Meaning of the first digit : General growing place :
1 : WOODLAND. Plants, that in a garden need to be planted close to trees or shrubs. They require shade and prefer a peaty soil.
Meaning of the second digit: Specific demands :
1 : Plants for light shade and a rich, fairly moist soil, with not too many tree-roots. For example near buildings or fences.
Meaning of the third digit : Where to put :
2 : Not too sunny, for instance in a darker corner of a border.
