Doubt that's from fertilizer. What did you use?

What kind of mix did you fill the container with? If you made your own, please list ingredients.

Also, please post a picture of the entire plant.

Agree that doesn't look like fertilizer burn in the photo. Not unless the edges are dark brown and it just doesn't show in the pic. But need more details.

For example, any herbicides/weed killers used nearby at all?

Dave

I'll get more pictures in the morning. Not chance of weed killer that I know of. My garden is close to the buckets and there are no issues with those plants. They are in my yard and I don't use herbicides and the no one lives next door. The fertilizer I used is miracle grow for tomatoes18-18-21. I have no clue what else could be causing it. I have 6 different bucket and the all did the same thing on the same day. The weather at night has dropped about 15 degrees and 10-15 during the day. From what I read it looks like some type of stress. I haven't overly watered of anything I have slowed down some watering in the buckets.

Leaves curling like that can be due to various causes.

1- Soggy soil : this is not the sams as overwatering. If your medis is well drained you can water as much as you want. The only drawback will be washing down then nutrients. In this case a pale/yellowish foliage will be an indicator. Sogg soil keeps the air/oxygen out of reach of the root system, causing stressful conditions.

2- Certain varieties are prone to lave curling. I know two examples: Black Krim and Indigo Rose. There can be others.

3- Pests: Some pests also can cause leaf curling.

Herbicide seems to be an easy target, to me. But it is not the sole cause.