number : 6 tot 9 per m2
- little groups of 3 to 10 plants (B) - groups of 10 to 20 plants, even more (C)
Plant description
The species of this interesting genus can differ for the garden. There are bulb-forming and non-bulbforming irises. The non-bulbforming usually have creepers and are winter hard. The bulb forming kind usually need protection in winter. A calcareous soil is desirable. Iris x germanica calls for a not too moist drained soil and a sheltered warm place.