Is the plant in the ground or in a container?

If in a container, what growing medium are you using? How large is the container? Is it self-watering or do you manually water it? Is the container in full sun, part sun or shade?

For both container plants and inground plants, it would be helpful to know these things as well: How often do you water? Have you checked the moisture of the growing medium or soil 3-5" below the surface? Is it dry, just right, or soggy? Are you feeding the plant? How often? What are the NPK values of any fertilizers you are using to feed it? What has the weather been like in your area?

If the plant is in the ground: Have you used any amendments? Do you mulch? If so, with what and how much (how deep)? Are there any other plants near the problem plant that are showing similar issues?

Can you post pictures?

The more information you can give us, the better the chances that someone can give you an accurate diagnosis.

Betsy