After looking around I couldn't find any planters that had a picket fence on it. So instead, I designed this planter very quickly in tinkercad. Its default size is 80mmx80mmx50mm so there is plenty of room to scale it larger. The one i printed in the image attached is scaled roughly 150%. There is 5 drainage holes in the bottom as well (not shown in image)
Picket_fence_planter.stl |