The use of leaves is normally reserved for Indian almond leaves and is more for dropping PH, breeders swear that it helps like a tonic, but then again old fogies in the hobby swear by salt. Stick wit real meds. You have the best there is for him already.
what were you planning on using the banana leaves for? i havent heard of using them for anything before...but, you might try a farmer's market a whole foods type place, or, i suppose you could always order some online...
