Common Name: Adam’s Needle ‘Ivory Tower’
Family: Asparagaceae
Plant Type: Evergreen Perennial (Rosette-forming)
Hardiness Zones: 4–10
Height: 3.0 to 4.0 feet (foliage), 5.0 to 6.0 feet (with flower stalk)
Spread: 2.0 to 3.0 feet
Bloom Time: Late June to July
Bloom Description: Tall spikes of creamy white, bell-shaped flowers
Sun Exposure: Full sun
Water Needs: Low
Soil Preference: Sandy or well-drained soils; drought-tolerant
Management Level: Low
Suggested Use: Xeriscape, specimen, architectural accent
Attracts: Moths, bees
Tolerates: Drought, heat, poor soils, salt, deer
Notable Features: Evergreen foliage, bold vertical flower stalk, highly drought-resistant
Nebraska Growing Notes:
‘Ivory Tower’ is a tough and dependable ornamental yucca cultivar that thrives in Nebraska’s sunny, dry environments. Its sword-like, blue-green foliage forms a dense rosette, while tall, dramatic flower spikes emerge in early to midsummer bearing dozens of creamy-white, nodding blooms. It performs well in sandy, rocky, or poor soils where other perennials struggle.
Ideal for xeric beds, prairie-style gardens, or as a bold specimen in low-maintenance landscapes. Evergreen leaves provide winter structure and year-round interest.
Landscape Use:
Excellent for drought-tolerant borders, rock gardens, slope stabilization, or modern landscapes needing bold texture. Use as a focal point in native-adapted plantings or in combination with grasses and other tough perennials.
Caution:
Foliage has sharp tips and fibrous edges, plant away from high-traffic areas. Avoid overly moist or compacted soils which can lead to root rot. Deadheading is optional but can be done after flowering to tidy the plant.
Garden Locations: