Lonicera caerulea (Europe, northern Asia, Japan)
Habit: Small shrub, 0.5-1.5 m, rarely up to 2 m tall and wide; dense-upright to arching; moderately growing.
Flowers: Small, funnel-shaped, in pairs, yellowish white, April to May; slightly fragrant.
Fruits: Elongated, ovoid or round double berries; black and blue glaucous; not poisonous, but edible, though they taste sweetish/bitter and are slimy.
Leaves: Elliptical, ovoid, early shoots at beginning of April, conspicuous light green, later dark green, bluish green underneath, pale yellow-green in autumn.
Twigs: Very decorative yellowish to reddish brown or cinnamon-red bark that peels in winter.
Roots: Shallow roots, resistant to root pressure from large trees.
Demands: Shady; likes cool areas, frost hardy; likes high to extremely high humidity.
Soil: Moist to damp, sensitive to drought; extremely acidic to neutral, avoids chalk, all sandy-humic or sandy-loamy substrates, poor soils.
Hardiness: Zone 3