Indigo Treat Honeyberry

Indigo Treat Honeyberry was developed at the University of Saskatchewan Fruit Program by Bob Bors and Rick Sawatzky and released in 2007 as part of the Indigo series, alongside Indigo Gem and Indigo Yum. The three Indigo cultivars are genetic sisters, sharing the same mother and father, and were selected as high-performing siblings of Borealis and Tundra from the same breeding population — all five 2007 releases are Russian and Kuril Islands hybrids of Lonicera caerulea. Germplasm collection for the program began in 1997 after co-breeder Rick Sawatzky read an article on honeyberries in a Minnesota fruit publication; formal crossing began in 2002 with the goal of developing good-tasting, mechanically harvestable fruit suited to continental climates with deep, extended winters. Specific cross parentage for the Indigo series has not been publicly documented by the program beyond the germplasm origins. Indigo Treat was distinguished within its sibling group for sweeter flavor relative to the others in the series, a trait that growers transitioning from Indigo Gem frequently cite as its defining characteristic. The variety has become a standard bearer for the program’s early commercial success in establishing haskap as a viable small-fruit crop across the northern tier of North America.

Indigo Treat's requirement for 1,000 to 1,200 chilling hours places it squarely in cold-region territory — zones 2 through 5 are its wheelhouse, and growers in warmer lowland sites may see inconsistent bearing if winters are mild. A soil pH between 5.5 and 7.5 gives this species unusual flexibility compared to blueberries, which tolerate that full range without the strict acidity demand. Full sun maximizes fruit set and sweetness development, but the shrub handles partial shade without severe yield penalties — useful for food forest understory placement in the 4-to-6-hour sun band. Established plants tolerate moderate dry spells but fruit quality declines if moisture stress hits during berry fill. Because bloom occurs as early as late March, late-frost pockets should be avoided — a north-facing slope or elevated site delays leaf-out slightly and reduces frost risk to the emerging crop. Spacing plants 4 to 5 feet apart within rows and 10 to 12 feet between rows provides the air circulation that keeps the dense canopy dry and reduces fungal pressure.

USDA Hardiness Zone: 2-7
AHS Heat Zone: 1-7
Chill Hours: 850-1050
Sun Requirements: Full Sun to Partial Shade
Soil pH: 5.5-7.5
Soil Type: Well-drained loam or sandy loam; tolerates clay if well-drained
Soil Drainage: Well-drained
Water Requirements: Medium; regular watering especially first 3 years; tolerates some drought once established
Drought Tolerance: Low to Moderate; drought tolerant once established but needs consistent moisture while young
Plant Spacing: 4-5 ft apart in rows; rows 10-12 ft apart
Container Suitability: Yes
How to Prune: Annual pruning not required when young; after 10+ years of fruiting, cut back central woody stems to about 18 inches to rejuvenate; prune after fruit harvest

Indigo Treat forms an upright, dome-shaped multi-stemmed shrub reaching 4 to 6 feet tall and 4 to 5 feet wide — large enough to function as a productive hedge but compact enough for smaller home-scale plots. The moderate-to-fast growth rate means a well-sited plant fills its allocated space within three to four years. Stems are woody and non-suckering, so the plant stays in its lane without the lateral spread management required by some fruiting shrubs. The shallow fibrous root carpet — a characteristic of the species — calls for restraint with mechanical cultivation; hand weeding or surface mulch keeps roots undisturbed. No thorns simplifies harvest and maintenance. Pruning is minimal in the early years; heavy wood renewal doesn't become necessary until the shrub is a decade or more old, at which point cutting central woody stems back to 18 inches after harvest encourages vigorous regrowth from the base. Dark green deciduous foliage drops cleanly in fall without significant color display, making the shrub primarily a productive rather than ornamental landscape element.

Mature Height: 4-6 ft tall
Mature Spread: 4-5 ft wide
Growth Habit: Upright, multi-branched deciduous shrub with dome-shaped crown; medium vigor; no suckering
Growth Rate: Moderate to Fast
Foliage Type: Deciduous
Food Forest Layer: Shrub
Leaf Color: Dark green
Thorns?: No
Attracts Wildlife: Birds (cedar waxwings, robins); native bees (bumblebees, carpenter bees)
Life Span: 30+ years

Indigo Treat blooms from late March through early May, depending on latitude and winter exit timing — placing it among the earliest fruiting shrubs in the spring sequence and making bumblebee pollination critical before honeybee colonies reach foraging strength. The species is self-incompatible: a single plant produces no meaningful fruit regardless of size. Planting at least two genetically distinct honeyberry varieties that overlap in bloom is mandatory. Aurora Honeyberry and Indigo Gem Honeyberry are compatible cross-pollinators with well-aligned bloom windows. For growers in colder zones, planting the cross-pollinator within 50 feet of Indigo Treat ensures efficient bee movement between shrubs during the brief early-spring window. Flowers are pale creamy white, tubular, and produced in pairs along stems; they open before full leaf expansion, giving pollinators clear visual access. Sites with good native bumblebee populations consistently outperform those dependent on managed honeybees for this early-blooming crop.

