Blueberries are a 50-year crop. The bushes you plant this spring will still be producing when you're retired, assuming you get the soil right. Get the soil wrong and you'll spend years watching struggling plants produce almost nothing. The good news is that fixing the soil before planting is straightforward — fixing it after the fact is not.
The Soil Requirement
Blueberries require acidic soil — pH 4.5 to 5.5. This is significantly lower than most vegetables (which prefer 6.0 to 7.0) and lower than most New England garden soil even without amendment. The specific pH range isn't a preference — it's a requirement. Outside this range, blueberries cannot absorb iron and manganese, become chlorotic (yellowing leaves), and produce poorly regardless of how much fertilizer you apply.
Test your soil before planting. If pH is above 5.5, lower it with elemental sulfur applied at least 6 months before planting — it works slowly. For established beds, annual applications of acidified fertilizer and acidic mulch (pine bark, pine needles) help maintain the right range.
Variety Selection
Highbush blueberries (Vaccinium corymbosum) are the standard for New England. They're cold-hardy to zone 4, produce large berries, and are available in early, mid, and late-season varieties. Plant at least two different varieties for cross-pollination — blueberries are self-fertile but produce significantly larger berries and better yields with a pollinator nearby.
Good variety combinations for New England: Bluecrop (midseason, reliable, widely adapted) paired with Duke (early), Bluejay (midseason), or Elliott (late). This combination spreads the harvest window from mid-July through September.
Planting
Plant in early spring before growth begins or in fall at least 6 weeks before hard frost. Dig a hole twice as wide as the root ball and amend backfill with peat moss at a 50/50 ratio — peat is acidic and improves drainage in clay. Space highbush varieties 4 to 6 feet apart.
Remove all flowers in the first year. This is painful but important. Letting a first-year plant set fruit diverts energy from root development. A plant with an established root system in year two will produce more fruit over its lifetime than one that fruited in year one.
Mulching
Blueberries have shallow, fibrous roots that dry out quickly and compete poorly with weeds. Mulch heavily with pine bark, pine needles, or wood chips — 4 to 6 inches — extending well beyond the drip line. Refresh mulch annually. This is the single most important maintenance task for blueberries after soil pH.
Pruning
Young blueberry plants (years 1 to 3) need minimal pruning — just remove dead or damaged wood. Mature plants produce best on wood that is 2 to 6 years old. Annual pruning removes the oldest, least productive canes and encourages new growth. In late winter, remove any canes older than 6 years (grey, peeling bark), any crossing canes, and any low canes growing along the ground. Leave 6 to 8 strong, upright canes per bush.
The Long Game
Year one you plant and remove flowers. Year two you get a small harvest. Year three you get a real harvest. Year five you have a producing blueberry patch. Year ten it's part of the landscape. Year fifty your grandchildren are still picking from the same bushes. Few garden investments have this kind of return on initial effort.
Whatever you're growing this season — grow it well.