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advantage All-Aged Stand appearance areas arrived assure future crop Balsam fir growing base basis benefit better quality bottom whorl bush butt carried Christmas trees clump of trees compete condition culturing damage danger decide density depends develop effort enabled farm woodlot feet foot Future Crop Trees gained greater greatest ground growth harvest heavily height class individual industry instantly later least leaving lower maintained manage Nova Scotia number of trees obtained otherwise permit portion practice prefer province pruning purpose realized reason reduction regenerating Removing result retained rotation age scar seed germination seedlings seen shade shaped sometimes spaced species stem stocking strip assigned stump sufficient take place taken tallest theoretical annual cut thinning operation tion treatment tree is cut trees per acre trunk underpruning usually variable weed well-shap whorl of branches whorl of limbs width