Agave “Black Widow” is an A. schidigera hybrid, or maybe it’s a selection. Not only are the green leaves striped, but the marginal threads are silver. Now that’s a nice feature. It’s a moderate sized agave, getting 2 feet across. It’s also a fairly hardy agave withstanding temperatures into the low 20s. So you might be able to grow it where you are. Unless you live in Minnesota and then don’t try this at home.
Our plants are finally get big enough, mature enough, to really show off those silver threads and the symmetrical leaf growth and the variegated leaves. Sweet mercy those are pretty plants.