How to Prune Evergreen Trees and Shrubs

Evergreen pruning requires a different set of rules than deciduous tree pruning. Most conifers and many broadleaf evergreens share a critical characteristic that has no equivalent in deciduous species: they will not produce new growth from old bare wood. Cut a branch back past the point where foliage exists on that branch, and the resulting stub will not generate new shoots. It will simply remain as a dead stub, or die back further. Understanding this boundary is the most important principle in evergreen pruning.

The late-spring timing window and the foliage boundary rule together define almost everything you need to know about pruning conifers correctly.

The Old-Wood Rule

On most conifers, including pine, spruce, fir, and arborvitae, new buds form only in zones where current-season foliage is present. Prune a branch back to a point that carries foliage and the buds at the foliage base will develop into new growth. Prune past the foliage zone into bare wood and nothing develops. This makes over-cutting on evergreens essentially irreversible in most cases.

The practical implication is that evergreen pruning for size control is more constrained than on deciduous species. You can maintain a conifer’s size by trimming new growth each year but you cannot reduce a mature conifer to a fraction of its current size without creating large permanent bald zones.

Arborvitae is a partial exception among the common landscape conifers: it can regenerate from heavier pruning into older wood than most other species, though the response is slower and less reliable the further back into old wood the cut is made. The how to trim arborvitae guide covers the specific rules for this species.

When to Prune Conifers

The optimal timing for most conifers is late spring, after the current season’s new growth has extended but before it has fully hardened. At this point the new shoots are still flexible and the cut point heals into the developing growth efficiently.

Avoid pruning conifers during very hot, dry summer conditions. Pruning during heat stress increases moisture loss from the cut surfaces and reduces the plant’s ability to close wounds before cooler conditions return.

Light deadwood removal can be done at any time of year without the same timing constraints as shaping work.

Pine: Candle Pruning

Pine trees produce their new growth in a single annual flush called candles, which emerge in late spring and elongate over three to six weeks before hardening. Pinching or cutting candles before they fully elongate, at approximately half their final length, produces denser growth and reduces the annual extension rate without cutting into old wood.

To candle-prune a pine, simply pinch each candle back by about one-third to one-half of its current length with your fingers. No tool is necessary for soft candles. This technique works best as an annual practice starting when the tree is young: it is ineffective once the tree has become large.

Spruce, Fir, and Hemlock: Selective Tip Pruning

On spruce, fir, and hemlock, selective tip pruning of the current season’s new growth maintains size and encourages denser branching. Cut or pinch back the soft new growth at branch tips after it has extended in spring. Each pruned tip will develop two or more new buds the following season, gradually increasing branch density.

For major size correction on these species, the constraint is the same: work only within the current-season and one-year-old wood, where foliage still exists on the branch. Going further back creates bare zones.

Juniper: Light Annual Maintenance

Junipers are slightly more tolerant of heavier pruning than other conifers because their foliage density extends further back along the branches. However, the old-wood rule still applies: cutting back to fully bare interior wood produces dead sections. Prune junipers with bypass pruners or hand shears, working just behind the current growth to tighten the silhouette rather than reducing it significantly.

For specific guidance on arborvitae, which shares the landscape space with junipers and requires a similar approach with slight differences, see the how to trim arborvitae guide.