So I'm aware, but not the homeowner, that otto's should be thinned out with hand pruners. Basically selective thinning cuts after they bloom and they will look good. Well, I was asked to "clean up the appearance" of the ottos that line the foundation. By looking, I would say they are around 6-7 years old and might have been pruned a few times but nothing recently. I'm thinking the only way to really get them looking cleaned up and not so wild is to use the gas trimmers. Unfortunately this will tear the big leaves of the ottos leaving them looking rough. My question is for anyone that has done this, how fast will they grow back and kind of grow back out of the torn appearance? I've heard of late winter/early spring renovation for otto's where you cut about 1 foot lower than the target height. But I don't think the homeowner wants anything that drastic.