choosing a pot just one to two inches larger in diameter. Spring, as new growth begins, is the best time. A terracotta pot helps wick away excess moisture and suits the plant’s preference for breathable conditions. Feed during the growing season with a balanced or slightly low-nitrogen liquid fertilizer diluted to half strength every two to four weeks; switching to a higher-phosphorus bloom formula in late summer encourages flowering. Stop feeding entirely over winter.

How to Get It to Bloom

The reward for good care is spectacular. A mature fishbone cactus produces large funnel-shaped flowers, typically white or pale yellow, that open in the evening and release a heady, almost intoxicating fragrance overnight before fading within a day or two. Blooming usually happens in the fall. The catch is that the plant must be mature enough, generally at least two to three years old, and must be coaxed with the right conditions, because flowering is tied to its natural seasonal rhythm.

The key trigger is a distinct winter rest period. Starting in late fall, move the plant somewhere cooler, ideally with night temperatures around 50 to 60°F, reduce watering to the bare minimum that keeps the stems from shriveling, and stop fertilizing. Give it this cool, dry, slightly stressed dormancy for six to eight weeks. Equally important is uninterrupted darkness at night during this period; like its relative the holiday cactus, it sets buds in response to long nights, so keep it away from lamps and other artificial light after dark. When you resume normal watering and warmth in late winter or early spring, the plant interprets it as the return of the rainy season and is far more likely to set buds. Once buds form, do not move or rotate the plant, as the sudden change in light orientation can cause it to drop them. Adequate bright indirect light throughout the year and that bloom-boosting phosphorus feed round out the recipe.

Propagation

This is one of the most forgiving plants to multiply, which is why cuttings circulate so freely among houseplant people. Take a healthy stem segment four to six inches long, cutting cleanly with sterilized scissors or a knife, ideally where one zigzag section meets the next. The single most important step is to let the cutting callus before it touches soil: set it in a dry, shaded spot for three to seven days until the cut end dries over and forms a firm seal. Skipping this is the fastest route to a rotted cutting.

Once callused, lay or insert the cut end about an inch deep into a pot of barely moist, well-draining mix, the same blend you would pot a mature plant in. Keep it in bright indirect light and resist watering heavily; mist the surface or water lightly only when the top dries, since a callused cutting with no roots cannot drink much yet. Roots typically form within three to six weeks, and you will know it has taken when you feel resistance on a gentle tug or spot fresh new growth at the tip. From there, transition to a normal watering routine. Spring and summer are the best seasons to propagate, when the plant’s growth energy is highest. You can also root cuttings in water, but soil-rooted plants tend to transition more smoothly and are less prone to the shock that water-to-soil moves sometimes cause.

Common Problems and Pests

Most trouble traces back to watering. Wrinkled, limp stems usually mean the plant is thirsty or, less often, that the roots have rotted and can no longer take up water, so always check the roots if a good drink does not perk it up within a day. Yellowing, soft, mushy segments point to overwatering and root rot; the cure is to unpot, cut away dead roots and tissue, and repot into fresh dry mix while easing off the watering can. Bleached or scorched patches indicate sunburn from too much direct light, and brown, crispy stem edges can come from low humidity or fertilizer salt buildup, which a thorough flush of the soil will relieve. If your plant simply refuses to flower, the culprit is almost always insufficient light, a missing winter rest period, or a plant that is still too young.

On the pest front, watch for the usual indoor offenders. Mealybugs appear as small white cottony tufts tucked into the notches and where stems join; dab them with a cotton swab dipped in 70 percent isopropyl alcohol, then follow up with insecticidal soap or neem oil. Scale shows up as small brown immobile bumps along the stems and is treated the same way, scraping them off and spraying. Spider mites cause fine stippling and faint webbing, and they thrive in dry air, which is one more reason to keep humidity up; rinse the plant and treat with neem. Fungus gnats, those tiny black flies hovering around the pot, signal soil that stays too wet, so let the mix dry out more between waterings, top it with a layer of sand, and set out yellow sticky traps. Inspect new plants and quarantine them for a couple of weeks before introducing them to your collection. For a deeper look at why stems and segments lose their color, our guide on why a cactus turns yellow walks through the most common causes and fixes.

Toxicity

Here is good news for animal lovers: the fishbone cactus is non-toxic and considered pet-safe for both cats and dogs. It contains none of the irritating compounds found in many popular houseplants, so a curious nibble will not poison your pet. That said, the trailing stems can be tempting for a playful cat to bat at, and chewing on any plant can cause mild stomach upset simply from the fiber, so it is still worth hanging it where paws and jaws cannot reach. Its safe profile and dramatic cascading shape make it a great choice for homes where toxic plants are off the table. If you are building out a pet-friendly, low-worry collection, browse more options and care guides in our Plants & Flowers hub, and if you like the look of unusual cacti, the moon cactus care guide covers another eye-catching, beginner-friendly pick.