Whoa... Dude.. Don't do it. I tried it years ago and killed some top quality plants. See, with straight sugar, you will amp up the little microorganisms in the soil - which, if they are good ones - is great. However, if you have more (not so nice) microorganisms present, they will get all amped up and steal energy from your plant roots.
If you want to stay organic, but still boost growth - Use Blue Mountain Organics " Super Plant Tonic " it has molasses in it, but with mychorrizal fungi (they are the good guys - who feed your roots, increase resistance to drought, and generally toughen up you plants). Straight sugar is unpredictable. Super Plant Tonic is made by a bunch of Hippies living in the Ozark Mountains.. Word has it - They supply a Famous... Country Singer.....who is partial to the Bud... I believe his intials are WN.
You can find it on Ebay for about 10 bucks.. Just search Organic Fertilizer or Organic Plant Tonic.. If you find it, buy it quick, it goes fast...