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'A plant fertilizer spread on soft soil. it speeds up the growth of berries. However, it also dries the soil faster.'
i got like 8 berries+ using this fertilizer, but make you you don't forget to water them. Never let the soil dry out. If that happens, then the amount of berries will decrease.
but i think its different for every berry.
i got 8 on certain ones and 5 for others. I grew them next to each other, same mulch and watered exactly the same.