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Hole spacing (inch) Amount per hole (ml) All Species 8 75 Except Maples 8 40 Oaks 4 40 Sycamore 4 150 Month Time (Min.) January 30 February 45 March 10 April 12 May 15 June 22 July 7 August 4 September 4 October 9 November 9 December 10 Species Minutes Catalpa 18.16 Black walnut 9.54 Hackberry 4.91 Mulberry 17.17 Black locust 27.43 Sugar maple 4.47 American elm 9.92 Red maple 12.02 Silver maple 4.47 White ash 28.23 Box-elder 5.75 Sycamore 4.49 Kentucky coffee tree 20.56 Black cherry 4.21 Norway maple 7.32 Crown class dbh Injection time % of trees 1 Small 6 18 1 2 8 11 17 3 14 12 64 4 23 13 16 5 Large 31 2 2 Time class % of trees Fast (0-10 min.) 69 Medium (11 -20 min.) 14 Slow (21 min. +) 17 100% All trees −59% Top trims −54% Side trims −64% Month % Change January + 11% February −50% March −62% April −25% May −68% June −60% July −30% Catalpa −78% Black walnut − 73% Hackberry −71% Mulberry −68% Black locust −66% Sugar maple −66% Elm −65% Red maple −65% Silver maple −64% White ash −63% Box-elder −63% Sycamore −60% Kentucky coffee tree −47% Black cherry −18% Norway maple −12% Year 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Average annual cost per tree Two year Trim 2 Yr. Cycle X X X X X X X $14.11 Trim 2 Yr. Cycle + 3 Yr. Regulate X X X X 10.43 Trim 2 Yr. Cycle + 4 Yr. Regulate X X X 9.13 Trim 2 Yr. Cycle + 1 -3 Yr. Regulate X R X R X 9.17 Trim 2 Yr. Cycle + 1-4 Yr. Regulate X R X X 8.11 Three year Trim 3 Yr. Cycle X X X X X X 11.48 Trim 3 Yrs. Growth + 3 Yrs. Regulation X X X X 9.13 Trim 3 Yrs. Growth + 4 Yrs. Regulation X X X 8.63 Trim 3 Yrs. Growth + 1-3 Yrs. Regulation X R X R 8.38 Trim 3 Yrs. Growth + 1 -4 Yrs. Regulation X R X R 7.79 Four year 4 Yr. Trim Cycle X X X X X 9.73 4 Yr. Trim Cycle + 3 Yrs. Regulation X X X 8.64 4 Yr. Trim Cycle + 4 Yrs. Regulation X X X 8.22 4 Yr. Trim Cycle + 1-3 Yrs. Regulation X R X R 7.69 4 Yr. Trim Cycle + 1 -4 Yrs. Regulatiòn X R X R 7.29
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