Bloom Season: Early
Bloom Window: Mid Mar - Early Apr
Pollination Requirements: Self-Incompatible; requires cross-pollination with another unrelated honeyberry variety blooming at the same time
Pollination Mechanism: Insect-pollinated; primarily by native bumblebees and carpenter bees
Flower Color: Pale yellow-white to creamy white

Berries are deep indigo-blue with a reddish-purple interior and average roughly 0.75 inch in diameter — comparable to a large blueberry in cross-section but with an elongated oval silhouette. Flavor is sweet with a complementary tart background; documented tasting notes include blueberry base with raspberry and currant overtones, and Indigo Treat is specifically described as sweeter than most other haskap cultivars, which tend toward higher acidity. Texture is firm with a slight chew — firmer than a ripe blueberry — which helps the fruit hold up during fresh handling and processing. Yields reach 6 to 10 pounds per plant at maturity. Harvest runs from mid-May through mid-July in temperate climate, making it one of the earliest fresh berries of the season. Fresh shelf life is short; refrigerate and use within two weeks. Berries freeze cleanly and retain flavor for up to a year. Culinary applications span fresh eating, jams, jellies, pies, juices, wines, and ice cream. The fruit's high anthocyanin content and vitamin C levels align with other haskap cultivars documented at Canadian research institutions.

Ripening Season: Very Early
Harvest Window: Mid May - Mid Jul
Fruit Size: 0.75 inch (2 cm+)
Flavor: Sweet and tart; blueberry-like with notes of raspberry and currant; described as sweet and flavoursome; sweeter than many other haskap varieties
Fruit Color: Deep indigo-blue with reddish-purple interior
Fruit Texture: Firm; slightly chewy
Bearing Habit: Annual bearer on previous year's wood
Years to Bear: 1-2 years for initial fruit; full production by year 3-5
Storage Life: Short; refrigerate and use within 1-2 weeks of harvest; freezes well
Culinary Uses: Fresh eating, jams, jellies, pies, baked goods, juices, wines, ice cream, sauces; high in antioxidants and vitamin C

Indigo Treat carries moderately resistant ratings against Powdery Mildew (Erysiphe lonicerae) and Botrytis Fruit Rot (Botrytis cinerea), meaning the dense canopy is a managed risk rather than a serious liability. Maintaining inter-plant spacing and pruning crossing interior branches after harvest keeps airflow through the canopy — the most effective practice for reducing both fungal diseases in humid conditions. Botrytis pressure spikes when wet weather coincides with fruit ripening; prompt harvest and removal of shriveled fruit limits inoculum buildup. The most actionable disease concern is Phoma Stem Canker (Phoma caulina / Plenodomus lingam), for which the variety rates moderately susceptible. Inspect stems annually after leaf drop for sunken lesions; prune to healthy tissue with sterilized tools and dispose of cuttings off-site. Avoid bark wounds during cultivation, which accelerate canker development. On the pest side, Spotted Wing Drosophila (Drosophila suzukii) and Aphids (various species) register as moderately resistant, and Scale Insects (Lecanium spp.) share that profile. Forest Tent Caterpillar (Malacosoma disstria) is resisted well. Yellow sticky traps signal SWD population buildup during harvest season; exclusion netting deployed at color break provides effective protection without chemical inputs. Aphid colonies on new growth can be knocked back with a strong water stream or OMRI-listed insecticidal soap when pressure warrants.

Powdery Mildew: Moderately Resistant
Phoma Stem Canker: Moderately Susceptible
Botrytis Fruit Rot: Moderately Resistant
Spotted Wing Drosophila: Moderately Resistant
Aphids: Moderately Resistant
Scale Insects: Moderately Resistant
Forest Tent Caterpillar: Resistant

• Match Pollinators on Bloom Timing: Plant at least one compatible variety — Aurora, Indigo Gem, Berry Blue, or Tundra — within 50 feet; mismatched bloom timing is the most common cause of poor fruit set in honeyberries.
• Protect against Late Spring Frost: Blooms open from late March onward, well ahead of the last frost date in many climates; keep frost cloth or row cover accessible for nights below 28°F during the bloom window.
• Watch Phoma Stem Canker after Harvest: This is Indigo Treat's most actionable disease vulnerability; prune out any sunken, discolored stem lesions after harvest with sterilized loppers and dispose of cuttings away from the planting.
• Mulch Shallow Roots, Skip the Tiller: A 3- to 4-inch layer of wood-chip or straw mulch protects the fibrous root mat from heat and moisture loss; mechanical cultivation tears roots and invites canker entry through bark wounds.
• Net at Color Break for SWD: Spotted Wing Drosophila targets fruit before visible ripeness; deploy fine-mesh exclusion netting (1 mm or smaller) when berries begin shifting from green to blue-purple.

Our 365-Day Plant Guarantee: We ensure that our plants are delivered to you alive and healthy. If your plant does not survive its first year, you're eligible for store credit under these conditions:

1. Your location falls within the appropriate USDA hardiness zone for the plant variety (refer to our hardiness zone map).
2. You maintain the roots' moisture and plant within three days of delivery, following the instructions in our Planting Guide.

If you're concerned about your plant's health, please consult our guide, How to Tell if Your Tree is Dead or Dormant. Remember, our plants are shipped in a dormant state and may leaf out at different times based on their species. To check for plant vital