Can anyone say that the more you spend on fert the better it is? I've used the cheap stuff to the high end crap and really don't see any difference. I want to buy product for the spring that's most beneficial for my clients without wasting their money and making me look like I know what the hell I'm doin. All are irrigated regularly but the results are lacking. Gone through high dollar Fertilome, Scotts and the like down to K-Grow. Someone said that Scotts puts their products under several different labels. Any truth to that?