Silver Anniversary Yucca, Silver Anniversary Soapwort
Yucca ‘Silver Anniversary’, often sold as Silver Anniversary Yucca, is a bold evergreen hybrid grown for wide, powder-blue to dusty silver-blue sword-like leaves, vigorous offsetting growth, and towering creamy white flowers on burgundy-tinged stalks. Tough, architectural, and remarkably low-maintenance, it brings year-round structure to hot, dry borders, rock gardens, gravel gardens, modern landscapes, containers, slopes, and water-wise plantings.
This is a yucca with real presence. Its broad blue leaves form a strong, rounded rosette that becomes a widening cluster of crowns over time. In late spring to early summer, tall flower spikes rise dramatically above the foliage, opening to pendant white to cream-white bell-shaped blooms that add height, contrast, and pollinator appeal.
Garden spotlight: Silver Anniversary is the yucca to plant when you want powder-blue foliage, vigorous evergreen structure, creamy white flowers, drought tolerance, deer resistance, and bold architectural impact in a sunny, well-drained garden.
Summary: Vigorous evergreen hybrid yucca with powder-blue to dusty silver-blue sword-like foliage and tall creamy white bell-shaped flowers on burgundy-tinged stalks.
Use: Excellent for sunny borders, rock gardens, gravel gardens, xeriscapes, modern landscapes, containers, slopes, dry gardens, and coastal-style plantings.
Highlight: Wide blue leaves form a bold offsetting clump with strong year-round architecture.
Note: Best in full sun to part sun and sharply drained soil. Avoid wet, heavy, poorly drained sites, especially in winter.
| Botanical Name | Yucca ‘Silver Anniversary’, listed botanically as Yucca filamentosa x Yucca pallida ‘Silver Anniversary’ and protected as PP31,437 |
|---|---|
| Family | Asparagaceae |
| Common Names | Silver Anniversary Yucca, Silver Anniversary Adam’s Needle, Silver Anniversary Soapwort, Hybrid Yucca |
| Native Range | A cultivated United States hybrid selected from North American species, Yucca filamentosa and Yucca pallida |
| Plant Type and Habit | Evergreen succulent perennial; stemless rosette, vigorous offsetting clump, architectural habit |
| Hardiness | Generally hardy in USDA Zones 5-10; often listed as Zones 5b-10b |
| Height | About 24 in. tall in foliage; mature flower spikes may reach about 7 ft. in bloom |
| Spread | About 4 ft. wide as a mature offsetting clump |
| Spacing | 36-48 in. apart, or wider where the rosettes need room to develop and be viewed as specimens |
| Sun Exposure | Full sun to part sun; strongest color and flowering usually occur in bright sun |
| Soil | Average to lean, sandy, gravelly, rocky, or sharply drained soil |
| Water Needs | Low once established; water during establishment and during prolonged drought |
| Bloom Time | Late spring to early summer; burgundy flower stalks may emerge in mid-May in warm climates |
| Flower Color | Creamy white to white pendant bell-shaped flowers |
| Foliage Color | Powder blue, dusty blue, silver-blue, or glaucous blue-green foliage |
| Pollinator Value | Flowers attract pollinators; yuccas are famously associated with yucca moths |
| Deer Resistance | Generally deer and rabbit resistant due to rigid, fibrous, sword-like foliage |
| Best Uses | Specimen plant, borders, containers, rock gardens, gravel gardens, xeriscapes, slopes, dry gardens, coastal-style plantings, modern landscapes |
Yucca ‘Silver Anniversary’ is a vigorous hybrid yucca introduced by Plant Delights Nursery and Juniper Level Botanic Garden in 2018. It was selected from a cross involving two North American species, Yucca filamentosa and Yucca pallida. The result combines the powder-blue foliage associated with pale yucca and the greater vigor, hardiness, and offsetting strength of Adam’s Needle.
The plant is grown mainly for its striking evergreen foliage. Its broad, glaucous leaves form a tight rosette when young, then multiply into a bold cluster of crowns with age. In late spring to early summer, tall burgundy flower stalks rise above the clump and open into dramatic towers of creamy white, pendant, bell-shaped flowers.
Silver Anniversary is a cultivated hybrid, not a wild species. Its parents are North American yuccas adapted to sunny, open, well-drained habitats. That background explains why this plant performs so well in gravel gardens, hot borders, slopes, sandy soils, rock gardens, and dry landscapes. For ecological restoration, use locally appropriate native yucca species; for ornamental dry-garden structure, Silver Anniversary is an outstanding hybrid selection.
