Ruellia Brittonia -- Mexican Petunia 3-4 ft. tall
I have ruellias planted in a u-shape around my patio. They are about 3 feet tall by 3 feet in width. Lately I have found some bare areas near the top and when I looked closely I found that there was a lot of horizontal growth that was choking off the vertical growth. I started cutting out this horizontal growth but there is an awful lot of it and I am afraid I will hurt the plant by doing so. What should I do?