I saw a guy in my area utilizing a deep root feeder to fertilize hibiscus, palms, and trees today. Is this an efficient way to fert. plants? Here in the desert, we have drip systems and almost no rain. Because of this you cannot just broadcast granulated fert in the beds. It will be there 10 years later.....I have been wanting to add something on to my business and am wondering if this is the way to go. Any body? The LCO's around here do not fert the plants due to the difficulty of it so I could very easily keep my same contacts and add more. I can think of lots of neat ways to piggyback my sprinkler business with this new endeavor but......anyone?