Mod Dependencies

I'd like to know if it's possible to make two mods and then have one of those mods use elements from the first one.

For example, I make a mod about flowers and then I make a mod about dyes. Would it be possible to make a recipe in mod two (dyes) using the flowers from mod one (flowers). I know you could just make it in the same mod for that example but it's only an example.

Any ideas?