Gloom-shroom

The Gloom-shroom shoots fumes in all directions, heavily damaging any nearby zombies. It is purchased from Crazy Dave for $7500, and is unlocked during the fog levels. In order to plant it, you must first have an available Fume-shroom to put it on. As it is a mushroom, it sleeps during the day, so a Coffee Bean must be planted on it to use it during the day.

Strategy
The optimal tactic for pool and endless survival levels is to build a 2x3 area of Gloom-shrooms in the right-hand side of the pool, all covered by Pumpkins. These will handle pool zombies as well as those in rows 2 and 5. This strategy has the side effect of leaving zombies in rows 1 and 6 mostly unscathed, so although these can generally be handled with Cob Cannon shells or consumable plants, such as the Jalapeno, a better idea is to put Gloom-shrooms in the fifth and sixth columns in rows 2 and 5, plus using Fume-shrooms in rows 1 and 6 in the fourth and fifth columns. Optionally, Garlic can be placed in rows 1 and 6 to funnel zombies into the Gloom-shroom's line of fire, while Spikeweeds/Spikerocks can be placed in rows 2 and 5.

Another effective use is a row of Gloom-shrooms in rows 2 and 5, with two Garlic at the very end. All land zombies will be moved to rows 1 and 6 and be annihilated. Snorkel Zombies and Dolphin Zombies will make it necessary to add a two colums of Pumpkins on Lily Pads in the pool to allow time for the Gloom-shrooms to destroy them. This strategy is perfect for the Mini-game the Last Stand, since it can handle all of the zombies encountered. Their effectiveness is hampered by their short range, which makes them vulnerable to Gargantuars when planted on land.

Basic Information
After upgrading from the Fume-shroom, the Gloom-shroom becomes even stronger and even better although it isn't really the greatest plant of all. The Gloom-shroom causes normal damage with each shot, and while its range is the surrounding patches in all eight directions, the attacking speed is very fast. Note that they can hit zombies that are eating Wall-nuts on any of the squares in its range, but not Tall-nuts (unless a Pole Vaulting Zombie, Pogo Zombie, or Dolphin Rider Zombie jumps into it). With a proper strategy, you could win the game extremely easily. This plant is essential to surviving any large number of flags Survival: Endless.

The Gloom-shroom does four DPS to any given target in its range, so it does four times as much damage as a Peashooter. Its fumes can also hit every single target in its range, like the Fume-shroom, even if they have screen doors or newspapers. However, again, it does not have as much range.