When purchasing plants from a design drafted by someone else, it is always good to put on your reading glasses.
Two wonderful women with a real design knack gifted a design for the landscaping of the sign for our church's new community center building. When we (I won't embarrass my fellow gardener but her last name is a synonym for boast) went to the nursery to purchase the plants, we both read penstemon. We couldn't find the cultivar named and couldn't picture how a penstemon would look in the design.
Then we put on our reading glasses and saw it was a pennisetum. We found this beautiful plant and even though it wasn't the named cultivar, we decided it would be just the thing. As we were planting it, we noticed it was an annual and not hardy in our zone. I ended up with it in a smallish planter by my sidewalk. It is magnificent! I want to try to overwinter it inside but a large praying mantis has been in it for about a month and I suspect has laid eggs on it.
Oh, and my fellow gardener and I are both Advanced Master Gardeners with close to 100 years of gardening experience between us.