[al78]

I noticed in a friends greenhouse one tomato plant which looks a bit sickly, the leaves are yellowing or curling up. The other plants in the greenhouse look healthy. What could be the cause of this?

[oldgrunge]

Mine look like that all the time!😀. Seriously, though, some plants are not as vigorous as others, and struggle a bit.

[Goosegirl]

Their leaves often curl up but this looked a bit under stress, so try a dilute seaweed feed in case it's not getting certain minerals like it should.