How-to Guide
How to Prune Pines and Spruces
The short answer
Pines grow differently from most trees: new growth comes only from terminal buds called candles, and pines do not form lateral buds along the stem, so they will not resprout from old bare wood. That single fact governs how you prune them.
To shape a pine, work with the candles. In spring, pinch or cut the soft, elongating candles back by up to a half to two-thirds while they are still green; never cut back into the older, needled or bare wood, because no new shoot will replace what you removed.
Spruces and firs are different: they do form buds along their shoots, so pruning a shoot back to a bud stimulates new growth there and you have more latitude. For both groups, prune in late winter to spring as new growth begins, and remove any dead or damaged branches anytime.
Candling: the core concept for pines
In spring, a pine pushes out fingerlike 'candles', the pale, soft new shoots, before the new needles expand. Michigan State University Extension explains that in pines, shoots grow rapidly in spring and complete a large portion of shoot extension before needle expansion begins, and that pines form a whorl of buds at the terminal end of each shoot rather than lateral buds along the stem. That whorl at the tip is the only place next year's growth can originate.
So you control a pine's size and density by candling: while the candle is still soft and green, pinch or cut it back, removing up to half to two-thirds of its length to force a denser, more compact whorl of buds. MSU notes candles may be pruned with hand pruners or a shearing knife, and new shoot growth can be controlled simply by pinching off at the desired height. Pinching by hand is often gentler than shears on species like mugo pine, because shears slicing through the emerging needles can leave brown tips.
Never cut a pine into old wood
This is the rule that trips people up. Because a pine cannot form new buds along its bare, older wood, cutting a branch back into that leafless zone leaves a permanent stub that will not resprout, creating a dead-looking gap that never fills in. MSU underscores the stakes: if the terminal buds on a shoot are lost, to pruning, browsing, or pest damage, the shoot will not be able to produce a normal whorl of branches the next year.
The practical consequences are two. First, you cannot shorten an overgrown pine by cutting it back into old wood the way you might a shrub; if a pine is too big for its space, that is largely permanent. Second, do all your shaping on the current year's green candles, in season, and never leave it so late that you are cutting hardened shoots. Plan a pine's placement for its mature size, because candling manages growth but cannot truly reduce an established tree.
Spruces and firs are different, and timing
Not all conifers share the pine's limitation. MSU notes that single-needled conifers such as spruces, firs, and Douglas-fir do form lateral buds along the stem, so pruning the terminal stimulates additional bud development along the shoot. That means with a spruce or fir you can cut a shoot back to a healthy bud or small side branch and expect new growth there, giving you more flexibility to shape or reduce than a pine allows, though you still cannot expect resprouting from very old, bare interior wood.
On timing, prune both pines and spruces in late winter to spring around the flush of new growth: candle pines as the candles elongate and are still soft, and shape spruces and firs in late winter before growth starts or as the new shoots emerge. Dead, broken, or diseased branches can be removed at any time of year. For general shade-tree cuts and the branch-collar rule that still applies to larger conifer limbs, see the mature-tree pruning guide.
Sources
Reviewed 2026-07-18. We cite university Extension, government, and established horticultural sources — and never invent pesticide rates or dangerous treatments.
- Michigan State University Extension - Pruning Pines — In pines, shoots grow rapidly in spring and complete a large portion of shoot extension before needle expansion; pines form a whorl of buds at the terminal end of each shoot and do not form lateral buds along the stem; candles may be pruned with hand pruners or a shearing knife and new shoot growth controlled by pinching at the desired height; if terminal buds are lost the shoot cannot produce a normal whorl of branches the next year; single-needled conifers such as spruces, firs and Douglas-fir form lateral buds, so pruning the terminal stimulates additional bud development along the stem.