PL. —Vaccinium corymbosumBotanical illustration — drop image

Vaccinium corymbosum

Highbush Blueberry

SpringSummerFall

4a–7bHardiness zone

Peak bloom windowZone 6b · frost-offset weeks

Winter

Peak bloom

Spring

Not in bloom

Summer

Not in bloom

Fall

Not in bloom

Peak bloom

In bloom

Peak bloom windowZone 6b · frost-offset weeks

Winter

Peak bloom

Spring

Not in bloom

Summer

Not in bloom

Fall

Not in bloom

Peak bloom

In bloom

Background

Highbush blueberry is one of the most rewarding shrubs for the home garden — small white bell flowers in spring feed early pollinators, berries ripen in succession from July through September depending on cultivar, and the fall foliage turns brilliant scarlet and orange. Plant two or more cultivars for cross-pollination and a longer harvest window.

In Zone 6b, early cultivars (Duke, Hannah's Choice, Patriot) ripen from late June into July; mid-season (Bluecrop, Blueray, Bluegold) through August; late season (Herbert, Liberty, Aurora) into September. Half-high hybrids (Chippewa, Polaris, Northcountry) are more compact and very cold-hardy. Soil pH is the single most important factor: blueberries will not thrive above pH 5.5 — test and amend with sulphur before planting.

Good companions

Rhododendron spp.Rhododendron catawbiense Fragaria × ananassa Rubus idaeus

Care guide

SunFull sun; at least 6 hours for best fruiting

WaterModerate; consistent moisture especially during fruit development; shallow-rooted

SoilAcidic (pH 4.5–5.5), well-drained, humus-rich; essential to acidify if pH is above 6

Spacing4–6 feet; plant two or more cultivars for cross-pollination

Height4–6 feet

Zone4a – 7b

Native RegionAL, AR, CT, DC, DE, FL, GA, IL, IN, KY, LA, MA, MD, ME, MI, MN, MS, NC, NH, NJ, NY, OH, PA, RI, SC, TN, VA, VT, WI, WV

Frost hardy

Seasonal tasks

winter

cutPrune in late winter: remove oldest canes (darker bark) to the ground, thin to 6–8 main canes

spring

watchTest soil pH annually; top-dress with sulphur or acidified fertiliser if above 5.5

Common problems

Botrytis (grey mould)

Symptoms

Grey fuzzy mould on petals and stems, worst in cool wet conditions.

Treatment

Remove affected parts immediately. Improve air circulation. Avoid overhead watering. Apply copper fungicide if severe.

Spotted Wing Drosophila

Symptoms

Soft, collapsing berries with small puncture marks; white larvae inside ripening or ripe fruit.

Treatment

Harvest fruit promptly and frequently. Remove and dispose of overripe or fallen berries. Use fine-mesh netting or traps. Refrigerate harvested fruit immediately.

Japanese Beetle

Symptoms

Metallic green-and-bronze beetles feeding on leaves and flowers, leaving lacy, skeletonized foliage and chewed petals.

Treatment

Handpick beetles in early morning and drop into soapy water. Avoid pheromone traps, which attract more beetles. Treat soil for grubs if infestations recur yearly.

Mummy Berry

Symptoms

New shoots and leaves wilt, blacken, and die in spring. Infected berries turn tan or pink, shrivel into hard 'mummies', and drop to the ground.

Treatment

Remove and destroy mummified berries and blighted shoots. Rake and dispose of fallen fruit and leaves. Apply 2 inches of fresh mulch in early spring to bury overwintering spores, and prune for airflow.

Blueberry Stem Blight

Symptoms

Sudden wilting and browning of leaves on individual canes, with reddish-brown discoloration in the wood beneath the bark. Affected canes die back, often spreading downward from a wound.

Treatment

Prune out infected canes 6–8 inches below visible discoloration and destroy them. Disinfect tools between cuts. Avoid wounding plants and keep them vigorous with proper water and acidic soil.