| How 'bout Red Yucca, Hesperaloe parviflora... drought resistant, leaves up to 4 ft. long, flower spikes up to 8-9 ft... very nice... 
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Here is a link that might be useful: Red Yucca
| In addition to Hesperaloe parviflora, there is Hesperaloe funifera that looks a little more like a Yucca with wider, more upright leaves and a much taller bloom stalk. The link below describes it as 6'tall (the leaves) but I've never seen it taller than 4' in the Phx area. HTH 
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Here is a link that might be useful: H. funifera