'Ilgonis'
Flowering time:
end of May-beginning of June
Flowers: purple
Leaves: evergreen
Height: 1.8 m (in 25 years)
Width: 2.7 m (in 25 years)
Hardiness: good (-25°C)
Growing: In shade, in acidic (pH 4.5-5.5), moderately moist, loose, rich in humus and permeable soil