My capsicum plant was looking healthy and has been well watered, but now the leaves are curling. Does anyone know what the issue might be?
It's most likely that you have a sap-sucking pest. The insect is sucking all the nutrients out of the leaf, causing it to curl. A pyrethrum spray or something like this should get rid of them - https://www.bunnings.com.au/yates-750ml-nature-s-way-vegie-and-herb-pest-spray_p2961940