Our Lord's candle

Sun

Full sun.

Water

Low once established; water young plants occasionally during prolonged dry spells. Keep especially dry in winter.

Soil

Lean, sharply drained sandy or gravelly soil. Avoid heavy clay, winter waterlogging and rich, moisture-retentive compost.

Height

Foliage 2-3 ft (0.6-0.9 m); flowering spike 6-12 ft (1.8-3.7 m).

Spread

3-5 ft (0.9-1.5 m) per rosette; offsetting forms can spread wider.

Flowers

Late spring to early summer; a tall, densely branched spike of creamy-white, bell-shaped flowers, sometimes flushed purple.

Foliage

Evergreen. Stiff, narrow, silver-blue to grey-green leaves with finely toothed edges and very sharp terminal spines.

Growth

Slow; the flower stalk grows rapidly once flowering begins.

Care needed

Low

• Pollinators
• Deer resistant
• Drought tolerant
• Heat tolerant
• Low allergen

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

Difficulty

Hard

Toughness

Fairly tough

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

1. Planting day

   0.8 ft (0.25 m)

2. After 1 year

   1.1 ft (0.33 m)

3. After 2 years

   1.4 ft (0.42 m)

4. After 3 years

   1.6 ft (0.5 m)

5. After 5 years

   2.2 ft (0.67 m)

About 6 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

Mildly toxic: may upset a stomach

Native to

the US

Growth rate

Moderate

• Plant on a raised mound or slope where rain drains away quickly.
• Water deeply but infrequently during establishment, letting the soil dry between waterings.
• Avoid routine feeding; rich feeding is unnecessary.
• Use gravel mulch and keep it clear of the crown.
• Leave room around the sharp leaves, well away from paths, play areas and pets.
• In cool, wet climates, use a container that can be moved under a bright, rain-sheltered cover for winter.

Pruning. Remove completely dead outer leaves in spring with long-handled tools, wearing stout gloves and eye protection. After flowering, cut down the spent stalk and remove the dying rosette once it loosens, preserving any healthy offsets.

Spring

Plant once the soil is warming, choosing full sun and excellent drainage.

Spring

Remove dead leaves and check that mulch or fallen debris has not collected in the crown.

Late spring

Watch mature rosettes for an emerging flower stalk and keep access clear around it.

Summer

Water recently planted specimens during extended drought; leave established plants mostly dry.

Late summer

Remove spent flower stalks unless you are retaining developing seed capsules.

Autumn

Clear drainage outlets and move containers out of persistent winter rain in cool climates.

• Use as a solitary focal point in a gravel garden, with open ground around the rosette.
• Combine with low drought-tolerant plants so its upright leaves remain clearly visible.
• Plant on a sunny, dry bank among boulders for a California chaparral effect.
• Use in a large, freely draining container beside modern architecture, away from circulation routes.

Garden styles it suits: California native, Desert / xeriscape, Desert modern, Architectural minimal, Dry gravel garden and Modern Mediterranean.

Plant it with: California buckwheat, White sage, Cleveland sage, Deer grass, California fuchsia and Rockrose.

Wildlife: In its native range, flowers are pollinated by a specialist yucca moth whose larvae eat some developing seeds. Reliable seed production is unlikely where that moth is absent.

• Crown or root rot in wet soil: improve drainage, reduce watering and keep water from collecting in the crown; badly rotted plants rarely recover.
• Cold and winter-wet damage: choose a sheltered, sharply drained site or grow in a movable container where winters are cold and rainy.
• Scale insects or mealybugs: inspect leaf bases and remove small infestations by hand; use a labelled treatment if they persist.
• Rosette dies after flowering: this is normal, not a disease; retain healthy offsets if present, otherwise replace the plant or raise seedlings.

Species-specific toxicity to people, cats, dogs and horses is not well established, so it should not be treated as safe to eat. Related yuccas contain saponins that can cause digestive upset if swallowed. The sharp leaf tips and toothed edges are a clear puncture and cut hazard.

• Beaked yucca (Yucca rostrata)

  Develops a conspicuous woody trunk topped by a rounded head of narrow leaves; Our Lord's candle normally remains a ground-level rosette.

• Banana yucca (Yucca baccata)

  Has much broader leaves, often with curling edge threads, and a shorter flower cluster followed by large, fleshy fruits.

• Desert spoon (Dasylirion wheeleri)

  Has conspicuous hooked teeth along its leaves and a narrow stalk of tiny flowers rather than large, hanging, bell-shaped blooms.

Hesperoyucca means western yucca, whipplei honours American surveyor Amiel Weeks Whipple, and Our Lord's candle refers to the tall, pale flower spike.

Propagation. Sow seed in a warm, freely draining medium, keeping it lightly moist rather than wet. Where offsets form, separate well-rooted ones in spring with protective gloves; not every form produces offsets.

Accepted botanical name

Hesperoyucca whipplei

In the US and Canada

Native in the lower 48 states.

Native range

California and Mexico Northwest.

Measured

Soil pH 6.4 to 8.5. Average height 242 cm.

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