Good idea JohnEmad I saved my 3x3 when I bought my new 4x4x7 and use it for seedlings, vegging. But mine sits outdoors on a screened in patio year round I don't grow out there in winter for flowering it's in the house for the 4x4. I lost a jar of WW this season do to mold, really made me mad at myself cause I think it was on it and I didn't see it when harvested just carried it through the jar cure. Yes leave them open longer, winter is tricky.