Q.calla lilies / coloured arum lilies
i have the above flowers in containers as well as in the garden. This year they had 50% flowers than normal and a few days after the flowers have opened, the beautiful bright colours changes to a terrable darky mixture of coloures.They also die down very quickly thereafter.
COULD IT BE THAT I HAVE TOO MANY BULBS IN A CONTAINER OR COUD IT HAVE SOMETHINH TO DO WITH THE PH OF THE SOIL. i MOSTLY UDDSE RAINWATER SO I DOUBT THAT WATER COULD BE THE PROBLEM. I FEED THEM ONVE A MONTH WITH PLANTFOOD FROM OUR LOCAL NURSERY.
please help !!
KIND REGARDS
DEON ERASMUS
PORT ELIZABETH
SOUTH AFRICA.

The longevity of blossoms can vary greatly due to weather and temperatures, even moisture levels. A crowded pot could also effect the health of the blossoms.
Here is an article that will help you with plant division.
https://www.gardeningknowhow.com/ornamental/bulbs/calla-lily/dividing-calla-lilies.htm