Q.We Have Ornamental Grasses. They Are Spreading Into Each Other And Quite Tall. They Are Bound On One Side With Metal Edging And Pa
vers on the other. They have a drip system among them. We don’t want to divide because of the drip system. Will the boundaries k eep them in place? Will they go under pavers and cause damage or be contained? Thank you!

Certified GKH Gardening Expert
The boundaries should keep them in place for a few years. You can cut them back in late winter to reduce some of the excess growth. If they continue to grow without being divided they will start to die out in the center.
Here is more:
https://www.gardeningknowhow.com/ornamental/foliage/ornamental-grass/pruning-ornamental-grasses.htm
https://www.gardeningknowhow.com/ornamental/foliage/ornamental-grass

