PL. —Lonicera involucrataBotanical illustration — drop image
Lonicera involucrata

Twinberry Honeysuckle

SpringSummerFall
3b9aHardiness zone
Peak bloom windowZone 6b · frost-offset weeks
Winter
Not in bloom
Spring
Not in bloom
Summer
Peak bloom
Fall
In bloom
Peak bloom
In bloom
Background

Lonicera involucrata is a deciduous native shrub found across western and northern North America, from Alaska to Mexico and east through the Rocky Mountains. It produces paired tubular yellow flowers backed by conspicuous red to deep purple bracts, followed by twin glossy black berries — a reliable shrub for wildlife value from early spring through late fall.

This shrub naturally grows along streambanks, forest edges, seeps, and moist mountain meadows, making it well suited for rain gardens, riparian buffers, and any site with consistent soil moisture. It tolerates part shade under a light canopy, useful along woodland garden edges. Hummingbirds and bumblebees work the flowers heavily, and the black berries are eaten by many bird species including cedar waxwings, robins, and thrushes. Mature plants spread slowly by layering and may sucker lightly at the base; removing the oldest canes periodically keeps growth vigorous and the shrub center open. A 2–3 inch mulch layer over the root zone conserves moisture and moderates soil temperature, which is especially useful in the warmer end of its range.

Several Pacific Northwest and Great Plains Indigenous peoples used bark and leaf preparations for skin ailments and eye washes. The berries were documented as a purgative in some groups but are considered mildly toxic and should not be consumed as food.

Care guide
SunFull sun to part shade
WaterMoist to wet
SoilMoist to wet, humus-rich
Spacing4–6 ft
Height3–8 ft
Zone3b – 9a
Native RegionAK, AZ, CA, CO, ID, MI, MN, MT, NV, NM, OR, UT, WA, WI, WY
Frost hardy
Seasonal tasks
spring
cutCut dead or broken stems to the base before new growth emerges.
watchCheck new shoots for aphid colonies; dislodge with a strong water stream or apply insecticidal soap if populations are heavy.
sowPlant container-grown shrubs in moist, amended soil at nursery-pot depth; water in thoroughly to settle roots.
summer
watchMonitor soil moisture during dry stretches — this shrub drops foliage early when drought-stressed.
watchInspect leaves for powdery mildew in crowded or low-airflow plantings; thin surrounding stems if found.
fall
cutAfter berries are spent, remove the one or two oldest canes at ground level to encourage vigorous new wood for next season.
sowCollect ripe berries, macerate and rinse the seeds clean, then cold-stratify in moist sand at 35–40°F for 60–90 days before spring sowing.
Common problems

Honeysuckle Leaf Blight

Symptoms

Brown or black spots on leaves that enlarge and merge, followed by curling, browning, and early leaf drop, often worse in wet seasons.

Treatment

Remove and destroy infected leaves, thin growth to improve airflow, avoid overhead watering, and apply a copper-based fungicide if the problem recurs.

Powdery mildew

Symptoms

White or grey powdery coating on leaves — usually starting on older growth in humid conditions or when nights cool.

Treatment

Improve air circulation by thinning plants. Apply neem oil or potassium bicarbonate spray at first sign. Avoid overhead watering.