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In Pokemon HeartGold , there's no such thing as a fertilizer, it's just you going to the flower shop and you talking to the girl who's looking at the flowers and talk to her and her giving you mulch. When you go back to the berry pots click on them and it says fertilizer and when you click it will work because you have mulch and click on the mulch and it will do something to the berries.
Fertilizer can be found in the flower shop in goldenrod city, johto region.

Hope I helped!

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14y ago

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