I trimmed an overgrown California Lilac hedge today - April 21, 2010. It was a fairly warm day on central Vancouver Island - over 60 degrees fahrenheit and sunny but had been quite rainy over the last week. The hedge was about 7 feet high by 4 feet wide by 20 feet long. I used a gas powered trimmer and squared up the sides, top, and edges. The hedge is now 6 1/2 feet high by 3 feet wide by 20 feet long. My question is this: Will the hedge suffer any damage by being cut back at this time of year?