Dyna-grow â€˜Growâ€™ is an an excellent choice for fertilizing trees in containers. Dynagrow provides complete nutrition with all 6 macronutrients as well as 10 micronutrients. A liquid fertilizer providing all that is needed for your trees. The lower nitrogen to phosphorus ratio promotes slow steady growth and strong roots. Lower soluble salts reduce the salt build up so common from liquid fertilizer and a problem particularly for maples. We use Dyna-grow â€˜Growâ€™ on all of our young trees here at the nursery at a rate of 1/2 teaspoon per gallon 1 time per week.