Blooming-period
 Less then 2 weeks
 2-4 weeks
 4-6 weeks
 More then 6 weeks
 More then once a year

Blooming-season
 spring
 summer
 autumn
 winter

Fragant
 Fragrant
 Non fragrant

Greenhouse
 Warm
 Intermediate
 Cool

Light conditions
 Full shade
 Partial shade
 Bright light
 Full sun

Continent
 Africa
 Europe
 Asia
 Australia
 North America
 South America
 Central America

Species
 Hybrid
 Botanical

Altitude (in tropical zones)
 > 2440 m (Subalpine Zone)
 1830 – 2440 m (Temperate Zone)
 915 – 1830 m (Subtropical Zone)
 < 915 m (Tropical Zone)

photo: Kurt Keller