How to grow Penstemon
Penstemon, How big does it get? Is it a perennial, what are the growing requirements?
Certified GKH Gardening Expert
They will not usually exceed 3 feet tall. They are perennials in warmer climates, but annuals in hot or cold climates. This article will help: https://www.gardeningknowhow.com/ornamental/flowers/penstemon/penstemon-beard-tongue.htm