This yucca forms a stemless rosette at first, then produces multiple offsets in successive years. Mature clumps are commonly described as about 2 feet tall in foliage and about 4 feet wide. The flower display is much taller: mature spikes may reach about 7 feet, giving the plant a dramatic seasonal silhouette. Allow enough space for the clump to widen and for the flowers to rise without crowding nearby plants.
The flower stalks are one of the plant’s best features. They often emerge burgundy or reddish, creating strong contrast with the powder-blue foliage before the flowers open. The blooms are creamy white to white, pendant, and bell-shaped. They are showy, architectural, and attractive to pollinators. After flowering, remove spent stalks at the base to keep the clump tidy.
Design tip: Silver Anniversary is broader and more vigorous than many compact yuccas. Give it breathing room, gravel, stone, low grasses, or fine-textured perennials so the blue rosettes and tall flower spikes can dominate the scene.
The foliage is the main reason to grow Silver Anniversary. The leaves are broad, rigid, sword-like, and powder blue to dusty silver-blue. This cool foliage color looks especially strong beside pale gravel, dark mulch, burgundy stems, orange flowers, yellow daisies, and blue ornamental grasses. Because the plant is evergreen, it provides structure when many herbaceous perennials have disappeared.
In spring, the blue rosettes sharpen as new growth expands and flower stalks begin to rise. In late spring to early summer, burgundy stalks and cream-white flowers create a dramatic vertical display. In summer, the foliage holds its color through heat and dry spells. In fall and winter, the evergreen rosettes continue to provide form, color, and texture, especially against gravel, stone, snow, or dormant grasses.
Silver Anniversary is generally suitable for USDA Zones 5-10 and is often listed as hardy from Zone 5b to 10b. Like many hardy yuccas, it tolerates cold best where drainage is excellent. Winter wet is more dangerous than winter cold. In colder or wetter climates, plant it high, use a raised bed, amend heavy clay, or choose a slope where water moves away from the crown.
Yucca flowers can attract bees, butterflies, hummingbirds, and other beneficial insects. Yuccas are also famous for their relationship with yucca moths, one of the classic examples of plant-insect specialization. In ornamental gardens, Silver Anniversary contributes evergreen habitat structure, dramatic flowers, and low-water resilience.
Once established, Silver Anniversary is highly drought-tolerant. Water regularly during the first growing season to help roots establish, then reduce irrigation sharply. In the ground, established plants usually need water only during extended drought. In containers, water more often but always allow the mix to drain freely.
Silver Anniversary is generally resistant to deer and rabbits. The rigid, fibrous, sharply pointed foliage is not appealing to most browsers. No plant is completely deer-proof, but yuccas are among the more reliable choices for exposed, low-water landscapes.
Yucca may cause skin irritation or allergic reactions in sensitive people, so wear gloves, long sleeves, and eye protection when handling, pruning, or dividing Silver Anniversary. The sharp leaf tips can also cause physical injury, so avoid planting it close to narrow walkways, seating areas, play spaces, or high-traffic entries.
Yucca is also considered harmful to pets, including dogs and cats, if eaten. Keep pets from chewing the leaves, and contact a veterinarian if ingestion is suspected.
Silver Anniversary is a cultivated offsetting yucca and is not generally considered invasive in garden settings. It can, however, develop into a broad multi-crown clump over time. Remove unwanted offsets if needed, or allow them to develop for a bolder architectural mass.
Yuccas range from compact rosette-forming perennials to dramatic trunked species. Choose hardy rosette types such as Silver Anniversary for cold-winter gardens, containers, xeriscapes, and architectural borders. Choose trunked species only where climate, space, and winter drainage are suitable.
Explore Yucca – Compare yuccas by foliage color, mature size, hardiness, flower display, and best landscape use.
Choose Silver Anniversary when you want a vigorous blue-leaved yucca with broad foliage, fast offsetting growth, and very tall creamy white flowers. Choose more compact rosette types when garden space is limited.
Full sun gives the strongest foliage color, densest rosettes, and best flowering. Part sun is also tolerated, especially in hot climates, but too much shade may reduce flowering and make the clump less compact. Aim for at least 6 hours of direct sun daily where possible.
Plant in average to lean, sharply drained soil. Sandy, gravelly, rocky, and raised-bed soils are excellent. Heavy clay should be improved before planting, or the yucca should be planted high so the crown remains dry. In containers, use a gritty, fast-draining mix and a pot with drainage holes.
Water regularly during the first growing season. Once established, water deeply but infrequently during prolonged dry spells. Avoid frequent shallow irrigation and never keep the soil soggy. Yuccas store water in their tissues and are adapted to dry cycles.
