Q.My yard became overgrown with weeds so I had the lawn guy cut everything back including the greens of my gladiolus
Needless to say I did not get any flowers this season. Do I still need to thin out the bulbs in the Spring?

Certified GKH Gardening Expert
I don't believe the two events are related. You need to divide glads every three to four years in the fall to keep the bed in good shape. So, unless you've had them in the ground that long, or they had seemed overcrowded, there is no need to divide.
https://www.gardeningknowhow.com/ornamental/bulbs/gladiola/trimming-leaves-on-gladiolus.htm