Soapweed yucca

Yucca glauca

Family:: Asparagaceae
Elevation:: 4,000 ft – 8,000 ft
Bloom:: May – Jul
Region:: Southwest

A low rosette of narrow blue-green blades that throws a tall spike of creamy bell flowers in early summer, pollinated exclusively by the yucca moth. Common on grassland and mesa across NM.

Care · tuned to the Southwest

Water

None once established. Rot is the only real threat, always from too much water.

Sun & exposure

Full sun.

Soil

Lean, sandy or rocky, fast-draining. Thrives on caliche.

In the Southwest

The single stalk of the state flower belongs to a yucca like this. Depends on the yucca moth to set seed, so it's a keystone for that relationship. Wear gloves — leaf tips are needle-sharp.

Common problems & fixes

Yucca plant bug — sap-feeding bugs stipple and yellow-speckle the leaves
Fix — Treat with insecticidal soap and clear debris that harbors them.
Aphids on bloom stalks — cluster on flowering stalks in spring
Fix — Rinse off with water or apply insecticidal soap to the stalk.
Crown and root rot — overwatering or heavy clay rots the crown
Fix — Plant in sandy, fast-draining soil and avoid supplemental water once established.

Pets & toxicity

Contains saponins; ingesting the foliage can cause vomiting/drooling in dogs and cats. The sharp tips are the more common injury.

Easy to confuse with

Banana yucca (Yucca baccata) — broader leaves, fleshy fruit
Sotol (Dasylirion) — toothed leaf margins, not smooth

Sources

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