Hosta 'Umi Oba'
 

This is a non-registered seedling of H. montana from Japan. It has green leaves with a yellowish green medial (center) variegation.

Mikiko Lockwood in an article on The Hosta Library titled, A Little About Japanese Hosta Terms defines the term oba or ooba as large leaf, 'Oba Giboshi' or H. montana.

 
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