I checked the PH before I planted and it was 7ish....but that was with one of those cheap PH testers so who knows how accurate that reading is. I did inoculate the roots with mycorrhizal fungi on planting out. It certainly has been brisk at night the last week or so (mid 40's).....so that could certainly be a factor. But considering the tomatoes in the other box (cherry tomatoes) and the ones planted in the ground don't seem to be affected I'm not so sure.
There are quite a few tomatoes on the plants already......some golf ball sized already. I do worry about overwatering......and I'm not refilling the reservoir as fast as I did last year allowing things to dry out a bit, but by design you shouldn't be able to overwater these SIPs as the wicking properties are more dependent on the amount of soil media that is in contact with the reservoir (between the landscape piping) and not the amount of water in the reservoir.
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