Would be good to have reference to scape strength when it comes to purchases. I suppose one could ask before purchasing.
When it to tall and strong, Judy Davison's plants are among the best I've ever purchased. Tall strong but not so thick that you get blasting of the scapes.
Of the Northwind series (for example) Northwind Larry is the best at keeping those tall scapes up. Had I consider this before purchasing I would have done a better job at selecting. Didn't realize that scapes laying on the ground would bother me so much. Northwind Dancer was removed this past fall. Were I to hybridize definitely would not be using a plant with weak scapes.
The same is true of some daylilies by Brain Mahieu and other hybridizers. Some keep their scapes up others lay on the ground.
What good is a back of the border plant if the scapes are lying on the ground where one can't see them.