Feed lightly, if at all. A small amount of compost or a light, slow-release fertilizer in spring is usually enough. Overfeeding is unnecessary and can encourage softer growth that is less resilient.
Gravel mulch is ideal because it suppresses weeds, reflects heat, and keeps the crown dry. If using organic mulch, apply it thinly and keep it away from the base of the rosette.
Care tip: Treat Silver Anniversary like a plant from a sunny, rocky slope. Give it light, drainage, and space, then avoid overwatering and overfeeding.
Silver Anniversary requires little maintenance once established. Remove spent flower stalks after bloom by cutting them close to the base. Trim dead, damaged, or weather-beaten leaves as needed, but avoid cutting into the central rosette. Wear gloves, long sleeves, and eye protection when working around yuccas because the leaf tips are sharp.
Do not shear the foliage. Its beauty comes from the natural symmetry of the blue rosettes. If offsets develop beyond the desired footprint, remove or divide them in spring.
Plant in spring after the soil begins to warm, or in early fall where winters are not severe. Space plants 36-48 inches apart. For specimen use, allow enough open ground around the clump so the rosettes can widen and the tall flower stalks can be appreciated.
In containers, use Silver Anniversary as a bold thriller in a large, stable pot. Because the clump can grow wide, avoid small or lightweight containers. Pair it with trailing thyme, sedum, blue fescue, silver foliage, or other dry-garden companions that prefer sharp drainage.
Propagate by removing offsets when they develop. Let cut surfaces dry briefly before replanting in well-drained soil. Named cultivars should be propagated vegetatively to maintain their distinctive powder-blue foliage, offsetting habit, vigor, and flower characteristics. Seed propagation may not produce plants identical to Silver Anniversary.
Yucca ‘Silver Anniversary’ is generally tough and low maintenance when grown in full sun to part sun and sharply drained soil, but several pests and diseases can occur, especially where plants are stressed, crowded, overwatered, or grown in humid conditions.
Thrips may feed on yucca foliage, causing pale streaking, silvery scarring, distorted growth, or dark specks of frass on the leaves. Improve plant vigor, avoid excessive nitrogen, and monitor new growth during warm weather.
Scale insects may appear on yucca leaves, especially near the leaf bases and protected crevices. Inspect plants regularly and treat early before colonies become established.
Mealybugs may gather in leaf bases, crowns, or other sheltered areas. Small infestations can be removed with a cotton swab dipped in alcohol, while larger infestations may need repeated treatment.
Agave and yucca weevils may occasionally attack yuccas, especially stressed plants or those grown in poorly drained, overly moist conditions. Adults can damage crowns and leaves, while larvae may tunnel into plant tissue, leading to decline or collapse. Prevention is important: grow Silver Anniversary in full sun to part sun, sharply drained soil, and avoid overwatering established plants.
Brown leaf spot, often associated with Coniothyrium concentricum, can cause brown, rounded, or zoned lesions on yucca leaves. Remove badly affected leaves, avoid overhead watering, and provide good airflow.
Gray leaf spot, associated with Cytosporina species, may cause grayish or tan lesions on foliage, especially in humid or crowded conditions. Reduce leaf wetness, improve spacing, and remove infected debris.
Fusarium stem rot, caused by Fusarium species, can lead to stem decay, crown decline, wilting, or collapse. Prevention is the best control: plant in sharply drained soil, avoid overwatering, and remove severely affected plants.
Southern blight, caused by Sclerotium, can attack the crown and lower stems, especially in warm, humid, wet conditions. Look for rapid decline, rotting tissue, and sometimes white fungal growth near the soil line. Improve drainage, keep mulch away from the crown, and remove infected plant debris.
Poor flowering is usually caused by too much shade, excessive moisture, young plant age, or stress from poor drainage. Give Silver Anniversary full sun to part sun, lean soil, excellent drainage, and time to mature.
Use Silver Anniversary wherever you need evergreen structure, powder-blue foliage, and strong drought-tolerant form. It is especially effective beside pale gravel, boulders, stone edging, silver foliage, blue grasses, lavender flowers, and orange coneflowers. The blue rosettes contrast beautifully with fine textures, rounded forms, and soft flowering perennials.
For a modern dry garden, combine it with Sedum ‘Autumn Joy’, catmint, salvia, yellow coreopsis, and Russian sage. For a bold architectural planting, repeat it with ornamental grasses, agaves in mild climates, hardy cacti where appropriate, and gravel mulch. For containers, pair it with trailing thyme, creeping sedum, and silver-leaved drought-tolerant plants.
Best look: Give Silver Anniversary room to mature. The wide blue clump and tall creamy white flower spikes look best against a simple ground plane of gravel, stone, and low companions.
