Q.I have lots of hostas of different varieties and this year one of them nearly tripled its size. Do hostas get bigger if planted
in an area where they have room to expand ? The blooms were huge and the pods are also huge; can plants be grown from the pods? Should they be cut back to the ground in the fall ?

Certified GKH Gardening Expert
Could you have planted the extra large variety? Some grow quite large and others don't. You don't need to cut them back, they will die back naturally in late fall. You can grow hosta easily from seed pods, but it may not grow true from seed, due to the many hybrids.
https://extension.uga.edu/publications/detail.html?number=C955&title=Growing%20Hostas
https://www.gardeningknowhow.com/ornamental/foliage/hosta/hostas-containers.htm
https://www.gardeningknowhow.com/ornamental/foliage/hosta/dividing-hosta-plants.htm