Gloom-shroom

The Gloom-shroom shoots Fumes in all directions, heavily damaging all zombies nearby. It is purchased from Crazy Dave for $7500 and is an upgrade for the Fume-shroom.

Suburban Almanac Entry
Gloom-shroom

Gloom-shrooms release heavy fumes in an area around themselves.

Must be planted on Fume-shrooms

"I've always enjoyed releasing heavy fumes," says Gloom Shroom. "I know a lot of people aren't cool with that. They say it's rude or that it smells bad. All I can say is, would you rather have your brains eaten by zombies?"

Cost: 150

Recharge: very slow

Overview
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-nut 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 beat the level extremely easily. This plant is essential to surviving any large number of flags in Survival: Endless.

The Gloom-shroom does four DPS (damage per second) 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 shields. However, again, it does not have as much range.

Strategy
One tactic for Pool and Survival: Endless 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, Garlics can be placed in rows 1 and 6 to funnel zombies into the Gloom-shroom's line of fire (although this obviously won't work against Gargantuars and Zombonis, while a Spikeweed/Spikerock can be placed in rows 2 and 5.

Another effective use is a row of Gloom-shrooms in rows 2 and 5, with two Garlics at the very end. All land zombies will be moved to rows 1 and 6 and be annihilated. Snorkel Zombies and Dolphin Rider 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 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 which will cause them to be smashed.

They can also be used in Survival: Endless (in the column second furthest to the left, on land) in order to dispose of Digger Zombies (and Imps), as there is generally not enough room for Split Pea.

Trivia

 * The Gloom-shroom is the only plant that looks up as opposed to the left, right, or at the screen (not including the Cob Cannon while firing).
 * The Gloom-shroom is the only mushroom upgrade since the Gold Magnet isn't considered a mushroom because it is diurnal.
 * Living up to its name, the Gloom-shroom has a constant sad expression.
 * Despite the Gloom-shroom having a constant sad expression, its seed box in the Suburban Almanac in the PC and DS version shows a picture of it like it's smiling.
 * The Gloom-shroom is one of the two plants having its eyes on its mushroom cap, the other one being the Doom-shroom.
 * The Gloom-shroom, the Doom-shroom, the Fume-shroom, and the Ice-shroom are the only mushrooms that frown.
 * The Gloom-shroom, the Starfruit, the Cattail, the Cob Cannon, and the Threepeater are the only plants that can fire outside the lane it is planted on.
 * The Gloom-shroom and the Doom-shroom are the only mushrooms that don't have a design on its mushroom cap.
 * The Gloom-shroom has the shortest range of fire, only one square around itself (not including instant kills such as the Chomper).
 * For some reason, the Gloom-shroom knows when to fire its fumes even though its eyes are facing upward.
 * There is a glitch on the DS version where the Gloom-shroom will puff non-stop on zombies even though the puffing animation shows only four puffs at a time.
 * The Gloom-shroom will still only deal 4 puffs worth of damage, even though it puffs continuously.
 * If a Fume-shroom's fumes hit the Gloom-shroom, the latter's attack rate will increase so long as the former keeps hitting. (Maybe I don't understand what it means, but I tried what I understood and it is untrue that the Fume-shroom enhances the Gloom-shroom)
 * Gloom-Shroom's name was spelled in its Suburban Almanac entry without the dash between "Gloom" and "Shroom."
 * The Gloom-shroom is the strongest AOE projectile plant.
 * It is the projectile plant with the shortest range.
 * Like the Spikerock the Gloom-shroom do one out of four per fume.