Why do you think mendel spent so much time observing plants & their offsprings before he began experimenting with them?

I don't know if you mean, like, historically or in relation to the scientific method...

I know he was a monk... (I think it was his job to be the gardener too)

But you're supposed to observe before you can come up with a question that you would then answer through experimentation.

the answer to your question is b