cutting off the dead flowering part
What happens if you cut off the dead flowering part after flowers are done blooming? My bulb grew, stemmed up and flowered. They died. I pulled out dead flowers and then cut stem off because I saw the seed in there. They weren't brown and I didn't wait the 4 to 6 weeks.
I'm a little unclear of the type of flower your talking about, but generally deadheading perennials or flowering bulbs is perfectly acceptable.
Generally the greens are left on the plants until they die off to help feed the plant to store up energy for winter.
Most likely the plants you trimmed back will be just fine.