Does it need a lot of water?

No, it is highly drought tolerant once established and prefers dry soil.

Can I grow it in a pot?

Yes, it does well in large containers with excellent drainage.

Plant guide

Spanish dagger.

Yucca gloriosa

Pronounced YUK-uh glor-ee-OH-suh

Also known as Adam's Leedle, Adam's needle, Roman candle, Sea Islands yucca, Spanish Dagger, Spanish bayonet, Spanish-dagger, glorious yucca

moundlily yucca — Photo by Francesco Santoro (CC BY) via iNaturalist

The Spanish dagger is a striking, architectural shrub that brings a bold look to any garden. It features stiff, sword shaped leaves that form a dense rosette. You will love how it produces tall, impressive spikes of creamy white flowers.

Another photo of Spanish dagger — Photo by Patrick Le Mao (CC0) via gbif

At a glance

Care level: Easy
Plant type: Evergreen shrub
Light: Full sun
Indoor light: Direct sun
Water: Every 14 to 21 days
Mature size: 8 feet tall
Growth rate: Slow
Hardiness: USDA 7 to 10
Bloom time: Late summer to early autumn

Care

Plant this beauty in well draining soil to prevent root rot. Keep an eye out for yellowing leaves, which often signal that the soil is staying too wet. It is quite drought tolerant once established, so you do not need to fuss over it much.

Watering: Allow the soil to dry out completely between waterings.
Feeding: Apply a balanced fertilizer during the active growing season.
Pruning: Remove spent flower stalks and dead leaves in late autumn.
Repotting: Repot only when the plant becomes root bound in its container.
Soil: Sandy, well draining soil
Soil pH: 6.0 to 7.5
Temperature: -15 to 35°C
Humidity: 20 to 50%
Drought tolerance: High
Lifespan: Perennial, typically 10 to 20 years.
Fragrance: Light
Deer and rabbits: High

Signs it needs repotting

Roots growing out of the drainage holes
Plant becoming top-heavy
Stunted growth over several seasons

Safety

People: All parts of the plant contain saponins which are toxic if ingested and can cause skin irritation.
Pets: This plant is toxic to cats and dogs if ingested due to saponins.
Children: The extremely sharp, needle-like tips on the leaves pose a significant puncture risk to small children.
Contact allergens: The sharp, pointed leaf tips can cause puncture wounds and the sap may irritate sensitive skin.
Airborne allergens: The pollen can be a minor irritant for those with severe seasonal allergies.
Edibility: The plant is not considered edible and contains saponins that cause severe gastric distress.

How to identify it

Stiff, sword shaped evergreen leaves
Sharp, pointed leaf tips
Dense, upright rosette growth habit
Tall spikes of bell shaped flowers

Height: 1.5 to 2.5m
Spread: 1 to 1.8m
Leaves: blue-green, dark green, evergreen
Flowers: creamy white, greenish white, 5 to 8cm
Fruit: brown, Autumn

Problems to watch for

Root rot · Occurs when the soil remains too wet for extended periods.
Yucca moth · Usually beneficial but can cause minor damage to developing fruit.

By symptom

Plant problems by symptom

Check your spanish dagger from a photo

Pocket Botanist looks at a photo of your plant and tells you what's wrong and what to try first.

Growing it

Propagation: division, cuttings, seed
When to plant: spring, early autumn
Overwintering: Keep the soil dry during the winter months to prevent rot. If you live in a very cold area, you can wrap the crown with burlap to protect it from extreme frost.
In containers: It grows very well in pots, but ensure you use a heavy container to prevent it from tipping over as it grows.

Division

1. Carefully dig up the offsets or pups growing around the base of the main plant.
2. Use a sharp, clean knife to separate the pup from the parent.
3. Let the cut end dry for a few days to callous over.
4. Plant in a pot with well-draining cactus mix.

Group this plant with other drought-tolerant species to ensure you do not accidentally overwater it.

Grows well with

Lavender · They share a love for dry, sunny conditions and well-drained soil.
Sedum · These succulents provide a nice textural contrast while requiring similar care.
Blue Fescue · The blue foliage of the grass complements the color of the yucca leaves.

Similar species

Adam's Needle · It has similar foliage but is generally smaller and more cold hardy.
Spanish Dagger · It grows into a taller, tree-like form with even sharper leaves.

Science

Family: Asparagaceae
Genus: Yucca
Order: Asparagales
Class: Liliopsida
Native range: Southeastern United States coastal regions.
Conservation: It is considered threatened in some parts of its native range due to habitat loss.

It thrives in sandy, well-drained soils and is adapted to survive in harsh, windy coastal environments.

Value to wildlife: nectar source
Pollinators: moths
Uses: architectural accent, coastal landscaping, xeriscaping

Through the year

JFMAMJJASOND

Flowering

Fruiting

Foliage

Ecological indicators

Salinity: 7/9
Soil reaction: 6/9
Light: 8/9
Temperature: 7/9
Moisture: 2/9
Nutrients: 3/9

Taxonomy resolved against GBIF.

Questions people ask

Does it need a lot of water?: No, it is highly drought tolerant once established and prefers dry soil.
Can I grow it in a pot?: Yes, it does well in large containers with excellent drainage.

Where the name comes from

The name gloriosa refers to the glorious, large spikes of white flowers it produces. Yucca is a name derived from the Taino word for the cassava plant, though they are not related.

Good to know

It is often called the mound lily because of its growth habit.
The leaves are very stiff and end in a sharp spine.
It is remarkably tolerant of salt spray, making it perfect for beach gardens.
The flowers are edible if prepared correctly, but the rest of the plant is not.

Also in

Keep your spanish dagger growing

This page is a general guide. Save your plant in Pocket Botanist and you get care reminders timed for this plant, plus a care history that shows what worked.

Get the app

This guide was generated with AI on October 27, 2026 and checked against GBIF taxonomy. It is general information, not horticultural or veterinary advice. Read about how we build these guides.