Put on gloves to protect your hands while pruning the Mugo pine.
Choose a time in the early spring of the year to trim Mugo pines. Avoid trimming or pruning in the fall and winter. Select a time to prune in early spring before the sap in the tree begins to rise.
Hold a candle or new elongated growth at the end of the branch with your hand.
Place the blades of a bypass pruner around the new candle growth. Position the blade so that the upper 2/3 of the candle will be removed.
Clip the candle growth from the branch with a smooth motion to eliminate any tearing. Continue to the next branch and cut the candle growth in the same manner.