How to care for Beardes Irises for spectacular blooms ?

Bearded Irises are among the most striking perennials you can grow in Australian gardens. With their tall stems, sword-like leaves, and spectacular flowers, they bring elegance and colour to your gardens. Best of all, they thrive in Perth’s sunny climate when planted and cared for correctly.

In this guide, we’ll cover everything you need to know to grow Bearded Irises in Perth and across Australia, from planting and dividing to fertilising. 

1. Best growing location for Iris in Australia

Bearded Irises grow well in cool to subtropical climates, making them perfectly suited to most parts of Australia, including Perth. Choose a sunny spot in your garden as bearded iris need at least 6 hours of sunlight each day to thrive. 

2. Soil preparation in your garden 

Plant your irises in well-drained soil. If your soil is heavy or clay-like, consider amending it with compost or sand to improve drainage. Irises do no like wet feet, so it's essential that soil is well drained to avoid root rot. 

3. How to plant Iris Rhizomes for optimal grow ?

The secret to successful Bearded Irises lies in planting the rhizomes correctly : space the rhizomes (the thick, horizontal stems) about 30-40 cm apart to give them room to grow. Keep the rhizome at or just above soil level. Do not bury it completely, as this can cause rotting.

4. Fertilising method for Irises

Fertilise your bearded irises in early spring, with a balance, slow-release fertilizer with a ratio 5-10. This is when the plants are actively growing and can most effectively use the nutrients. Be cautious not to over-fertilize, as this can lead to excessive leaf growth at the expense of flowers. Too much nitrogen, in particular, can inhibit blooming. Consider a second, lighter application of fertilizer after the irises have bloomed to help them store nutrients for the following year. 

5. What about Mulching ?

A light mulch can be applied to the soil but avoid having the mulch cover the rhizome which should be exposed to sunlight to produce flowers and avoid rotting of the rhizome.

Bearded Irises are a must-have for any Australian garden. By following these expert tips for caring for your flowers, you can enjoy later a stunning display of colorful blooms in your garden. With the right care and attention, these beautiful irises will reward you with their beauty year after year.