Thujas, also known as arborvitae, can be pruned to help shape and maintain their size. Here are some general tips for pruning thujas:

1. Timing: The best time to prune thujas is in late winter or early spring, before new growth starts. Avoid pruning in the fall, as this can encourage new growth that may not have time to harden off before winter.

2. Tools: Use sharp, clean pruning shears or loppers to make clean cuts. Avoid using dull or dirty tools, as this can damage the plant and increase the risk of disease.

3. Technique: To encourage thick growth, prune the top of the tree lightly, and focus on pruning the sides to create a conical shape. Avoid cutting into the woody part of the plant, as this can lead to bare spots and uneven growth.

4. Maintenance: Once you have achieved the desired shape, continue to prune the plant regularly to maintain its size and shape. Aim to remove only small amounts of growth at a time, rather than large chunks, to avoid shocking the plant.

It's worth noting that not all thujas need to be pruned. If your thujas are growing well and don't require shaping, you may not need to prune them at all. However, if you do decide to prune, following these tips should help you achieve the desired results.

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