Variegated Yucca
Yuccas are hardier than they appear, and only fail in cold exposed inland positions, where they are better grown as container plants.
The Variegated Yucca, Yucca glauca variegated, have stiff evergreen rosettes and are part of the scene in hot dry Central and North American scrublands.
Otherwise they are handsome architectural foliage plants for dry, sunny borders.
The remarkable flower-spikes, 6' or more high, appear when plants are five or more years old.
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For organic disease control, try the following: test your treatments, start early in the morning, don't apply treatments in windy or wet weather, treat only when the weather is cool, make sure you are covered up.
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