We've seen a lot of reports of Plantera's Bulb not spawning, but when we look into the player's games and maps, we can see Plantera's Bulb is there, but the jungle has not been explored enough to find Plantera's Bulbs.
Plantera's Bulbs usually start to spawn in the lower reaches of the Jungle and can take as many as 30 minutes to begin spawning in your game. Bulbs can be identified on the map as bright pink squares but they can be tricky to find! Make sure you have a lot of torches lighting up the jungle to help spot them quickly!
Read up more about Plantera's Bulbs and how to find them on the Official Terraria Wiki!
If you've fully explored the whole jungle and are still having trouble locating a Bulb, please let us know and ensure you send in the .wld world file from your device so we can investigate further.