All of the flowers that indicate clay should have a common oredict tag, maybe "clayIndicator"

• TFC Version: build 129

Or perhaps a 1.15 tag

"this does really nothing, it's not used by us, it's very unlikely to be used by addons. It's not a tooltip. Also, doesn't help unless you actually find the plant." - Alc

Yeah, no, this is a bastardization of the ore dictionary system for no reason.