Spineless yucca

Sun

Full sun to partial shade outdoors; bright light indoors. Acclimatise indoor plants gradually before moving them into direct summer sun.

Water

Water young plants regularly while they establish, allowing the soil surface to dry between waterings. Established plants tolerate drought; container plants need watering once the upper few inches of compost have dried. Keep much drier in winter.

Soil

Freely draining sandy, gravelly or loamy soil. Avoid waterlogged clay and use a free-draining potting mix in containers.

Height

15-30 ft (4.6-9.1 m) outdoors; usually 4-8 ft (1.2-2.4 m) in containers

Spread

8-15 ft (2.4-4.6 m) outdoors; usually 2-4 ft (0.6-1.2 m) in containers

Flowers

Mature outdoor plants may produce upright clusters of creamy-white, bell-shaped flowers in summer or early autumn. Flowering is uncommon indoors.

Foliage

Evergreen. Long, strap-shaped green leaves form dense rosettes at the ends of branches; older leaves droop before drying against the trunk.

Growth

Moderate in warm conditions; slow in cool climates or restricted containers.

Care needed

Low

• Drought tolerant
• Heat tolerant
• Low allergen

Northern hemisphere months. In Australia, shift them by six.

Difficulty

Moderate

Toughness

Fairly tough

Pick your zone, country, light and whether you have pets.

1. Planting day

   7 ft (2 m)

2. After 1 year

   7 ft (2.2 m)

3. After 2 years

   8 ft (2.4 m)

4. After 3 years

   8 ft (2.6 m)

5. After 5 years

   10 ft (2.9 m)

About 26 years to full size.

From a typical nursery size, at an average rate for this kind of plant. A rule of thumb, not a forecast.

Cats and dogs

Toxic

Growth rate

Slow

• Plant where water drains away quickly, with the trunk base at its original soil level.
• Water deeply during establishment, then allow the soil to dry between waterings.
• Feed container plants lightly with a balanced liquid fertiliser during spring and summer; established garden plants rarely need feeding.
• Use pots with drainage holes and empty saucers after watering.
• Move containers under cover before frost; keep them bright, cool and relatively dry through winter.

Pruning. In spring or early summer, remove dead lower leaves and cut spent flower stalks near their base. To reduce height, cut a trunk or branch to the desired level during warm growing weather; healthy plants usually produce new shoots below the cut.

Spring

Check drainage, remove dead leaves and repot container plants only if roots have filled the pot.

Late spring

Move overwintered containers outdoors after frost risk has passed, gradually increasing their sun exposure.

Early summer

Shorten overgrown stems if needed and use healthy cut sections for propagation.

Summer

Check container moisture regularly and feed lightly while plants are actively growing.

Autumn

Stop feeding and bring tender container plants under cover before frost.

Winter

Water sparingly and check sheltered plants for scale insects and mealybugs.

• Use as a branching focal point in a sunny, frost-free courtyard, leaving room for its mature canopy.
• Grow in a large, stable container to frame an entrance without crowding the walking route.
• Combine with agaves and low succulents in a gravel bed for contrasting leaf shapes.
• Plant with palms and bird of paradise for an evergreen, tropical-looking border.

Garden styles it suits: Architectural minimal, Contemporary minimal, Modern Mediterranean, Modern tropical, Dry gravel garden and Desert / xeriscape.

Plant it with: Foxtail agave, Aloe, Blue chalksticks, Bird of paradise, Dwarf bottlebrush and Lomandra.

Wildlife: Flowers can provide food for visiting insects, but successful pollination of yuccas normally depends on specialist yucca moths. Seed production is therefore uncommon where the appropriate pollinator is absent.

• Root or stem rot: soft trunks, yellowing leaves and sour-smelling compost usually indicate prolonged wetness. Reduce watering, improve drainage and take healthy stem cuttings if the base is rotting.
• Scale insects and mealybugs: inspect leaf bases and stems, remove small infestations by hand and use a labelled horticultural oil or insecticidal soap if needed.
• Frost damage: leaves may blacken or collapse after freezing. Move pots into shelter and wait until spring growth starts before cutting back damaged tissue.
• Leaf scorch: pale or brown patches can follow a sudden move from indoors into strong sun. Introduce direct sunlight gradually.

Toxic to cats, dogs and horses if eaten because it contains saponins. Chewed leaves and other plant parts can cause vomiting, diarrhoea and drooling; horses may develop more serious illness. Raw plant material can also cause stomach upset in people, and sap may irritate skin. Keep it away from pets that chew plants; leaf tips and edges can cause physical injury.

• Spanish bayonet (Yucca aloifolia)

  Has much stiffer, narrower leaves ending in a hard, sharp spine; spineless yucca has broader, more flexible leaves without that rigid terminal spine.

• Curve-leaf yucca (Yucca gloriosa var. tristis)

  Usually forms a shorter, clumping shrub with arching leaves that retain sharp terminal spines, rather than a large tree with thick branching trunks.

• Corn plant (Dracaena fragrans)

  Has softer, broader leaves with smoother edges, often with a yellow or pale central stripe; its cane stems lack the swollen, rough base typical of older spineless yuccas.

The species name gigantea means giant, referring to its large size, while spineless describes its lack of the hard terminal leaf spine found on many other yuccas.

Propagation. Take stem sections or detach rooted basal offsets in spring or summer. Allow cut surfaces to dry briefly, then place them in a freely draining propagation mix and keep warm and only lightly moist until rooted.

Accepted botanical name

Yucca gigantea

Native range

Belize, Costa Rica, Guatemala, Honduras, Mexico Central, Mexico Gulf, Mexico Southeast, Mexico Southwest, Nicaragua and Panamá.

Sources: GBIF (CC BY 4.0) and Trefle (CC BY 4.0). The care and design notes are LandscapeGPT's own.