Hello. Two questions here:
#1 The stalks on my tomato plans are very dark. I wouldn’t think twice about it, but the plant that has the darkest stem seems to “wilt” out on me a lot. It recuperates very quickly. With an extra soaking and maybe a little less sunshine. But I was wondering if it might be a precursor to an impending major fail? I’ve also noticed that the bottom leaves are getting brown spots. Any thoughts? Maybe too much nutrient. It just dawned on me that each time I fill my reservoir, I use water that has nutrients in it. Should I be adding fresh water when I make up for evaporation? Or add treated water every time?
Otherwise, the plants are doing beautifully…I think?
#2 Do people separate their columns into plants that need blossoming nutrients and those that don’t? For example, I want my tomato & green bean plant to blossom, but not my lettuce, or cilantro. It seems like those plants should be in separate columns?
Updated entry: Here is a better image of Septoria Leaf Spot from Iowa State U Plant Diagnostic Clinic. Septoria Leaf Spot is another fungal disease that attacks tomato leaves, especially the lower leaves of plants. Like many other tomato leaf diseases, it requires wet leaves for spores to germinate, so avoiding overhead watering can help prevent the disease.