Is the gloom shroom worth it?

The gloom shroom is one of the strongest plants in the game. It is absolutely worth the price.

Pros:

• Extremely high DPS (4 hits per second)
• Hits ALL zombies in range, even full stacks
• Hits through papers, screen doors, and ladders
• Can attack zones behind it and in adjacent rows

Cons:

• Expensive (even more so during the day as you'll need coffee bean)
• Short range

If you plan 2 of them in rows 2 and 5, you can take out the majority of the zombies without issue. You can supplement them with garlic to force zombies to move to a different row in order to protect your gloom shrooms better. In the long run this costs you way less sun than having an equivalent amount of defense. This also leaves you way more space to plant more suns or other defensive plants (like magnets, etc).

The short range is also mitigated by plating nuts in the other lanes to hold the zombies while the gloom shroom kills them.

The gloom shroom is so good that even with the additional cost of coffee bean its worthwhile to use during the day. During night levels they're a no brainer.