[quote=@Webmaster]
<Snipped quote by Balance>

I'm sorry Mr. Soren, but what does that mean?
[/quote]

It's like how you need a variety of foods to grow. You can make some of the materials you need yourself, in your own body, but getting extra boosts helps you a lot. Fertilisers provide extra boosts of nutrients; some chemicals can even get the plant to grow faster just because.