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(Iris spp)
Introduction
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 The Iris is a widely grown genus of plants, which have been used for ornamental purposes for many centuries. Irises have a spear-shaped stem with 1–3 flowers, on which three petals stand upright and three petals hang down.
Irises can be divided into two groups: those that grow from rhizomes (bearded) and those that grow from bulbs (unbearded).
Most of the more than 300 species grown from rhizomes and are used mainly for garden plants. They flower from early spring to mid-summer. Flower colours include white, pink, blue, gold and red. The Dutch and Spanish Irises grow from bulbs. The plants form attractive clumps and flower in summer and flower colours include blue, bronze, yellow and white.
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Growing Irises
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| Propagation: |
Plants grow from rhizomes or bulbs. |
| Plant Density etc: |
Bulbs are planted at various densities depending on variety and size of bulb.
8–9cm circumference 250m2
10+cm circumference 200m2 |
| Time of flowering: |
Autumn |
| Crop protection: |
Protection from the wind is required. |
| Soil type: |
Irises need a soil that is free draining and has good structure. A silt or sandy loam is suitable. pH 6–6.5 |
| Fertilisers: |
A range of nutrients is needed to grow Irises successfully. Calcium is especially important. |
| Pest/Diseases: |
Aphids, Bulb flies, Nematodes, virus diseases |
| Harvesting: |
Flower stems are cut at soil level. Stems are usually bunched in fives or tens and may be slipped into plastic sleeves and can then be stored at 0–10°C for up to four days. |
| Marketing: |
Irises are sold predominately on the local market. |
| Further Info: |
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Related Topics
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