You must obtain the berry first. And plant them as normal as any other berry.
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You have to wait for it to grow.
Mulch
Plant them in the soil where you picked them and water them. If they dont grow then maybe your internal battery has run dry (this means clock based events like shoal cave tide and plants wont grow)
it takes about 1-3 days to grow
Once you have the Berry Grow thing, you can plant the Oran Berries into it. It may take awhile though, like a couple of hours.