leaf spot
Brown spots and patches on the leaves that merge together is likely a sign of the fungal disease leaf spot. Remove and dispose of any affected leaves and clear away any dead debris below the plants.
rhizome or bulb rot
The fungal disease rhizome rot or bulb rot can affect irises. Before planting you may notice soft spots, slimy bits or a bad smell. If they are already planted, the leaves may yellow or lose their colour from the bottom up and the plant can flop and collapse.
If rhizomes are affected (bearded irises) it is possible to cut away the affected parts of the rhizome and replant in a different spot. But since irises are so cost-effective in the long run (returning year after year), you might decide it’s better to start again with healthy rhizomes. If it’s a bulb, then it should be lifted and disposed of.
why are my irises not flowering?
This could be a number of things. Perhaps overcrowding – bearded irises in particular do not like to be shaded by other plants. Shade in general may impact flowering. It could also be rhizome or bulb rot, or potentially the foliage was removed too early the previous year, weakening the bulb and affecting flowering this year.
do squirrels, deer or rabbits eat iris bulbs?
Squirrels will steal the bulbs. It’s unlikely deer or rabbits would eat the bulbs, but they may nibble on the foliage. Irises are toxic to rabbits.
why are my irises falling over?
Bearded irises can reach sizable heights and may fall over in the wind. Taller types should be planted in a sheltered position and you can even stake irises individually with a cane.
why are my irises drooping?
It could be rhizome rot. But also look out for underwatering during a drought, particularly for irises in pots. And for waterlogged soil or compost – irises will not enjoy soggy conditions.
why are my iris bulbs rotting?
Wet weather or damp and humid conditions can cause rot. When storing bulbs and rhizomes, ensure they are somewhere dark, dry and cool.
