Hi Demi and welcome to GoY. Sorry you are going to need to be a bit more specific to start with what plant/shrub/tree have you got that has curling leaves?

LOL my toes curle in the winter to lol

Hi Moon growe, my plant with the curly looking leaves is an agapathus.

Okay so are you growing in the ground or in a container - in what sort of conditions? Have you been giving the plant the same care as usual over the past months?

Damage from herbicide sprays that drift onto the agapanthus foliage includes curling, cupped leaves and brown or dead spots on the leaves. These symptoms mimic a number of other disease and pest problems. To determine if the plant was damaged by herbicide, check the leaves for the appearance of a spray pattern. Damage typically occurs within two days of the nearby application of herbicide. The treatment of herbicide damage depends on the type of herbicide and the extent of the damage and includes allowing the plant to recover on its own while reducing any stresses to it, such as lack of water and fertilizer.

Look at sfgate.com/agapanthus-dead-foliage - This is were I got this information from

Even the steaks curl in Australia ;o)

lol Myron!