Q.Why Are My Dahlia Flowers Turning Brown On The Bottom
My dahlias are blooming; however, one of the plants have flowers which turn brown on the bottom after a day or two. I have 2 other plants growing right beside then and neither have the browning issue.

Certified GKH Gardening Expert
Unfortunately, your photo did not come through. I am unable to determine what is causing your issue.
Brown, usually, indicates fungal or bacterial infection. You may want to use a fungicide to kill or prevent any microbial issues. This article will help:
https://www.gardeningknowhow.com/garden-how-to/info/using-fungicides-in-garden.htm
https://www.gardeningknowhow.com/ornamental/bulbs/dahlia/dahlia-care-grow-dahlia-plant.htm