Looks like calcium deficiency. What's your soil pH? If it's below 6.0 then you might want to look into adding a calcium supplement or adjusting the pH.

Calcium deficiency can also be caused by high levels of salt. Sodium competes with calcium. What's the water like where you are? How much salt is in it?

How long ago did you fertilize? Sometimes overfertilization causes salt build up.

You should also look into Molybdenum deficiency.

Thanks for posting the chart. Great reference!

please post a pix of the entire plant.

Do you flush with clean water occassionally? You may be over fertilizing.

It is in the ground. Sorry if I posted in the wrong forum and is this the case?

I took a similar leaf into a nursery. They thought the deformity had to do with a bug attacking the plant. Since, I have used Safer to rid the possible cause to another plant I have outside (shrub) and it is helping. Most likely need a stronger medicine (per the suggestion from the nurseryman). Sorry I can't remember what the pests name was as it's been a long time since my neighbor's planted wall between yards had the problem. Unfortunately, I volunteered to eradicate for them until I realized I was dealing with a major chemical. No good deed goes unpunished... yada yada I'll post a pic later today.

Herbicide? Perhaps drift from fall cleanup?