Sapphire Skies Blue Beaked Yucca. Zone 5b to 10b selected the most powder blue form for tissue culture under the name, Yucca rostrata ‘Sapphire Skies’. Yucca rostrata is one of the hardiest species of trunked yucca, forming a 4′ tall, deer-resistant, hummingbird-friendly plant in 10 years. The narrow, powder blue leaves are quite flexible

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