Could be that it has not been inplemented
Linked issues
Comments 2
Resolving as a duplicate of MC-29505 in favor of the better description.
MC-29438
New flowers and grasses don't fit into flower pots(bug?)
Resolved
Duplicate
0
Paul
(Unassigned)
Unconfirmed
Minecraft 13w36a
Retrieved
Confirmed, poppy and dandelion placed on a vase need a block update to show. New flowers behave fine.