By Hazelt
South Africa 
Hi there - I came across an earlier question re curling leaves on arum lilies - I have the same problem. These are new plants, situated against a brick wall with a sprinkler system. The leaves curl up, acquire a bluish colour and the leaves seem to rot from the base. They are in full morning sun and at this time of the year they are in shade from about 2pm. I'm in north-western Johannesburg. The rest of the plants in the same bed are very happy and the soil doesn't seem to be too wet. Any answers? Thanks.
14 Apr, 2017
Answers
When you say Arum, do you mean Zantedeschia? Arum is a particular plant, but the name arum is often used as a common name for Zantedeschia varieties.
15 Apr, 2017
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welcome to GoY.
Arum tend to be a plant happier in some shade. the heat/sun will cause the curling of the leaves. They are really a woodland/hedgerow plant.
14 Apr, 2017