Q: Do you have any info that would help our HOA organize its response to its fountain grass infestation? Also, are there any fountain grass variations that local nurseries sell that are sterile and wonβt spread?
A:Β Fountaingrass (Pennisetum setaceum) is a fast growing, attractive, perennial, fire-adapted bunch grass and in our ideal environment can reach several feet tall and wide. It does just fine in dry environments although some rain helps. Unfortunately, it invades desert areas and readily outcompetes native species.
There are some varieties that are purported to be sterile but research shows theyβre not 100 percent sterile and thatβs a deal breaker considering it is invasive. Since it is a noxious weed in dry areas like ours I recommend removing it when possible, spraying with herbicides when necessary, and not planting it again. As is sometimes the case with invasive plants, humans are guilty of planting this species before we knew it was invasive. When it was first introduced, it was thought to be just another pretty grass for medians and landscapes.
Peter L. Warren is the urban horticulture agent for Pima County Cooperative Extension and the University of Arizona. Questions may be emailed toΒ tucsongardensage@gmail.com
