I’ve never had a rock garden, I confess, but a book about a modern and extreme form of the art caught my attention when it was published. It’s called “The Crevice Garden: How to Make the Perfect Home for Plants from Rocky Places,” and its authors joined me in a conversation about why you might want to make room for one, and the plants it can support.

Colorado-based Kenton Seth and Paul Spriggs from British Columbia are garden designers with a particular specialty in rock gardens.

When the pair appeared on the popular Garden Masterclass webinar series, British host Noel Kingsbury said this in his way of introducing them: “Rock gardening will no longer elicit a yawn because this is the future.

Kenton and Paul and I did a “New York Times” garden column together a few years ago, and I wanted to learn more, so I asked them to give us a peek into this brave new world.

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