How to Identify a Succulent: A Visual Field Guide to 20 Common Indoor Succulents

What counts as a succulent

A succulent is any plant that stores water in swollen leaves, stems, or roots to survive drought — the definition is functional, not taxonomic. That category cuts across several plant families that are not especially closely related. Crassulaceae gives us Echeveria, Sedum, Crassula, Kalanchoe, Aeonium, Graptopetalum and Sempervivum — the bulk of the rosette-and-chain succulents most people recognise. Asphodelaceae (the aloe family) contributes Aloe, Haworthia and Gasteria. Cactaceae is the all-American family of true cacti, distinguished by areoles — the cushion-like bumps from which spines, flowers and new growth emerge. Agavaceae (within Asparagaceae) contributes the agaves and the snake plants. Asclepiadoideae — a subfamily of Apocynaceae — gives us the string-of-pearls lineage (Senecio, Curio) and Hoya. Aizoaceae is the family of Lithops and the so-called "mesembs". Euphorbiaceae produces the spiny, milky-sapped Euphorbia species that are so often mistaken for cacti. Knowing which family a succulent belongs to is the single most useful ID shortcut — it narrows the species universe from thousands to dozens.

The 30-second decision tree

Before worrying about species, sort the plant into a family-level bucket. Answer these six questions in order and stop at the first "yes". Nineteen out of twenty plants labelled "succulent" in a shop resolve after question four.

• 1Does it have spines or bristles emerging from cushion-like bumps (areoles), and no true leaves? → Cactaceae (a true cactus). Areoles are the diagnostic feature of the cactus family; nothing else has them.
• 2Does it have thick upright stems with spines but also short-lived leaves, and does a cut exude milky-white sap? → Euphorbia — not a cactus despite looking like one. The latex is a reliable confirmation (and a mild toxin; wash it off skin).
• 3Is the plant a rosette — leaves radiating from a central point? → one of Echeveria, Aeonium, Sempervivum, Haworthia, Aloe, Gasteria or Graptopetalum. Question four splits those seven.
• 4Does the rosette have translucent "windows" on the upper leaf surface (the leaf tip looks glassy, almost like frosted plastic)? → Haworthia (usually H. cooperi or H. obtusa). Fenestration in succulents is rare and almost diagnostic for this genus.
• 5Does it trail on long, thin stems with bead-shaped, banana-shaped or heart-shaped leaves? → Senecio / Curio (string-of-pearls and string-of-bananas) or the unrelated string-of-hearts (Ceropegia woodii).
• 6Does it have a thick, slightly woody stem with a few branches and round-to-oval green leaves? → Crassula (jade) or Portulacaria afra (elephant bush). Leaf size and stem colour separate them; see the confused-pairs section.

How to take a good ID photo

Succulents defeat plant-ID apps more often than any other category because the distinctive features are small, the colours shift with sun exposure, and most apps are weighted toward flowers that indoor succulents rarely produce. Three photos solve most of it. First, place the whole plant flat against a neutral background (a plain wall, a sheet of paper, a pale worktop) and shoot from directly above — this captures the rosette or the overall growth habit. Second, photograph one single leaf from the side against the same neutral background, filling the frame, so the app can read leaf thickness, cross-section and any keel or ridge. Third, take a close-up of the growing point — the centre of the rosette, or the growing tip of a stem — where leaf arrangement, fine hairs, tubercles and fenestration live.

Shoot in bright indirect daylight, not direct midday sun (which blows out the pale Haworthia windows and the waxy farina on Echeveria). Avoid flash. If you intend to upload to a plant ID app afterwards, follow the fuller photo recipe in how to identify a houseplant from a photo — the same rules that work for monsteras work for echeverias.

The 20 most common indoor succulents — field guide

Each entry below covers the distinguishing features a photo should show, the species most often mistaken for it, and a care note. Binomial names follow [Kew's Plants of the World Online](https://powo.science.kew.org/) where genera have been reclassified — Haworthia, Senecio and Kalanchoe have all been partly split in recent years, and shop labels lag the science by a decade or more.

