Bloom and Doom Seed Co.

The Bloom and Doom Seed Co. is the company that manufactures the plants used by the player. Although there is never any major reference to this in-game, the tops of the seed packets have "Bloom and Doom Seed Co." written on them. It is possible Bloom and Doom Seed Co. may be part of a larger company, because at the end of the credits song it says Bloom and Doom records.

Trivia

 * The Imitater's Seed Packet only says "Bloom & Doom."
 * The forest background, made up of pine trees, can also be seen outside the window of the Zen Garden.
 * It is apparent that Bloom and Doom Seed Co. also specializes in non-plants (e.g. Spikerock, mushrooms) that do not grow from seeds.
 * A theory is Dr. Zomboss could have possibly been fired from Bloom & Doom Seed Co., but took some seed packets with him, which might explain why the Zombies carry them.
 * Or the Zombies could have worked there when they were alive.
 * Or maybe the zombies steal them.
 * It may be possible that "Bloom & Doom Seed Co." both specializes in plants and zombies. As the name intitles: Bloom (Plants) & Doom (Zombies), because they also say that in the I, Zombie levels.
 * It is possible that it means that their Plants do damage, since Peashooters shoot peas, Cabbage-pults launch cabbages, etc.
 * In Zombies on Your Lawn music video, it says "Bloom and Doom Records".
 * Just like ZomBotany, it is one of the original names of the game before it was published, without the "Seed" and the "Co." suffix.