Nutrition and Fertilization

Tree Nutrient Requirements:

Trees must extract 13 nutrients from the soil in order to survive.


  • Nitrogen
  • Phosphorus
  • Potassium
  • Magnesium
  • Sulphur
  • Calcium


  • Iron
  • Manganese
  • Zinc
  • Molybdenum
  • Copper
  • Chlorine
  • Boron

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These are the thirteen elements that every tree needs. It must have all of them. There are no substitutes. A tree deficient in any one element will not be healthy and will die well before its time.

Tree Docotor Fertilizing:

  • Complete fertilizer – all 13 needed soil elements
  • Deep-root injection – aerates soil thus providing superior access to oxygen for roots; also deposits fertilizer below turfgrass roots so that tree gets all of it
  • Organic – attracts micro-organisms, improves soil as well
  • Suspension – not readily soluble in water – will not leach into ground water – will not wash away
  • Variable & slow release – makes nutrients available on a continuous basis for 12 months
  • Low salt – will not “burn” roots
  • Usually applied in early spring or early fall
  • Mixed at our shop to provide optimum combination of elements for season, plant species and plant needs

Benefits of Fertilizing

  • Alleviate compact soil
  • Increase tree tolerance to drought
  • Enhance plant resistance to insect and disease attacks
  • Reduce wind and storm damage (by thickening cell walls)
  • Produce more dense leaf canopy