I have three orange trees and one grapefruit. They are about three years old. They all have curling leaves.?

Question

Is this normal or is this a pest or disease?

Answer 1

I don't know about orange and grapefruit trees, but I know that some plant's leaves curl inwards towards the stem when they are not getting enough water or if it is too cold.

Answer 2

Which way are the leaves curling? Up usually means they need water down means they have too much.