I borrowed the ebook of Grow Cook Eat by Willi Galloway from the public library. So far the most useful factoid is that mustard green seeds can be planted when the soil temperature reaches 45°F. According to Oklahoma Mesonet we are there now. In the fall, the book says to plant when temperatures stay in the 70s in daytime. I assume that means air temperature. That may be a little harder but we can try!
My experience has been that all greens prefer cool weather. Wonder if the book meant wait till the temp stays 45° or above? Damping off may be why i wait till i can plant outside in pots to transplant when big enough. Good luck🤞🏽
My experience is greens like cooler weather. Good luck