This is a picture of the leaves on my Purple Russian (I think) tomato plant. It's growing well, though a little behind my other two varieties in setting flowers and fruit. However, it does have a lot of flowers, now, and some fruit. But the leaves look like there's a problem. What do they need?
These are container-grown in a large terra-cotta pot. I put in a granular fertilizer at planting but haven't done more since. (Last year, I tended to over-fertilize and got almost nothing, so I've tried to be more judicious!)
Thanks for any help and advice!