I think the only difference is the speed at which the plant grows....we grew some that were fed 24/7. But we grew ours in a water solution only no rocks or anything else so if the water was off the roots would dry up in no time. I'm trying to find the pics I have, but we had a 300' x 56' greenhouse growing tomatoes and red fire lettuce with a few weed plants mixed in. With the tomato plants growing to about 8-9 feet tall it covered the weed plants pretty good.