I recently started using my old poplite to roast green coffee. Going from offbrand instand coffee to this has been pretty different. I don't know if it's worth the extra effort or money, but it's a nice hobby.
You should grow your own to save the money and increase the hobby.
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I support the cultivation of knowledge about horticulture. Coffee plants are easy to care for and good for many kinds of people just starting out. If your desire is to grow your own coffee beans for the purpose of home-grown coffee, that will also require specific knowledge and skills in horticulture.