Thank you for replying!
I have ferru in my collection of crops, and they look like this in the Sphax texture pack, and Aurelia comes with a slightly more golden shade on the "leaves".
It's highly unlikely to be redwheat, but I've laid down a redstone torch nearby anyway. I agree, it might be just the plant taking its own sweet time . I didn't know that that amount of time is possible for coffee bean plants to mature, so thank you so much for that piece of information! Cheers!