Polish Linguisa tomatoes

Is anyone else growing these? Mine are yellowy looking, despite being fed the same as the other plants, all of which are a healthy dark green with plenty of flower buds developing.

I have one plant in the border in the heated greenhouse, and some in six inch pots which are outside during the day and back in the greenhouse at night.

Just wondered if anyone else had the same problem?

I don't think anything can piddle that high, Trillium. They are on staging in the garden during the day, and in the greenhouse at night.

I shall have to get some Epsom Salts I think, and see if that helps. Can't think of anything else to do really.