How to Grow Irises? A Full Guide to Cultivation Methods

  Irises come in many varieties, with rich and vivid flower colors, making them a highly ornamental flowering plant that can be used not only in landscaping but also grown as potted plants. The iris plant typically reaches a height of 80-90 cm and blooms in the warm month of May, which happens to be a perfect time for flower viewing.

  Potted irises can be propagated from small plants via bulbs, usually planted in September in autumn; with good care, they can bloom the following year. They can also be propagated by sowing seeds, but this method of raising seedlings has relatively high requirements, and plants usually do not bloom until the third year after being potted. But no matter which method is used to propagate the young plants, we must do a good job with care and management, especially the routine care once the plants are established.

  So, how do you grow potted irises? Drawing on my own experience and tips shared by fellow gardeners, I would now like to share the cultivation methods for irises with everyone, hoping it will be of help.

  1. Potting Soil Preparation

  Irises like to grow in fertile soil rich in humus, and unlike most potted flowering plants, they also like clayey soil, or growing them in pots with alkaline soil mixed with lime gives even better results. This is because the iris is an acid-loving flower; if grown in acidic soil, it will show poor growth.

  2. Light and Temperature Environment

  Irises grow best in an environment of 15°C-17°C, so when growing them in pots, we should adjust the temperature of the growing environment in a timely manner to keep the plants in good growing condition. Also, during prolonged high temperatures in summer, appropriate shading is needed to prevent the plants from getting sunburned.

  3. Humidity Requirements

  Irises prefer growing in humidity of 75%-80%, which shows they are a fairly moisture-loving plant. When humidity is too high on rainy days, reduce it promptly by heating and improving ventilation, so as to better keep the plants in healthy growing condition.

  4. Watering and Moisture Replenishment

  Irises prefer a moist growing environment, so their water requirements are naturally relatively high. If there is insufficient water or frequent water shortages during routine care, the plants may well show slow sprouting and poor development. Also, besides watering promptly, moisture replenishment should be even; when necessary, you can also spray water on the leaves to retain moisture and cool them, while also keeping the branches and leaves clean.

  5. Fertilizing and Top-Dressing

  Before transplanting irises into pots, to increase the nutrients in the pot, it is usually necessary to add some rotted compost, and you can also appropriately add some bone meal, plant ash and similar materials as a base fertilizer. During the growing season, since the plants need to maintain rapid growth, an appropriate amount of chemical fertilizer should be applied as a top dressing; especially before flowering, to improve flower quality, 1-2 applications of chemical fertilizer can be given.

  6. Pest and Disease Control

  The main disease that potted irises are prone to during care and management is soft rot. Once a plant is found to be infected, dig it out promptly, cut off the rotted parts, disinfect and sterilize it, then replace the pot and soil and replant. From April to May, you can water in some wettable phosmet to prevent pest problems. Also, after winter arrives, promptly clear away dead branches and fallen leaves and keep the leaves clean to reduce the risk of pests and diseases.