Puff-shroom

The Puff-shroom is the first mushroom you get, and, although it has an incredibly short range, is free - a good trade-off, since sun is harder to come by at night. They are nearly as effective as Peashooters, but only have a 3 column shooting range. Of course, as a mushroom, they are only awake at night, and their bad range makes the expense of waking them up with a Coffee Bean a waste of sun.

Suburban Almanac Entry
Puff-shroom (Mini Mushroom)

Puff-shrooms are cheap, but can only fire a short distance.

Damage: normal

Range: short

Sleeps during the day

"I only recently became aware of the existence of zombies," says Puff-shroom. "Like many other fungi, I'd just assumed they were fairy tales or movie monsters. This whole experience has been a huge eye-opener for me".

Cost: 0

Recharge: fast

Strategy
Because of their short range, they can only handle basic zombies, unless used in multiple columns, so more effective plants should be added to your defenses mid-level. Another strategy is to fill the stage from column four over, and replace the back ones when you can. These plants can also be used to slow Gargantuars and Giga-Gargantuars in Survival: Endless, due to the free cost allowing players to sacrifice them to force the Gargantuars to stop and smash them. Puff-shrooms work well in conjunction with defensive plants as the Puff-shroom has plenty of time to fire at the zombie before getting eaten. These may also be helpful in ZomBotany and ZomBotany 2, as they are too short for the zombies to hit them with peas, making them a good choice for both attacking and stopping Squash Zombies. However, they need Coffee Beans to be waken up.

One of the most well-balanced defenses for the night levels uses two columns of Puff-shrooms (in columns 3 and 4 from the right, although a third can be added in column two) behind which one or two columns of Fume-shooms are planted. Behind these are planted two rows of Scaredy-shrooms for long range attacking, with a row of Sun-shrooms to produce sun. They can also be used to stop the Pole Vaulting Zombies that come in the early game on the "Night" level when replaying Adventure Mode, but unless you have three columns of them, they still have a chance to get by your Puff-shrooms.

Photosensitive
In order to gain the DS achievement Photosensitive (beat a Night level without collecting any Sun), Puff-shrooms are extremely important. The rest of the selected plants are not important, since you can't plant them. (Wall-nuts and Potato Mines can be used, but you can only plant either one Wall-nut or two Potato Mines.) The easiest level to achieve this is on Level 2-1, as the only zombies that appear are the regular Zombie and the Newspaper Zombie. Simply plant 3 to 4 columns of Puff-shrooms at the back of the lawn. (Do not plant Sunflowers, as you may be tempted to collect Sun, therefore failing this achievement.) Due to their 0 Sun cost, do not worry if the zombies eat your Puff-shrooms. Continue to plant and replace your Puff-shrooms, and you should easily achieve Photosensitive.

Trivia

 * The Puff-shroom, Sun-shroom, Spikeweed and Potato Mine are the only plants that can avoid the peas of the Peashooter Zombie and the Gatling Pea Zombie.
 * However, if they are planted on Flower Pots, the Puff-shroom can be hit by the Peashooter Zombies' and Gatling Pea Zombies' peas due to the added height of the Flower Pot.
 * This does not happen is if you plant it on a Lily Pad.
 * The Puff-shroom has a 3 square range, since it's enough to kill a normal zombie.Puff-shroom.jpg
 * The Puff-shroom and the Sea-shroom are the only plants in the game that cost no sun.
 * A Puff-shroom is too small for a Pumpkin, but when it shoots a spore, the spore passes through the Pumpkin's shell and still damages the zombies. This is .probably because the Pumpkin has holes in it.
 * The Puff-shroom is the smallest plant in the game, apart from the Potato Mine when it is unarmed.
 * The Puff-shroom and the Sun-shroom are the only plants which, when planted, may not be in the centre of a square on the lawn. They may get planted slightly to the left or right.
 * The Puff-shroom, the Fume-shroom, the Gloom-shroom, and the Sea-shroom are the only short-ranged shooters.
 * The Puff-shroom and the Sea-shroom are the only shooters with a 3-column range.
 * The Puff-shroom is one of the two cheapest plants in Versus Mode, requiring only 25 sun for the cost of the Coffee Bean. The other is the Potato Mine.
 * Even if the Puff-shroom is at the edge of the red line in Versus Mode, it cannot shoot the Target Zombies, as the distance is just slightly over three squares long.
 * The only time it can shoot the Target Zombie, however, is if its spore goes past a dead zombie about to fall down.
 * It's weird that the sprout (in Zen Garden) turns into a Puff-shroom even though it does not have any roots.
 * On the iPad version (and possibly on the iPod Touch and iPhone), the spore range increases to 4 squares.
 * Crazy Dave mentions that you're kinda lucky to have the Puff-shroom before Level 2-1.
 * This may be because the Puff-shroom costs no sun since you don't get much in nighttime levels.
 * You can survive Level 2-1 with nothing but Puff-shrooms.
 * There is a very rare glitch where a Zombie will eat the spore that the Puff-shroom shoots and the Zombie mouth will puff up and explode the Zombie's head.
 * The lips look like it's going to kiss.
 * The Puff-shroom is the first mushroom you obtain.
 * It is near impossible to complete a night level without it, even with Sun-shrooms.
 * On the DS version if a Puff-shroom shoots an already dead Zombie (after falling), the spore will pass through the entire lawn, which is weird because it can only shoot to a zombie if it's in a 3 square range.
 * It's weird that most fungi aren't purple and the Puff-shroom and Fume-shroom is purple on top.