• 1Echeveria elegans (Mexican snowball). Tight rosette 8–15 cm across of pale blue-green, spoon-shaped leaves with rounded tips and a light silvery farina (powdery bloom). Lookalikes: Graptopetalum paraguayense (ghost plant) is a looser, flatter rosette with a pink blush; Echeveria 'Perle von Nürnberg' is larger and distinctly lavender. Care: 4–6 h direct sun, water every 3 weeks in summer; pet-safe.
• 2Echeveria 'Perle von Nürnberg'. Large hybrid rosette 15–20 cm across, leaves distinctly lavender-pink with a grey farina; the colour deepens in strong light. The name on the label alone usually confirms it, but the pinkish cast is the visual giveaway. Lookalikes: Graptoveria hybrids. Care: as E. elegans but tolerates brighter sun; pet-safe.
• 3Aloe vera vs Aloe aristata (lace aloe). Aloe vera: thick, fleshy green-to-blue-green leaves 30–60 cm long, soft serrations along the margin, clear gel inside when cut. Aloe aristata (now Aristaloe aristata): small rosette 10–15 cm across, dark green leaves covered in white tubercles, fine white soft teeth — often mistaken for Haworthia. Care: both want bright direct light; toxic to cats and dogs (see are houseplants toxic to cats and dogs).
• 4Haworthia fasciata / H. attenuata (zebra plant). Small firm rosette 6–10 cm across; dark green stiff pointed leaves with raised horizontal bands of white tubercles on the outer surface. H. fasciata has a smooth inner leaf face; H. attenuata has tubercles on both sides. Lookalikes: Aloe aristata (see above); H. limifolia (tubercles run lengthwise, not across). Care: bright indirect light, water every 3–4 weeks; pet-safe.
• 5Haworthia cooperi (window plant). Clustering rosette 5–8 cm across of fat, bulbous, almost translucent leaves with glassy "windows" on the upper tip — fenestration evolved so buried leaves still photosynthesise. Unmistakable once you see the windows. Care: bright indirect light (direct sun scorches the translucent tissue), water sparingly; pet-safe.
• 6Sempervivum tectorum (hens and chicks). Flat mat-forming rosette 5–12 cm across with red- or purple-tinged tips on blue-green leaves; produces visible offsets ("chicks") on short stolons around the parent. Fully hardy outdoors — the only succulent on this list that tolerates a Nordic winter on a balcony. Lookalikes: Echeveria (not frost hardy), Jovibarba. Care: full sun, water every 2–3 weeks; pet-safe.
• 7Sedum morganianum (burro's tail, donkey tail). Long trailing stems 30–60 cm densely packed with plump, blue-green, banana-shaped leaves 2 cm long that drop at the lightest touch. Lookalikes: Sedum burrito is shorter and has rounder, less-pointed leaves; Senecio rowleyanus is spherical not banana-shaped. Care: bright indirect to gentle direct light, water every 2–3 weeks; pet-safe.
• 8Sedum rubrotinctum (jelly bean plant). Small upright stems with fat jelly-bean leaves that flush red at the tips in strong light. Drops leaves easily and they root readily. Lookalike: Sedum pachyphyllum (leaves larger, less red). Care: 4+ h direct sun; mildly toxic to pets — sap irritates skin.
• 9Crassula ovata (jade plant). Tree-like shrub to 60–120 cm indoors; thick woody stem, paired opposite leaves, round to oval, glossy green, 3–5 cm long, often with red margins in bright light. Lookalikes: Portulacaria afra (see confused-pairs section). Care: bright direct light, water every 3 weeks; toxic to cats and dogs.
• 10Crassula perforata (string of buttons). Upright to 30 cm stems that appear to run straight through the centre of stacked pairs of triangular grey-green leaves — the stem literally threads the leaves like beads. Lookalike: Crassula rupestris (leaves rounder, more yellow). Care: as C. ovata.
• 11Gasteria spp. (ox tongue). Distichous (two-ranked) succulent — leaves grow in a flat fan, not a rosette. Dark green tongue-shaped leaves 10–20 cm long, often speckled with paler spots or tubercles. Lookalikes: Haworthia (rosette, not fan); Aloe (leaves thicker, serrated). Care: bright indirect to partial direct; tolerates lower light than most; pet-safe.
• 12Kalanchoe blossfeldiana (flaming Katy). Compact bushy plant 20–30 cm tall with dark green scalloped leaves and dense clusters of red, orange, pink, yellow or white four-petalled flowers. Bought flowering in supermarkets; the flowers are the ID. Care: bright light; toxic to cats and dogs — the cardiac glycosides are serious, see pet-safe houseplants.
• 13Kalanchoe tomentosa (panda plant). Upright stems 20–40 cm with oval, densely felted grey-green leaves tipped with chocolate-brown "ears" of darker hair. The fuzz is diagnostic among succulents. Lookalike: K. beharensis (much bigger, triangular leaves). Care: bright indirect to gentle direct; toxic to pets.
• 14Senecio rowleyanus / Curio rowleyanus (string of pearls). Trailing stems to 60 cm with perfectly spherical, pea-like leaves 6–9 mm across, each with a thin translucent stripe (a leaf window). Kew has moved it to Curio; most shops still say Senecio. Lookalikes: Senecio herreianus (leaves more oval, grape-sized). Care: bright indirect light, water sparingly — rots fast; toxic to pets.
• 15Curio radicans (string of bananas). Trailing stems with curved, banana-shaped pointed leaves 2–3 cm long, glossier and more elongated than rowleyanus. Easier indoors than string of pearls — more forgiving of watering errors. Care and toxicity: as C. rowleyanus.
• 16Aeonium arboreum (tree aeonium). Branching woody stem to 60–100 cm carrying one or more large flat rosettes 15–25 cm across of glossy green (or nearly black in the cultivar 'Zwartkop') spoon-shaped leaves. The loose, flat, almost daisy-like rosette distinguishes it from the cupped rosette of an Echeveria. Care: bright direct light, winter-growing — water more in cool months; pet-safe.
• 17Portulacaria afra (elephant bush). Small-leaved bushy shrub 30–90 cm indoors; the red-brown stem carries pairs of round, glossy, 1–2 cm bright green leaves. Much smaller leaves than Crassula ovata and the stem colour is different. Often trained as succulent bonsai. Care: bright light, water every 2–3 weeks; pet-safe and in fact non-toxic enough to be eaten (historically a goat fodder in South Africa).
• 18Lithops spp. (living stones). A pair of fused, pebble-shaped leaves 2–5 cm across with a patterned flat upper face, sitting nearly flush with the soil. Aizoaceae family — nothing else looks like this. Flowers through the split in autumn. Care: bright direct sun, water essentially only in spring and autumn, none in summer dormancy; pet-safe.
• 19Graptopetalum paraguayense (ghost plant). Loose, flat rosette 10–15 cm across of thick pointed leaves that shift from pale blue-grey in bright sun to pinkish-lavender in gentler light. Lookalike: Echeveria, but Graptopetalum rosettes are distinctly flatter and the leaves more triangular in profile. Care: bright direct light; pet-safe.
• 20Euphorbia trigona (African milk tree). Upright three- or four-sided green column to 60–150 cm with small spines along the ridges and short-lived teardrop leaves near the top. Often mis-sold as a cactus. Test: a nicked ridge exudes milky white sap (cacti do not). The cultivar 'Rubra' has burgundy leaves and stems. Care: bright light; toxic and a skin irritant — wash sap off immediately, do not get it in eyes.

