Seed is a slang term for semen. The cover has nothing at all related to plants and instead looks like spy stuff, where you expect a fair bit of sex due to the genre (e.g. Bond girls like Dr. Goodhead or Pussy Galore), which is what tips the interpretation towards sexual innuendo.

Also, it doesn't help that it feels like a reference to some Bond film names that were also sexual innuendo, e.g. the Man with the Golden Gun, where gun also means penis.

I hope this helps your understanding of English, I know how hard it is to learn other languages and you write well enough that I would not have guessed that English was not your first language.

In another comment, someone mentioned that they wouldn't have guessed English is not your native language. But passing as a native speaker is one thing, passing as a good native writer is another.

But I hope you keep writing and keep evolving!