Actual size and flowering may vary slightly based on season.
Silver Anniversary Yucca
Silver Anniversary yucca is a compact yucca with dusty, powder-blue leaves that arch out from a low clump. It stays about 2 to 4 feet tall and spreads 3 to 4 feet as it adds pups, so it fits borders, small beds and large pots. In early summer it sends up tall burgundy stalks hung with creamy white bells. It likes sun, needs little water once rooted and is rated to about -10°F.
Best for: blue color in borders and small beds, low accents in gravel, and large patio containers.
It stays about 2 to 4 feet tall, with arching powder-blue leaves. Line a border or a small bed with a few plants set about 3 to 4 feet apart.
Its compact size makes it a good accent for a large patio container. Use a fast-draining mix so the roots never sit wet.
In early summer it sends up stalks about 6 to 7 feet tall. They start burgundy and open into hanging, creamy white bells.
Soggy or poorly drained soil leads to rot, the main way to lose a yucca. The leaves are flexible but pointed, so give it a little room from paths and seating.
- Closer group3 ft apart
- Border or group3-4 ft apart
Keep the root area slightly damp until a new plant roots in, then stretch the time between waterings. Once rooted, soak it deeply about every 2 to 4 weeks in summer, less in spring and fall, and little or none in winter. Let the soil dry between soakings.
Plant it at the same depth it grew and keep the same side facing south. Shade a new plant with shade cloth until new growth shows, and skip the fertilizer, since it does not need any.
Old leaves fold down into a shaggy skirt, and removing them is optional. Cut each spent flower stalk low after it finishes. It blooms again in later years.
Snout weevils are the pest to watch for on yuccas. Leaves wilt or lean, the base goes soft, and the plant collapses. Good drainage and little water once rooted keep it healthy. Remove a collapsed plant and the soil around it so grubs do not spread.
It is rated to about -10°F. Keep the soil on the dry side in winter, since wet, cool soil leads to rot.
Drainage test first. Dig the hole and fill it with water. If water is still sitting in the hole a day later, you likely hit caliche, clay or hard soil, so fix the drainage before planting. If it drains very fast, the soil is sandy. Standing water around roots is a common reason new plants fail.
Weed cloth. Cut it away from the planting hole and where the roots will spread. Remove any plastic sheeting completely, since it keeps water and air out of the soil.
Rock or decomposed granite with no soil underneath. Bring in soil close in texture to your native soil, mix it with the soil below, and build up enough depth for roots before planting.
If you can break through. Use a breaker bar, pick, or jackhammer. Dig through the caliche and break out the solid chunks. Backfill with the soil you dug out, with no compost or manure in the hole. Confirm drainage before planting.
If you cannot break through. Dig narrow holes through the hard layer beside the root ball, not under it, and refill them with the same soil, not gravel. If it still will not drain, plant on a low mound of the same soil.
Root ball. Check the outside edges for any roots circling around. Loosen or cut those so they grow outward. Do not break up the center of the root ball.
Depth. The top of the root ball should sit at or just slightly above the surrounding soil level. Planting too deep can lead to rot and kill the plant.
Drip emitters. At planting, put the emitters on the root ball, on different sides of the plant. After about 2 months, move them to the outer edge of the root ball. Over the first year, add emitters farther out toward the edge of the branches as roots grow. Once a plant is rooted, never water only at the trunk.
How big does Silver Anniversary yucca get?
About 2 to 4 feet tall and 3 to 4 feet wide. It forms a clump of rosettes and keeps adding pups.
What color are the leaves?
The leaves are a dusty, powder blue. They are flexible, arching and sword-shaped with pointed tips.
What is Silver Anniversary yucca a cross of?
It is a cross of Adam's needle and pale leaf yucca, introduced in 2018.
When does it bloom?
It blooms in early summer. Flower stalks about 6 to 7 feet tall come up burgundy and open into hanging, creamy white bells. It does not die after blooming, so just cut the spent stalk low once it fades.
Does it need full sun?
It grows in sun to part sun, so a spot with some afternoon shade works too.
How often should I water it?
Water more often until it roots in. After that it needs little water. Soak it deeply and let the soil dry between waterings, with little or none in winter.
Is Silver Anniversary yucca cold hardy?
Yes. It is rated hardy to about -10°F, far colder than a Valley winter, so it needs no frost protection.
Can I grow it in a pot?
Yes. Its compact size suits a large patio container. Fill the pot with a fast-draining cactus mix.
What soil does it need?
It needs well-drained soil and should never sit in soggy ground. If you hit caliche, dig through it so the hole drains.
Is it toxic to pets?
Yucca is listed as toxic to dogs, cats and horses. In dogs and cats, chewing it usually causes vomiting. The pointed tips can also poke a pet.
Silver Anniversary Yucca for sale in Arizona, delivered to you
Silver Anniversary is a newer garden yucca, a cross of Adam's needle and pale leaf yucca. It forms a low, powder-blue clump that fills in with pups and sends up burgundy flower stalks. Below are the questions Valley homeowners ask most about it.
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A compact blue yucca for Phoenix yards
Silver Anniversary stays about 2 to 4 feet tall and 3 to 4 feet wide. Its dusty blue leaves make it a low accent for borders, gravel beds and pots.
Silver Anniversary yucca flowers
In early summer it sends up stalks about 6 to 7 feet tall. The stems are burgundy and the bell-shaped flowers are creamy white.
How far apart to plant Silver Anniversary yucca
Set plants about 3 to 4 feet apart, the width of a mature clump. They fill in as they add pups.
Watering Silver Anniversary yucca
Water more often until it roots in, then soak deeply and let the soil dry between waterings. It needs little water once rooted. Wet, poorly drained soil causes rot.
What Silver Anniversary is a cross of
It is a cross of Adam's needle and pale leaf yucca, first offered in 2018. It keeps a compact size and adds pups readily.
Silver Anniversary yucca in containers
Its compact size makes it a good choice for a large patio pot. A fast-draining mix keeps the roots healthy.
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