Serviceberry

Site and soil

Serviceberry grows naturally along woodland edges and in the understory, so it is comfortable in partial sun. NC State Extension notes that Allegheny serviceberry flowers best in part sun to part shade and tolerates shade. Penn State and Iowa State Extension both point out that the more direct sun it receives, the heavier the flowering and the fruit crop, and the brighter the fall color. Pick a spot with at least a few hours of direct sun if berries are the goal.

Our stock is listed for sandy, loamy or rocky soil, and Iowa State Extension singles out Allegheny serviceberry for tolerating drier, rocky ground. It is happiest in a moist, well-drained, slightly acidic loam, as NC State describes, and University of Minnesota Extension gives a preferred pH of 5.5 to 7.0 while noting it tolerates higher. What it does not like is heavy, wet, poorly drained soil. Penn State Extension warns that heavy clay can lead to root rot, so on clay sites plant on a slight rise or mound rather than in a low spot.

Mature size and spacing

Plan for a mature tree 15 to 25 feet tall and 15 to 20 feet wide. A single specimen wants its full spread to itself. Our 6 to 8 foot spacing is for a hedge, screen or grove row where the crowns are meant to knit together into one mass; give specimen trees more room than that. Wisconsin Horticulture Extension notes that serviceberries cast only light shade and their roots are not invasive, so shade-tolerant perennials can be planted right underneath.

Pollination and years to fruit

Serviceberry is self-fertile. Penn State Extension describes it as self-fruitful, meaning flowers can be pollinated by blossoms on the same tree, so a lone tree will bear. A second serviceberry within bee range improves the set and gives a heavier crop. Expect the first worthwhile harvest in about 3 to 5 years; Utah State University Extension notes that new plants bear lightly for the first couple of years, usually begin fruiting at 3 to 5 years, and reach full production around year 8.

Neighbors to keep at a distance

Serviceberry is in the rose family, a close cousin of apples and pears, and it shares some of their troubles. Iowa State and Wisconsin Extension both note that it can host cedar-quince, cedar-hawthorn and cedar-serviceberry rusts, diseases that spend part of their life cycle on junipers, including eastern red cedar. Utah State Extension advises against planting serviceberry right next to junipers. Fire blight and powdery mildew can also show up in wet, humid years. An open, sunny site with good air movement is the best prevention.

Planting

Open the package as soon as it arrives and keep the roots damp and out of the sun and wind. Plant as soon as you can while the tree is still dormant. If you must wait a few days, Iowa State Extension recommends storing the tree somewhere cool but not freezing, around 40 degrees, with the packing around the roots kept as damp as a wrung-out sponge.

1. Soak the roots in a bucket of water for one to two hours just before planting, and trim off any broken or damaged roots.
2. Dig a hole two to two and a half times wider than the spread of the roots, but only as deep as the distance from the trunk flare (where the trunk widens into the roots) to the bottom of the roots. Wide and shallow is the rule.
3. Build a small cone of soil in the center of the hole and set the tree on it so the trunk flare sits level with the surrounding ground. Spread the roots out evenly; do not bend or kink them.
4. Backfill with the same soil that came out of the hole. Iowa State advises against mixing in compost, peat or sand. Firm the soil with your hands as you go.
5. Water when the hole is three-quarters full and again when it is level with the ground, to settle the soil and close air pockets.
6. Spread a light layer of mulch over the root zone, keeping it pulled back from the trunk.

Spring, before growth begins, is the ideal planting window. Utah State Extension notes that fall planting also works well, since it gives the roots time to settle before summer heat.

First-year care

Water is the whole job in year one. Utah State Extension says newly planted bare-root serviceberries need more frequent watering for the first two weeks, then about twice a week through the first season, keeping the soil moist but never soggy. Iowa State suggests checking once or twice a week and watering whenever the soil around the roots is dry, then easing off as the tree establishes later in the season. Water at the base rather than over the leaves, which helps keep fungal disease down.

Keep a mulched ring around the tree instead of grass. Penn State Extension recommends a light mulch and supplemental water through the first year, and thereafter whenever a dry spell warrants it. Remember that this species is not drought tolerant once the heat sets in, so a deep soak during a dry August is worth the effort even on an established tree. Keep weeds pulled from the mulch ring; serviceberry roots are shallow, so avoid deep cultivation around the base.

If the tree sits loose in the ground after planting, stake it for the first year only, with stakes set in undisturbed soil outside the planting hole and a wide, flexible tie that lets the trunk move a little. Remove the stakes the following spring.

Pruning

Prune while the tree is dormant, in late winter or early spring before new growth appears. For the first three years, Utah State Extension advises removing only weak, damaged or crossing branches and otherwise leaving the tree alone to build its frame. Penn State Extension adds that pruning for an open canopy improves airflow and light, which helps hold off powdery mildew and other leaf diseases.

Allegheny serviceberry naturally wants to grow as a multi-stemmed shrub. If you prefer a single-trunk small tree, NC State Extension notes it must be pruned to that shape. Either form is fine; just decide early. This species suckers less than some of its cousins, but when suckers do appear at the base, Iowa State recommends cutting them off just below the soil surface, in the dormant season and as needed through summer.

Once the tree is bearing, remember that flowers, and therefore fruit, form on wood that is two to four years old. Utah State Extension suggests removing about a third of the oldest stems each year on mature plants to keep a steady supply of young fruiting wood. Like apples, serviceberries tend toward a heavy crop one year and a lighter one the next; that is normal.

Harvest

Despite the name juneberry, the exact timing depends on your elevation and the year. NC State Extension gives June for Allegheny serviceberry in its range, and Utah State Extension describes ripening from late June through July. Wisconsin Horticulture Extension puts it at roughly two to three months after bloom. In the West Virginia hills, expect to start picking in June and to keep going into July.

The berries turn from green to red to a deep purple or blue-black, and the darker they get the sweeter they taste, as Iowa State Extension notes. Pick by hand in the morning after the dew has dried, when the fruit is cool and firm. Serviceberries keep ripening a little after picking, so Penn State suggests harvesting slightly early if the birds are closing in, and draping bird netting over the branches if you want a full crop. Wash and refrigerate or cook the same day; ripe fruit softens quickly.

They taste much like a blueberry, seeds and all, and they work fresh, in pies and cobblers, or cooked down into sauce or freezer jam. Penn State Extension notes there are no research-tested recipes for canning serviceberries, so freeze what you do not eat fresh.