Lonicera caerulea

Haskap (Lonicera caerulea)
Scientific name	Lonicera caerulea[1]
Common names	Haskap, honeyberry, blue honeysuckle[1]
Genus	Lonicera
Family	Caprifoliaceae
Order	Dipsacales
Habit	Deciduous woody shrub
Typical cultivated size	3–6 ft (0.9–1.8 m)[2]

Lonicera caerulea, commonly called haskap, honeyberry, or blue honeysuckle, is a cold-climate fruit shrub grown for its blue berries. Regional types and cultivars differ in climate response, ripening behavior, and productivity, so a cultivar's origin matters when selecting a site or pollinizer.^[2]

Description

This is a compact woody shrub generally described at about 3–6 ft (0.9–1.8 m) in cultivation. The Wisconsin crop profile describes plants without thorns or suckers and distinguishes regional subspecies by productivity, maturity, ripening uniformity, and berry drop.^[2] The accepted species is Lonicera caerulea; haskap, honeyberry, and blue honeysuckle are useful common names for the crop.^[1]

Cultivation

Soil and water

Use a well-prepared planting site with reliable moisture and drainage. Extension guidance places the crop across a broad soil-pH range, approximately pH 5.5–8, and emphasizes moisture management during establishment and production.^[3][2] Keep the root zone from swinging between drought and prolonged saturation, adjusting irrigation to the soil and the local season rather than applying one fixed schedule.

Sun and humidity

Choose exposure appropriate to the cultivar and local climate. Russian and Kuril material and Japanese material do not respond identically in warmer regions; Utah guidance reports warm-climate injury above zone 6 for some plantings, so a cultivar described as suitable for a cold site should not automatically be treated as heat tolerant.^[3] Maintain enough air movement around the canopy to reduce prolonged leaf wetness; powdery mildew is an occasional problem noted in extension crop guidance.^[2]

Seasonal changes

Flowers are described as frost hardy in the Wisconsin crop profile, while fruit can ripen as early as June in suitable regions.^[2] Plan dormant-season pruning, and keep moisture available through active growth and fruit development; the timing of irrigation and harvest will shift with cultivar and climate.^[3] In warm locations, protect the plant from the heat conditions associated with the selected regional type rather than assuming that all haskap selections have the same seasonal response.^[3]

Propagation

Use cultivar-identified planting stock and plan compatible pairs from the beginning. The two extension accounts require cross-pollination between unrelated, compatible cultivars with overlapping bloom, making cultivar identity important even when the immediate goal is simply to establish a small planting.^[3] A named selection also preserves the climate and harvest information attached to that material; do not treat an unlabeled plant as interchangeable with a named haskap cultivar.

Flowering, fruiting, and harvest

Plant at least two compatible, unrelated cultivars whose bloom periods overlap; a single plant or two selections with non-overlapping flowering may produce poorly even when both are vigorous.^[3] The Wisconsin crop profile describes flowers as frost hardy, but regional type and cultivar still influence fruit set and maturity.^[2]

Some plants may begin bearing in years 1–2, with larger crops around years 3–4. Mature-plant yield is reported as about 5–15 lb (2.3–6.8 kg) per plant in Utah guidance, but that figure is cultivar- and climate-dependent rather than a guaranteed yield for every selection.^[3] Ripening can be early, and regional types differ in how uniformly berries ripen and how readily they drop; monitor fruit closely as it colors and harvest with the selection's behavior in mind.^[2] Birds can be a significant crop problem, so fruit protection may be needed where bird pressure is high.^[2]

Fruit and uses

Haskap fruit is used fresh and in frozen or processed products.^[2] A 2024 comparative metabolomics study examined four L. caerulea ssp. caerulea varieties, one ssp. kamtschatica variety, and five wild accessions, reporting 151 detected compounds across the sampled material and differences in prevalent anthocyanins.^[4] Those analytical differences describe the sampled berries; they do not by themselves establish a food-safety, therapeutic, or universal nutritional claim.

Cultivars and breeding

Cultivar choice is central to haskap production. Extension guidance distinguishes Japanese from Russian and Kuril material and describes differences in warm-climate response, maturity, yield, and harvest behavior.^[3]

North Dakota State University's Northern Hardy Fruit Evaluation Project records an orchard evaluation established in 2006–2008 with more than 750 plants. Its stated evaluation categories include adaptation, disease resistance, production practices, winter hardiness, productivity, fruit quality, pruning, fertilizing, harvesting, fruit measurements, vigor, insect and disease pressure, bud injury, and winter survival under central North Dakota conditions.^[5] The University of Saskatchewan Fruit Program describes haskap breeding in one of Canada's coldest climates, including work toward mechanical-harvesting capability in fruit crops.^[6]

References

• ↑ [1] Lonicera caerulea L. - Plants of the World Online.

• ↑ [2] Honeyberries - Crops and Soils, University of Wisconsin.

• ↑ [3] Haskap in the Garden, Utah State University Extension.

• ↑ [4] Nawaz et al. 2024, Global metabolome profiles of Lonicera caerulea and Lonicera caerulea ssp. kamtschatica, DOI 10.55730/1300-011X.3216.

• ↑ [5] Northern Hardy Fruit Evaluation Project: Haskap, North Dakota State University.

• ↑ [6] USask Fruit Program, University of Saskatchewan.