well lets say that when they hit a week in veg they should be hearty enough to withstand low humidity. ive grow outside in az and s long as the plant gets watered it should be just fine. some days there were below 10%, silica is a growers best friend in harsher climates but in the later stages. even inside humidity was low and as long as the temp indoors was around 75 my low humidity wasnt a factor my plants were just a healthy as what i have them in now which is 65-52 percent humidity. they wont thrive as much but they will be fine. just a little less vigorous or thick so its better to have it than to not but you should be fine if you dont have a high humidity
Yes 40 to 60% is the ideal range maybe a little higher in the Depending on where your strains come from But when humidity gets under 40% the stoma stops opening and closing which shuts down the breathing of the plant which stalls out the growth. Too high of a humidity does the exact same thing the stoma stops opening and closing and once that happens you began to have problems unless your strains are specific from tropical area also you've just gotten lucky to not have problems with the low humidity. This is a quote from maximum yield.
(Stomata are made up of two cells, known as guard cells, and an opening known as a stoma. This arrangement, when viewed through a microscope, resembles a small mouth. The guard cells, or what can be viewed as “lips,” respond directly to environmental factors, and can swell to close off the stoma, or deflate to open it. This opening and closing regulates the intake or release of carbon dioxide, oxygen, and water vapor.
When the guard cells are deflated, carbon dioxide and oxygen enter the plant through the stoma. Carbon dioxide and water are converted into sugars for nutrients, and oxygen is used for respiration. In addition, oxygen created from photosynthesis is released through these pores. Although plants benefit greatly from this process, it is not without risk. When the guard cells deflate and the stoma is open, the plant becomes vulnerable to water loss. This is especially true in hot, dry environments where a plant can experience significant water loss through the stomata.)
This definition was written in the context of Botany