<span class="link_user">@BigHeadChief</span>, Yes but I don't think the colors come from these differences, it's more a genetic thing. The differences are the following : smaller pots, different nutrients brand, no topping and no LST, auto plants.
<span class="link_user">@GrowerOG</span>, If you click on the text below his picture, it leads to a diary. But the diary doesn't appear on his profile, no idea why, probably another bug on the website.