I have plants in the ground outside in northern California. I am using Roots Organics Buddha Grow(2.0 - 0.25 - 1.5) and Extreme Serene(analysis says 0% for N and 2% for each of P and K) for foliage feeding. My plants are 5 1/2 ft tall and have a diameter of 4 - 5 ft. The packaging says for established mature plants to use up to 2 tbs per gallon. I get that. However, I feel like they need more than just one gallon of food at a time. So my bushes are going to turn into trees soon and I have no idea how much I should give them because I doubt that I could over fertilize one of the plants if I gave it the whole gallon of Buddha Grow. Please give me your opinions because I have no idea how much to give. Thanks in advance.