If you are trying to work out which yucca you own, start with two questions: does the leaf end in a sharp spine, and was it sold as a houseplant or a garden plant? Those two answers narrow the nine species below to one or two candidates. Identity matters, because the indoor yucca and the garden yuccas differ in cold tolerance by up to six hardiness zones.

NC State places the yuccas it profiles in the asparagus family (Asparagaceae). Every species in this guide that NC State profiles is flagged as a problem for dogs, cats and horses.

The nine yucca species at a glance

Sizes are mature outdoor sizes from NC State Extension profiles. Containers keep plants much smaller.

SpeciesCommon namesNative rangeMature size outdoorsLeaf tipUSDA zonesBest use
Yucca gigantea (syn. Y. elephantipes)Spineless yucca, giant yucca, soft-tip yuccaCentral Mexico to Central America4.6–9.1 m tall (15–30 ft)Soft, no spine10–12Houseplant; outdoors only in frost-free climates
Yucca filamentosaAdam’s needle, curlyleaf yuccaSoutheastern USA0.9–2.4 m (3–8 ft)Pointed, with thread-like filaments on the margins4–10Garden; cold-hardy clumps
Yucca flaccidaWeakleaf yucca, floppy yucca, Adam’s needleEastern North AmericaLow rosettes that sucker into coloniesSofter, lax leaves4–9Garden; dry, sandy or rocky ground
Yucca glaucaSoapweed yucca, Great Plains yuccaGreat Plains, Canada to TexasLow rosettesNarrow, pointed4–8Garden; dry, cold climates
Yucca gloriosaMound lily yucca, Spanish daggerCoastal southeastern USA1.8–4.9 m (6–16 ft)Sharp7–11Garden or large container
Yucca gloriosa var. tristis (syn. Y. recurvifolia)Curve-leaf yucca, weeping yuccaSoutheastern USA1.2–1.8 m tall (4–6 ft)Pliable, curved back7–10Garden and interior landscapes
Yucca aloifoliaSpanish bayonet, dagger plantCoastal plain, Virginia to Texas3–4.6 m (10–15 ft)Very sharp, stiff6–11Barrier planting, coastal gardens
Yucca rostrataBeaked yucca, silver yuccaSouthwestern Texas, northern Mexico1.5–4.6 m (5–15 ft)Soft, blue-green5–12Garden specimen; xeric beds
Yucca brevifoliaJoshua treeMojave DesertMost top out around 12 m (40 ft)StiffNot a garden plantWild desert species

The indoor yucca: Yucca gigantea

The yucca in garden centres’ houseplant aisles is Yucca gigantea. NC State notes it was formerly known as Yucca elephantipes, a name that refers to its thick, elephant-foot trunk, so most plant labels still use it. Unlike other yuccas, its leaves do not end in sharp spines.

Outdoors in a frost-free climate it can reach 4.6–9.1 m (15–30 ft). As a container plant it stays much more compact. It is hardy only in USDA zones 10 to 12, and NC State advises bringing it indoors when temperatures drop below 10 °C (50 °F).

What it needs indoors:

  • Light: NC State lists full sun to part shade. Indoors, that means your brightest window. A plant in a dim corner stretches and its new leaves come in narrow and pale.
  • Drainage: NC State recommends one part potting mix to three parts perlite or sand for container plants. It is drought tolerant, and overwatering is the main way to lose it.
  • Temperature: Keep it away from cold drafts and sudden temperature swings. Cold and freezing temperatures cause damage and dieback.

Two cultivars are listed. ‘Variegata’ has soft-tipped, flexible, pale green leaves with broad cream stripes. ‘Marginata’ has a narrow cream stripe on both leaf edges.

Check before you water: a trunk that gives under gentle pressure at the soil line points to rot in a wet root zone. Firm trunk and dry mix means the plant can take water.

