Rhododendron Polarnacht
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The darkest purple in the genus, deep enough to read almost black in low light, with ruffled petals. Rhododendron Polarnacht grows 2 to 3 feet tall and 5 to 6 feet wide in part shade, hardy from Zone 6 through Zone 8.
The habit spreads considerably wider than tall, forming a low broad mound rather than an upright shrub.
The large-leaf rhododendrons hold their foliage year-round rather than thinning like the small-leaved types. Below about 25 degrees the leaves droop and curl up, curling tighter the colder it gets, and they open again within hours once temperatures rise. It looks alarming the first winter and it is entirely normal, a water-conserving response rather than a sign of trouble.
Dark flowers read best against a light background or where afternoon light catches them, since they disappear into deep shade. Acidic soil is necessary, roughly pH 4.5 to 6.0, with good drainage and steady moisture. Mulch the shallow roots.
Height 2'- 3' Spread 5'- 6'
USDA Hardiness Zones 6-8
Lowest Temperatures -10°F to 0°F
Part shade - 4 to 6 hours of direct sun per day, mostly before midday
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