Always interesting to hear how people fare with techniques in different climates.
I'll keep that in mind and be watching - it does get very hot in the greenhouse too.
Also going to try that seedling assay, see how the tomato responds, just to make sure there's no herbicide residue.. The stuff I had last year for sure didn't cause a problem, but you never know.
Nice tip about the worms - that's always a good sign to me.
I use raw kelp in my containers too, so I always like to see some worm action happening in the mix.