This small, streaky hosta is as close to slug-proof as any in my garden, though it did get nibbled a bit when I was away in July for two weeks. I've had it long enough to consider it mature. Please feel free to post your own pictures of this hosta.
June 21
Aug. 13 - by comparison, note the slug damage on the mini-hostas surrounding 'Rainbow's End'.
Sept. 28 - it holds up well late in the season.
