Like Sakuya_Izayoi said hope you watered your plant.. but for real thought If in the course of your game you had not gone back to your plant that it self could be your problem. You have to go back to your berry plant every so often.. more often than not.
I think what happened in your case was you planted it and it probably did grow but in this event the plant will bloom and eventually if not picked will just wither away. Too Bad Soo sad. hope this helps
I only water them once, right after planting. It takes a few hours for them to grow. I use Super Speed when I battle and level grind so I can harvest berries about every 2 real time hours or so I think