This quest expects you to craft the basic terracotta botany pot, however there are additional colored variants made using concrete that have zero benefits other than aesthetics, and I make the ones using purple concrete. Even through I've made a stack of these things, the quest doesn't complete because its expecting specifically the undyed terracotta variant. The hopping pots quest is similar in this regard.

This is a terrible decision. The drawer quests support this, why can't the botany pots quests support this? @Kevin-Marsh