The three most-confused pairs

These are the pairs that most often come back misidentified from an app or a well-meaning friend. Each has one or two features that settle the ID in seconds.

• ·Aloe vera vs Haworthia fasciata. Aloe vera has thick, soft, pale blue-green leaves 30–60 cm long with soft serrations along the margin and a clear watery gel inside. Haworthia fasciata is much smaller (6–10 cm), dark green, with stiff firm leaves carrying raised bands of white tubercles (bumps, not teeth) on the outer surface. A quick test: press the leaf. Aloe gives easily and feels full of gel; Haworthia feels hard, like a leaf-shaped piece of plastic. Aloe vera is toxic to cats and dogs; Haworthia is pet-safe — so the ID is also load-bearing for toxicity.
• ·Crassula ovata (jade) vs Portulacaria afra (elephant bush). Leaf size is the first tell: Crassula ovata leaves are 3–5 cm long, glossy, and slightly cupped; Portulacaria afra leaves are 1–2 cm, flatter, and crowded more densely on the stem. Stem colour second: Crassula has a pale tan woody stem that greys with age; Portulacaria has a distinctly reddish-brown stem, often almost burgundy in strong light. Growth habit third: Portulacaria is bushier and faster-growing, which is why it is the preferred subject for succulent bonsai. Crassula ovata is toxic to pets; Portulacaria is not — another case where the ID matters for more than bragging rights.
• ·Sedum morganianum (burro's tail) vs Senecio rowleyanus / Curio rowleyanus (string of pearls). Both are trailing, both have fleshy leaves, both are sold in hanging pots in the same aisle. But: Sedum morganianum's leaves are banana-shaped (pointed, longer than wide, 2 cm long, densely packed around the stem like scales); Senecio rowleyanus's leaves are perfect spheres, pea-sized, spaced along a thinner stem with visible gaps. Sedum drops leaves at the lightest touch; Senecio does not. Sedum is pet-safe; Senecio is toxic to cats and dogs.