Yucca ‘Silver Anniversary’ is an evergreen hybrid yucca selected from Yucca filamentosa and Yucca pallida. It is grown for powder-blue to dusty silver-blue sword-like foliage, vigorous offsetting growth, and tall creamy white flowers on burgundy-tinged stalks.
Yucca ‘Silver Anniversary’ usually grows about 24 inches tall in foliage and about 4 feet wide as a mature clump. Its flower spikes may reach about 7 feet tall in bloom, creating a dramatic seasonal display.
Full sun is best for the strongest foliage color, densest growth, and best flowering, but Yucca ‘Silver Anniversary’ also tolerates part sun. Too much shade may reduce flowering and make the clump less compact.
Yes. Once established, Yucca ‘Silver Anniversary’ is drought tolerant and suitable for xeriscapes, gravel gardens, dry borders, slopes, and low-water landscapes. Water regularly during the first season, then water only during extended dry spells.
Yucca ‘Silver Anniversary’ typically blooms in late spring to early summer. Burgundy or reddish flower stalks rise above the foliage and open to creamy white, pendant, bell-shaped flowers.
Yes. Yucca ‘Silver Anniversary’ can grow in large containers if the pot is stable, has drainage holes, and is filled with a gritty, fast-draining mix. Use it as a bold evergreen thriller with other drought-tolerant companions.
Yes. Yucca ‘Silver Anniversary’ is an evergreen succulent perennial. Its powder-blue sword-like foliage provides structure, color, and texture through winter in suitable climates.
Yucca ‘Silver Anniversary’ is generally deer and rabbit resistant because of its rigid, fibrous, sharply pointed foliage. No plant is completely deer proof, but yuccas are usually reliable in browsing-prone dry gardens.
Cut spent flower stalks at the base after bloom. Remove dead or damaged leaves carefully, but do not shear the rosettes. Wear gloves, long sleeves, and eye protection because yucca leaves have sharp tips.
Rot is usually caused by poor drainage, overwatering, or wet winter soil. Move the plant to a sunnier, drier, better-drained site, plant high, and avoid keeping moisture around the crown.
Updated: June 2026 • Reviewed by Gardenia Editors
| Hardiness |
5 - 10 |
|---|---|
| Plant Type | Cactus & Succulents, Perennials |
| Plant Family | Asparagaceae |
| Genus | Yucca |
| Common names | Yucca |
| Exposure | Full Sun, Partial Sun |
| Season of Interest | Spring (Early, Mid, Late), Summer (Early, Mid, Late), Fall, Winter |
| Height | 2' - 7' (60cm - 210cm) |
| Spread | 3' - 4' (90cm - 120cm) |
| Spacing | 36" - 48" (90cm - 120cm) |
| Maintenance | Low |
| Water Needs | Low, Average |
| Soil Type | Chalk, Loam, Sand |
| Soil pH | Acid, Alkaline, Neutral |
| Soil Drainage | Well-Drained |
| Characteristics | Showy, Evergreen |
| Tolerance | Drought, Deer, Salt, Rabbit, Dry Soil, Rocky Soil |
| Garden Uses | Beds And Borders, Patio And Containers |
| Garden Styles | City and Courtyard, Gravel and Rock Garden, Informal and Cottage, Mediterranean Garden |
| Hardiness |
5 - 10 |
|---|---|
| Plant Type | Cactus & Succulents, Perennials |
| Plant Family | Asparagaceae |
| Genus | Yucca |
| Common names | Yucca |
| Exposure | Full Sun, Partial Sun |
| Season of Interest | Spring (Early, Mid, Late), Summer (Early, Mid, Late), Fall, Winter |
| Height | 2' - 7' (60cm - 210cm) |
| Spread | 3' - 4' (90cm - 120cm) |
| Spacing | 36" - 48" (90cm - 120cm) |
| Maintenance | Low |
| Water Needs | Low, Average |
| Soil Type | Chalk, Loam, Sand |
| Soil pH | Acid, Alkaline, Neutral |
| Soil Drainage | Well-Drained |
| Characteristics | Showy, Evergreen |
| Tolerance | Drought, Deer, Salt, Rabbit, Dry Soil, Rocky Soil |
| Garden Uses | Beds And Borders, Patio And Containers |
| Garden Styles | City and Courtyard, Gravel and Rock Garden, Informal and Cottage, Mediterranean Garden |
How many Yucca ‘Silver Anniversary’ (Adam’s Needle) do I need for my garden?
| Plant | Quantity | |
|---|---|---|
| Yucca ‘Silver Anniversary’ (Adam’s Needle) | N/A | Buy Plants |
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