I tried infusing olive oil with fresh rosemary and I can't detect the smell of it now (though when it was hardening up the day after it did smell a little like rosemary). I haven't tried bananas but I did do a cinnamon ("pumpkin spice") soap and it smells like pumpkin bread. I infused the OO with cinnamon sticks, cloves, all spice and nutmeg. I hope this helps and have fun with this...it really is addictive.