Plants like sugar. You can also use molasses, or honey. Flora nectar will work great too.
I have never not used some form of carbs so I can't say I have noticed any difference. Not only will your plants like it but the beneficial life that kicks it down by the roots will be happy too.
Since you have grown without adding sugars why don't you start a thread of a grow exactly like one of your old ones and see the difference. It would make a great thread. :jointsmile: