Evergreen Trees: 8 Types and How to Choose

Evergreen trees keep live foliage from one season to the next, and they shed their oldest leaves on a schedule instead of all at once. Penn State Extension puts the working life of one leaf or needle at one to six years, depending on the species, and about three years covers most of what you will plant in your yard. Fresh growth stacks on top of the old growth every spring, so your tree never goes bare.

That schedule looks different from tree to tree. A Colorado spruce carries several years of needles at once, so the drop happens deep inside the canopy where you never see it. An American arborvitae browns whole branchlets and lets them go in autumn, which looks alarming and is not. Needle retention is what keeps conifers green all winter. Broadleaf evergreens such as holly and rhododendron do the same work with wide leaves, and they drop their oldest leaves in spring as new growth pushes out. Both groups give you year-round foliage on different clocks.

Your soil decides more than the label does. Most evergreens want a pH of 5.0 to 5.5 or 6.0 to 6.5, and they want drainage that never leaves the roots sitting in water. Your feeder roots stay up in the top 6 to 18 inches (15 to 46 cm) of soil, so a spot that puddles after rain works against your tree no matter how good it looked at the nursery. Pick for drainage, water need and mature size, and the word on the tag stops mattering.

You probably came here after spotting yellow needles deep inside a tree you thought was dying. Old interior needles that yellow from top to bottom while the tips stay green are doing the normal thing. New growth that yellows or browns is the real warning, and that one points to insects, disease or a site problem you can still fix.

Sort the types of evergreen trees by mature size and water need before you sort them by looks. The table below gives mature height, mature spread and hardiness zone for 8 common choices. Read the spread column first, because width is what pushes a tree into your siding or your neighbor's fence.

A shared zone number tells you less than it looks. Colorado blue spruce and American arborvitae both hold at Zone 3, so winter cold will not decide between them. Size will. The spruce runs 90 to 100 feet (27 to 30 m) tall, more than twice the arborvitae, and eastern white pine lands in the middle at 50 to 60 feet (15 to 18 m).

Water need splits this list in half. Colorado State University Extension puts spruce and fir in the thirsty group, which is why they suit an irrigated lawn, while pines and junipers do better on drier ground. The same source found that native evergreens beat trees brought in from far away on similar sites. A species already growing wild near you starts ahead.

Try it on a real spot. Say the only open ground you have is a narrow strip between the drive and the fence. Run down the spread column and the wide trees rule themselves out, because Norway spruce and Canada hemlock at 25 to 30 feet (8 to 9 m) are never going to sit there. American arborvitae at 10 to 15 feet (3 to 5 m) and American holly at 6 to 10 feet (1.8 to 3 m) stay in. That cuts 8 trees down to 2 before you look at a single photo.

The inside of the white pine by my driveway went yellow one October while the branch tips stayed green. That row sits right outside the kitchen window, so I watched the color creep along it for about three weeks. Nothing was wrong with the trees. Eastern white pine carries three years of needles in summer and two in winter, and it sheds the oldest set every autumn. That is why white pine needle drop shows up as a yellow core under green tips.

The same habit runs through the whole group. Penn State Extension puts evergreen needle lifespan at one to six years by species, and about three years covers most of what people plant in a yard. Bristlecone pine sits at the far end and can hold the same needles for more than 16 years, a figure Bert Cregg, a horticulture professor at Michigan State, gives for that tree. Needle retention pays off in nutrients. Evergreens often grow in cold, poor soils, so holding old needles holds on to the minerals those needles worked hard to take up.

Seasonal needle drop always lands on the oldest needles inside the plant, spread through the canopy instead of stuck in one patch. Arborvitae browning works the same way, though the old foliage turns brown rather than yellow and whole small branchlets come off together. Color on this season's new growth is the part that should worry you. That points to mites, needle miners or spray damage. No treatment stops the normal shed, so water deeply before the ground freezes and let the tree get on with it.

Is my evergreen dying? Almost always, no. Utah State University Extension gives the test that settles it, and you can run it in one look. Normal needle drop is distributed through the interior of the plant, on the old needles packed close to the trunk, and the tips stay green. Yellowing evergreen needles deep inside a spruce in September are the tree doing what it is built to do.

Old needles yellow uniformly, top to bottom, while the newest tip growth holds its color the whole time. Flip that pattern and the reading changes. When this season's growth yellows or browns, the cause is insects or disease, not the calendar. That one check separates a tidy annual shed from real evergreen tree problems.

The abnormal causes make a short list. Spider mites on spruce leave stippled, dull needles and fine webbing, and needle miners hollow out spruce and arborvitae foliage from the inside. Aphids cause severe yellowing of new white pine needles. Herbicide injury from a lawn spray or a drifting weed killer twists and discolors the new growth. Two more causes involve no pest at all, and they catch more homeowners than any bug. Winter drought under a house eave dries needles the roots cannot resupply, and wet or poorly drained soil starves them from the other direction.

Winter burn is the one that fools people. Evergreens turning brown on the side facing wind or road glare, after a hard freeze, lost water the roots could not pull from frozen ground. A deep soak before the soil freezes each fall limits it. Nothing you spray in July will.

Pine, spruce and fir all read as one green blur from the driveway, and that is where most people give up. Evergreen tree identification gets easy the moment you close the last 10 feet (3 m) and put a hand on a twig. The needles settle it long before the cones do. You need about 30 seconds and one bare branch.

The difference between spruce fir and pine starts with how each needle joins the wood. Pines gather theirs into needle bundles of two, three or five, held at the base by a thin papery sheath, and spruce and fir set every needle on the twig alone. Bundles mean pine. Single needles send you to the next check.

Cone orientation covers you when the needles leave room for doubt. Pine cones hang down off the branch and fir cones stand upright on top of it, like candles set on a shelf. Look at a few cones still on the tree rather than one off the ground, because a loose cone tells you nothing about where it grew.

Pine tree identification ends with counting. Penn State Extension puts Eastern white pine at five needles per cluster, each one 3 to 5 inches (8 to 13 cm) long, with cones up to 6 inches (15 cm). Count the bundle, hold a needle against your finger for length, and you walk away with far more than the genus.

Match the ground to the tree before you fall for the tag. Penn State Extension sets soil pH for evergreens at 5.0 to 5.5 for most of them, or 6.0 to 6.5 for the ones that want only a slightly acidic bed. Rhododendron sits at the sour end. Japanese yew, spruce and fir sit at the mild end, and a cheap soil test tells you which half of that range your yard already lives in.

Soil on the high side of the scale brings a different problem. Iron chlorosis shows up often in high-pH ground, and it hits some evergreens harder than others. A tree can stand in soil full of iron and still go short of it. If your test reads well above neutral, pick a species that copes instead of fighting the whole yard.

Two spruce on a clay-heavy lot I planted were brown to the trunk inside 18 months. Both holes held water like buckets after every rain, and both root flares sat 2 inches (5 cm) below grade. Poor drainage and the wrong planting depth are among the most common killers of needled evergreens. Dig wide and shallow on clay, set the flare at or a little above grade, and never add sand alone to that clay. Sand by itself makes heavy soil worse.

Evergreen watering gets easier once you know the roots that matter sit close to the surface. Most feeding roots sit in the top 6 to 18 inches (15 to 46 cm) of soil. Most garden areas do best on 1 inch (2.5 cm) of water a week when rain does not supply it. Water long and slow so the whole layer soaks. Every needled evergreen here wants well-drained soil more than it wants rich soil, so group spruce and fir where you can water them and give pines and junipers the drier corner.

Cold water numbed my fingers through the glove, and the soil under the pine gave off that flat mineral smell it gets in October. That was the eighth autumn since the pine went in. I still give it a slow soak before the ground locks up. That autumn drink limits winter drying injury, because frozen roots cannot pull up water to replace what the wind strips from the needles.

Most evergreen tree care lands in a few narrow windows instead of spreading evenly across your year. Iowa State Extension points out that roots keep growing until the ground freezes, so your newly planted tree needs water through dry spells right up to that point. Seasonal needle drop runs on its own clock. Pines and other needle-leaved evergreens shed their oldest needles in late summer or early autumn. Yew drops in the late spring or early summer of its third year. Holly and other broadleaf evergreens let go of their oldest leaves in spring as new growth pushes out.

Winter burn shows on the windward side of your tree first. Needle tips turn brown and brittle while the sheltered side stays green. Most winter injury happens when the plant and the soil are both frozen, and roots locked in ice cannot replace the water that wind pulls out of the foliage. Your winter watering, then, is really an autumn job. One deep soaking before freeze-up does more than anything you try once the ground is hard.

The rest of evergreen maintenance is mostly watching. Yellow needles down the inside of your pine in September are normal, and no spray or fertilizer changes them. Brown on this year's new growth is a different signal, and it points you toward mites, needle miners or root trouble. Check the calendar above against what your tree is doing before you reach for a treatment.

Your first moves happen before you buy anything. After the next hard rain, walk the spot you have in mind and watch how long water sits on the surface. Then test the soil. Most evergreen trees want acid ground near pH 5.0 to 5.5 or 6.0 to 6.5, and iron deficiency is common on high-pH ground, worse in some evergreen species than in others. Check the mature spread on the tag against the space you have, and mark it out on the ground before you dig.

Group by water needs when you plant. Spruce and fir take the extra water and do well set in a lawn, while pines and junipers hold up better on dry ground, so keep those two crowds apart. Iowa State Extension puts most feeding roots in the upper 6 to 18 inches (15 to 46 cm) of soil, which is where your water has to land. The same source gives a garden baseline of about 1 inch (2.5 cm) of water a week when rain does not supply it. Treat that as a starting point for a garden area, not a measured dose for a spruce.

Late summer and autumn bring the interior shed. Old needles deep inside the canopy turn yellow and fall while the tips stay green, and that is the tree doing its job. Roots keep growing until the ground freezes, so in a dry autumn soak the root zone before it does. That one soaking is the most useful piece of evergreen tree care you get all winter.

One caveat outranks the rest. Ground that stays wet for hours after rain is the wrong place for a needled evergreen, however cold hardy the tag says it is. Poor drainage and planting too deeply are among the most common killers of these trees. Choosing evergreens works when you start with drainage, water need and mature size, because the word on the tag tells you almost nothing.