. Christmas tree culture in natural stands of Douglas-fir in Montana. Christmas tree growing Montana; Douglas fir Montana; Forests and forestry Montana. â gicre 2.âTuo stumps were oultured to produce Christmas trees: left stump ' was treated to favor adventitious shoots; right stump was treated to favor a branch which were competing for space with the featured turnups and shoots, were removed. In addition, about half of the lower branches of the new turnups were pruned to reduce excessive height growth. A paired-tree design method was used: stiunps treated to favor branch turnups were
. Christmas tree culture in natural stands of Douglas-fir in Montana. Christmas tree growing Montana; Douglas fir Montana; Forests and forestry Montana. â gicre 2.âTuo stumps were oultured to produce Christmas trees: left stump ' was treated to favor adventitious shoots; right stump was treated to favor a branch which were competing for space with the featured turnups and shoots, were removed. In addition, about half of the lower branches of the new turnups were pruned to reduce excessive height growth. A paired-tree design method was used: stiunps treated to favor branch turnups were matched with those treated to favor adventitious shoots. This same pairing method was used in each of 4 successive years following the cutting of the original trees. In- cluded were 6 pairs of trees in each of 4 years at 5 locations--making a total of 120 pairs of trees. All treatments were randomly assigned. Basal Pruning Low-density crown, due to excessive distances between whorls, was felt to be responsible for reducing the quality of many trees. Five different basal pruning methods applied once at the start of this study were tested to determine if height growth, and as a result, distance between whorls could be reduced and if higher quality trees would result. The treatments were: 1. Remove lower two-thirds of the green crown 2. Remove lower one-half of the green crown 3. Remove one-half of the green crown from midtree, leaving lower branches for future stump culture (fig. 3) 4. Remove crown along two-thirds of one side of the green crown and strip off one inch or more of the bark 5. Shear buds from leaders and laterals A paired-tree design, with one of the pair randomly chosen for pruning and the other used as a check, was used to determine pruning effects (fig. 4). Six pairs of trees for each of the five treatments at five locations--a total of 150 pairs--comprised the sample. When treated, the trees averaged 12 feet in height, ranging from 10 feet on the plot near Eu
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