Well, I think it is but some other growers in this forum may say otherwise. I recently ran some GDP that stayed nice and healthy green all through flowering but usually I expect to see some leaves turn yellow and then brown and dry up. Cannabis is an annual plant, which means Nature never intended it to live more than one growing season. Most annual plants die after going to seed or releasing pollen. On top of that, most growers cut back on fertilizing as the harvest approaches, so that is likely to show up as yellowing or browning leaves. Less nitrogen, less chlorophyll.