|1||15C+||Indoor||Grow as a houseplant or under heated glass.|
|2||10 to 15C+||Indoor / Outdoor||Grow indoors, or outdoors in summer in a sheltered spot|
|3||5 to 10C||Tender||Grow outdoors in summer, and in a heated glasshouse in winter.|
|4||1 to 5C||Tender||Grow outdoors or under glass without risk of frost.|
|5||-5 to 1C||Half-Hardy||Hardy in coastal/mild/sheltered areas. Will not tolerate hard/sudden frost. May require winter protection in situ. such as fleece or straw mulch.|
|6||-10 to -5C||Hardy||May suffer at altitude, central/northerly locations, harsh winters, cold gardens and when grown in pots.|
|7||-15 to -10C+||Hardy||Will survive most severe winters but may be at risk in central/northerly locations and in pots. Top growth may be destroyed but will usually re-grow.|
|8||-20 to -15C||Hardy||Will survive severe winter, but may need protection when grown in pots.|
|9||-20C & Colder||Very Hardy / Hardy||in the severest European climates.|
Originating from SW USA, New Mex
Slow-growing, evergreen shrub usually with a single crown of leaves, a small trunk may form as the plant ages. Blue-green, sword-shaped leaves, tipped with a sharp point and edged with small threads. Spikes of creamy-white, bell-shaped flowers sometimes shaded purple-red are borne above the foliage in summer and may be followed by edible, banana-shaped fruit.
Grow in well-drained soil in full sun.
Height and spread after 4 – 5 years 50cm x 50cm
Semi mature height and spread after 10 – 11 years 1m x 60cm
Potential height and spread after 20 – 25 years 1.6m x 1.5m, width is dependent on flowering and subsequent branching.
|Height after 10 years|
|Season of interest|