I have three Red Heirloom Tomato plants in AG Ultra LED that have been growing for 46 days. They seem probably ok so far, but my first and only attempt at growing tomatoes before (the Mega Cherry Tomato kit) in the same garden didn't go well, as the plants ended up developing yellow leaves that would brown and fall off faster than new healthy green growth would come in. We got maybe a couple dozen tomatoes off the thing before we gave up. I picked a different seed kit for this time around and am trying to be extra vigilant about things like pruning so I don't have a repeat, and hence posting here at the first signs of possible trouble. I'm just hoping there's not something toxic about my environment that makes it fundamentally unfit for growing tomatoes!
I'll start by saying that I think I'm doing the basics right. I empty the reservoir and put in fresh water with new nutrients every two weeks. The LED panel just advised me to do the first pruning, so I did that several days ago. I must admit that these seem even more "dwarfy" than the Mega Cherry ones (see attached photo), so it almost felt weird doing a prune now because the trunk was coming in thick, the leaves were spreading out wide, and while there were lots of buds forming, it didn't seem like it was in a hurry to grow upward toward the lights (I'd only raised it once up to that point, about an inch). But the AG materials say prune, prune, prune, so I went with it. The trunk was actually pretty thick even near the top. Here's hoping it was the right choice!
Anyway, at this point my primary concern is that there are "bumps" on the trunks of all three plants (see attached photo). These were definitely not present on the Mega Cherry ones, which just had classic tomato "fuzz". I couldn't find anything online saying these bumps were common with this variety, so I wanted to check if anyone else has seen this, if it's something to be worried about, etc. The good news is that it's not like there's bumps on the leaves, nor do I see signs of bugs anywhere.
Second, in just the past few days, I've seen some of the lower leaves starting to turn yellow. I know the materials talk about this being somewhat normal, but once again, these plants are still so short, it feels a little premature. Should I cut them off at the first sign of yellowing, rather than waiting for them to turn fully brown? Should I cut off an entire branch that has some yellow on it, or be selective with just trimming the yellowest parts of leaves?