What's NOT a succulent (but often mistaken for one)

A handful of popular houseplants are sold from the succulent shelf or share the same aesthetic, but technically are not succulents — or at least not in the way most people mean the word. Mis-classifying them usually means overwatering or underwatering based on the wrong model.

• ·ZZ plant (Zamioculcas zamiifolia). Stores water in an underground rhizome (tuber), not in leaves or stem — so it behaves like a succulent (drought-tolerant, slow) but the glossy leaflets are not fleshy. Most taxonomists call it a caudiciform rather than a true succulent.
• ·Snake plant (Dracaena trifasciata, formerly Sansevieria). Technically a leaf-succulent in Asparagaceae — the thick upright swords do store water — but snake plants are almost always sold on the foliage plant shelf, not the succulent one, and they tolerate far less light than most succulents want. Care as a foliage plant, not as a succulent, and it will be happier.
• ·"African milk tree" (Euphorbia trigona). Constantly mis-sold as a cactus. It is a Euphorbia: milky sap on a nick, no areoles, spines arranged on ridges rather than from cushions. Cactus care instructions mostly work anyway, but the toxicity profile is entirely different — the sap is a serious skin and eye irritant.
• ·"False aloe" / Agave species. Thicker, stiffer, and larger than any Aloe, with a fibrous rather than gel-filled leaf. Most Agaves quickly outgrow a windowsill; if your "Aloe vera" is putting out leaves over 60 cm long with fibres visible at a break, it is an Agave.

Care-at-a-glance differences across the 20

The clearest reason to identify a succulent correctly — beyond the pleasure of knowing what you own — is that care needs vary more across these twenty plants than most beginners realise. Lithops and Haworthia, for instance, are both on the same shelf and want almost opposite amounts of light. The practical differences cluster around three axes.

• ·Light. The majority want 4–6 hours of direct sun (south or west windowsill in the Northern hemisphere): Echeveria, Aeonium, Sedum morganianum, Sedum rubrotinctum, Crassula, Portulacaria, Graptopetalum, Aloe, Kalanchoe, Sempervivum, Lithops, Euphorbia. A smaller group prefers bright indirect light and scorches in midday sun: Haworthia cooperi, Haworthia fasciata, Gasteria. Full background on reading your windows is in understanding light levels.
• ·Water. The cross-species default is: soak the soil, then wait until it is completely dry before soaking again. In practice that is every 2–4 weeks in summer and every 6–8 weeks in winter for most of the twenty. The two outliers are Lithops (essentially no water in summer dormancy and near-dry in winter) and Aeonium (winter-growing Mediterranean genus that actually wants more water in cool months than in summer). For the general framework see how often to water houseplants.
• ·Pet-safety. Toxic to cats and dogs: Aloe (all species), Kalanchoe (all species — cardiac glycosides, genuinely dangerous), Crassula ovata, Euphorbia (plus skin irritation from the sap), Senecio / Curio rowleyanus. Generally pet-safe: Echeveria, Haworthia, Gasteria, Sedum morganianum, Sempervivum, Aeonium, Graptopetalum, Portulacaria, Lithops. Sedum rubrotinctum is mildly irritant rather than truly toxic. Before buying, cross-reference against are houseplants toxic to cats and dogs and the positive list in pet-safe houseplants.

When to stop identifying and just care for it

Getting to the exact species is satisfying, but most care decisions happen at the family level. Once you have a confident genus — Echeveria, Haworthia, Senecio, Crassula, Euphorbia — the species-level differences shrink to watering cadence by a week or two and light by one exposure. Five rules cover almost all of the twenty plants above and will keep a misidentified succulent alive long enough for you to figure out what it actually is.

• 1Pot in a gritty mix — two parts succulent compost to one part pumice, perlite or coarse horticultural grit. Nothing on this list tolerates soggy peat.
• 2Use a terracotta pot with a drainage hole. The porous clay wicks moisture and buys forgiveness for over-watering errors.
• 3Water by the soak-and-dry method: drench thoroughly when the soil is fully dry to the bottom of the pot, then leave it alone until it is fully dry again.
• 4Give as much direct light as the plant tolerates — most of these want more than a living-room windowsill provides in a Nordic winter. Etiolation (stretching and paling) is the most common symptom of insufficient light; see why are my plants' leaves turning yellow for the colour signals.
• 5Ease off in winter. Most succulents want roughly half their summer watering, cooler temperatures (10–15 °C is ideal for many), and no fertiliser between November and March. The winter regime in winter houseplant care — Nordic apartment guide applies almost unchanged.