You have Button bush information. What does that mean when my Button bush starts having yellow leaves? Thank you!
Certified GKH Gardening Expert
Yellowing leaves generally indicate a watering issue. Either to much or to little.
Bottle Bush do need regular water so if it has been dry and with the summer heat it likely needs more water.
2 to 3 inches of hardwood mulch can help with moisture retention.
Here is a link to refresh you on the care requirements.