Quick Fire Hydrangeas DISCONTINUED

What dos discontinued mean?

I bought (2) 3 gallon Quick Fire’s and need a 3rd to line my fence because they grow tall and don’t need as much sun as Limelight’s and other larger panicles.

My local nursery sells them out as fast as they can get them so I keep missing them, I’m afraid I won’t get my hands on another one.

If I have to propagate, how long will it take til it catches up and blends size wise with the others?