I have Parks Whopper Cr Improved Vf1f2nt Hybrid started from seed indoors. The plants have healthy leaves and seem to be growing well, but their stems are rather purple.
Is this normal, or the sign of missing nutrients, or other issue?
I'm certainly no tomato expert - I've killed them seven ways from Sunday including dropping an entire flat of beautiful seedlings upside down and killing the whole lot of them - but that purple color is often, I've read, stress-related. Perhaps due to light or temperature.
But you say that the plants have healthy leaves and are growing well. That's good. Personally, I wouldn't sweat it too much. There's probably a tomato expert who can say more about what s/he thinks the problem is. I'm not convinced you have a real problem at this point.