Is there a difference between Plant Food, Bio-Plant Food, and the Fertilizer Bomb? Are their effects cumulative?

And, when it says, "immature" plants, does that include when they have just been potted? (And are only little mounds of dirt?)

Thanks for your time.

well the food makes your plant look bigger

and the fertilizer makes the flowers grow faster

That's not quite true. The Bio-Organic Plant Food causes plants to produce more flowers. It doesn't affect how fast flowers are produced. The Fertilizer Bomb is a "combination" plant food that affects all plants growing in the greenhouse when it is used. It makes plants grow larger and produce more flowers (just like the description in the game says).

The effects of applying more than one chemical (or more than one dose of the each chemical) are cumulative (to a point - you can determine how many doses works best for you).

I usually apply the various plant food types immediately after I plant the seeds, but it can be done any time before the plants produce buds.

If you cilck on the Fertilizer bomb you will see the instructions say to use on just planted seeds and it also says it will make the plants larger and have more flowers on them. The Plant Food and Bio Plant Food for immature plants means plants that have leaves, but not yet showing their flower buds.