Hi, 

We suspect it is tough due to our high heat conditions. Celery is a cool weather crop and needs consistent water and fertilizer. Perhaps some afternoon shade would be helpful. 

Have you grown it successfully before? There are different varieties you could try that are more tender. Do you know what variety you planted?

You can review with growing guide and information from the University of Kentucky Extension for more guidance and let us know if you have additional questions. 

Emily