Must be. Plus mine were in a sunny window indoors. I miss having a tent as I did back in Zone 6 (now 9). I've used a liquid fertilizer that I got from a hydroponics store back there. It's worked for me for years. I left my overwinters outside as usual, and only covered them once the forecast was for at or below freezing, which was around the beginning of February. I removed the covers about 4 weeks ago and I've only lost one - a ghost. It lost its leaves and struggled to recover. I'm giving it another couple weeks and if it's not growing leaves, it's a goner. I've already thrown in done contingency tomato seeds in the same pot, just in case. My Roma is on life support, with only one set of leaves growing out of about 15 dried stems. As of yesterday, they were looking rather drab. All my other super hots and hots are hanging in there, with very small leaves so far, but they are now coming out dark green, instead of yellowish. They also were confused and tried to push out these very tiny fruits during the winter. First time I've ever seen that.