The first issue to consider when looking at growing coffee
from seed is what exactly are you starting with. There are three
possibilities. One raw fruit, two a raw seed that still has the
silver skin attached or three a processed unroasted green seed.
If you are starting with a green seed that has been processed
for roasting you may have less success than if you are starting
from one of the other two points although I have heard of
success starting from green beans.
In any case most people recommend prewetting the seeds to allow
them to sprout. At this point you can plant the seed at a
moderate depth. It will take several weeks before you see any
evidence of a plant so don’t give up.
Coffee trees grow very slowly especially in a pot so do not be
surprised at the slow rate of progress.
It will take from three to five years before you will see any
fruit and do not be surprised if it does not produce any coffee
you want to drink unless you are extremely lucky and have great
coffee growing soil and a good coffee climate soil.
I am told coffee trees are also available in some nurseries.
You can buy seed from a number of online seed suppliers and some
nurseries may carry seeds or be able to special order them for