Garden yuccas for cold climates

Yucca filamentosa (Adam’s needle)

This is the yucca most often sold for gardens in colder regions. It forms clumps 0.9–2.4 m (3–8 ft) tall and is listed for zones 4 to 10. Look for curly, thread-like filaments peeling from the leaf margins; that is the quickest identification check. NC State lists it as resistant to deer, rabbits, drought, heat and salt spray. It can be propagated by division, root cuttings or seed.

Variegated cultivars include ‘Bright Edge’ (gold leaf edges), ‘Color Guard’ (gold centre stripe), ‘Garland Gold’ and ‘Golden Sword’.

Yucca flaccida (weakleaf yucca)

Its leaves are softer and bend over rather than standing rigid. It suckers to form small colonies and grows best in poor, dry, sandy loam or rocky soil. Zones 4 to 9. Cultivars include ‘Golden Sword’, ‘Gold Heart’, ‘Ivory’ and the blue-green ‘Blue Sentry’.

Yucca glauca (soapweed yucca)

NC State describes it as among the most cold-hardy and landscape-ready yuccas. It needs sharp drainage and full sun and cannot survive waterlogged soil. It is native to short-grass prairies from Canada to Texas. Zones 4 to 8.

Coastal and southern yuccas

Yucca gloriosa (mound lily yucca)

A coastal species from North Carolina to Florida that tolerates heat, humidity, drought and salt spray. It starts as a basal rosette and eventually forms a woody trunk up to 4.9 m (16 ft). NC State notes it is often grown as a container plant and can be grown indoors, which makes it the most practical second choice for a bright conservatory.

Yucca gloriosa var. tristis (curve-leaf yucca)

Still sold as Yucca recurvifolia. Its pliable, leathery leaves curve backward, and NC State recommends it as a safer replacement for Spanish bayonet where people walk past. It reaches 1.2–1.8 m (4–6 ft) and is used in interior as well as exterior landscapes.

Yucca aloifolia (Spanish bayonet)

The stiffest and most dangerous leaves in this list: NC State calls the leaf-tip spines very sharp. It grows 3–4.6 m (10–15 ft) on sandy, well-drained soil and tolerates salt spray. In shade, the leaves come in small and soft and the plant rarely blooms. Plant it as a barrier, not beside a path or a play area.

Tree-form yuccas

Yucca rostrata (beaked yucca)

A trunk-forming yucca with a symmetrical crown of pale blue-green leaves. NC State calls it one of the hardiest trunk-forming yuccas, tolerating cold to zone 5, and notes its leaves are softer than most. It is slow-growing and wants well-drained sandy soil and at least half a day of full sun. ‘Sapphire Skies’ has a more silvery leaf and grows to about 1.5 m (5 ft).

Yucca brevifolia (Joshua tree)

The Joshua tree is a wild species of the Mojave Desert. The National Park Service notes most plants top out around 12 m (40 ft), grow roughly 1.3–7.6 cm (½–3 in) a year once established, and first flower at about 50 to 70 years of age. It is not a garden or houseplant choice. We include it because many people searching “types of yucca” are trying to identify it.

How to identify your yucca in three checks

  1. Feel the leaf tip carefully. A soft tip on an indoor plant points to Y. gigantea. A hard spine means a garden species.
  2. Look at the leaf edge. Curling white threads point to Y. filamentosa. Smooth edges with a backward curve point to Y. gloriosa var. tristis.
  3. Look for a trunk. A thick trunk indoors is almost always Y. gigantea. A trunk with a crown of blue-green leaves in a garden suggests Y. rostrata.

If the label is missing and the plant is indoors, treat it as Y. gigantea until a flower or a botanical label proves otherwise.

Pets and safety

NC State flags every species in this guide that it profiles as a problem for dogs, cats and horses. The toxic principle is saponins. Its Y. gigantea profile lists vomiting in dogs and cats, and nausea, vomiting and diarrhea in humans if ingested. Place sharp-tipped species where nobody, including pets and children, brushes past at eye level.

For light placement across other houseplants, see our houseplant light requirements guide.

Updated October 14, 2026: rebuilt as a species comparison from NC State Extension and National Park Service data. Earlier unsupported outcome figures remain removed.

References