Hydrangea paniculata ‘Grandiflora’ (eastern Asia)
Habit: Normal shrub, 2-3 m tall and wide, initially stiffly upright with forked branches; extended and arching due to the weight of the flowers; medium to fast-growing.
Flowers: 20-30 cm long, splendid white panicles, copper-pink when withering, from June to September for weeks, no fruit.
Leaves: Coarse, ovoid, pale green leaves without autumn colours.
Demands: Sunny to slightly shady; frost hardy.
Soil: Acidic to neutral, humic substrates, fresh to moist; needs fertilising often when cut back hard regularly.
Note: To further flower production, the twigs of old shrubs should be shortened by 2/3 every year; remove strong twig completely.
Hardiness: Zone 5a