A1 = up to 4 m and more, leaves about 10-12 cm, flower-trusses medium size

A2 = up to 4 m or more, leaves usually much longer than 10 cm, flowertrusses 20 cm or more

A3 = about 2-4 m high and as wide, leaves about 10-12 cm, flowertrusses medium sized

A4 = about 2-4 m high and as wide, leaves usually much longer than 10 cm, flowertrusses large.

A5 = about 2 m high and about as wide, leaves always ovate, flowertrusses of various shapes

A6 = lower than 2 m, usually becoming quite wide, leaves ovate, flowertrusses differntly shaped

B/L = Limited availability, often already sold out early in the season

B1 = up to 2 m and as wide, rounded leaves, bell-shaped flowers in loose trusses

B2 = up to 1 m high and as wide, leaves rounded, bell-shaped flowers in loose trusses

B3 = up to 1 m and normally as wide, leaves 6-10 cm long, trumpet-shaped flowers in dense trusses

B4 = up to 1 m and much wider, leaves 3-7 cm, flowers trumpetshaped in loose trusses

B5 = hardly higher than 50 cm and much wider, leaves 1-5 cm long, flowers in small trusses or solitary

C1 = up to 2 m high, leaves 3-5 cm, flowers small, funnel-shaped in small trusses

C2 = up to 1 m high and as wide, leaves small, 2-5 cm long, flowers funnel-shaped in small trusses

C3 = about 50-60 cm high and usually as wide, leaves small, 2-5 cm, flowers funnel-shaped, small trusses

C4 = not exceeding 30 cm, much wider, leaves small, 1-3 cm long, flowers in small trusses or solitary

D1 = up to 4 m or more, deciduous, flowers in tight trusses

D2 = up to 2 m or less, deciduous, flowers in tight trusses

ZZ = dwarf varieties