Q.Sterile Foxgloves
I have a couple perennial foxgloves which are also sterile. What is the best way to propagate these please?

Certified GKH Gardening Expert
If they are sterile, then there will be no way to propagate them. Since Foxglove only live for 2, and sometimes 3 years they complete their life cycle fairly quickly.
The first year is vegetative, and the second is spent flowering and producing seed. If there is no seed, then you will need to source some new seeds for the next season.
Here is an article for more information on the care of Foxglove:
https://www.gardeningknowhow.com/ornamental/flowers/foxglove/foxglove-flowers.htm