ABOUT BEARDED IRISES
To avoid plant stress – We dispatch Bearded Irises between the months of February through to August. However if you would like your Irises to flower this spring, it is best to purchase the rhizomes between February – April, allowing them enough time to settle and grow.
They are extremely hardy and make a wonderful display in many Australians gardens. They also make wonderful cut flowers, lasting for up to a week.
Cultural Notes on Bearded Irises Grown in Australia
They like a slightly acid to alkaline soils. A pH of 5.5 to 7.5.
Cool to cold winters…..lack of cold produces very short stems and minimal blooms.
They like hot summers, grown in full sun all year round is best which promotes rapid increase and greater quantity of blooms, but in very hot areas they may benefit from some afternoon shade.
They appreciate a good slow release fertilizer (9 months) or organic fertilizer (dynamic lifter). For poor soils bulk it up with MIXED IN WELL cow manure, a sprinkle of dynamic lifter and compost.
Do not place water-holding mulch, compost or manures directly on top of the rhizomes or they may rot, also a high summer rainfall can cause rot, so raise the beds of Irises about 1 inch above the surface of the garden, for better drainage. I have clay based soils with heavy rainfalls during winter, and I have found this method to help prevent rot.
They are best divided (every 2-4 years) soon after flowering (Nov-Dec) or late summer (Mar-May), but they will survive being moved almost any time. However, if you must move them in Jan-Feb (in hot climates), be careful not to over water and induce rot.
One good watering after transplanting is sufficient and a good soaking once a week there after over the hot summer season.
Bearded Irises should not be planted deeply, in most areas of Australia they are best with 1-2 cm of soil over the rhizome. In hot climates allowing the rhizome to be exposed can cause scorching.
Dwarf Irises
These are highly floriferous and form delightful flower carpets. They are easy to grow but do require full sun and frosty winters and lose well-drained soil. Do not allow to dry out totally, over summer.
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Happy Gardening
Shelli Green