Mr. Nonoy tells you to watch the sky. Rain and a storm can put a rare mutation on fruit. The game description also says to discover rare fruits. Neither source lists every mutation name or a sell multiplier.
Three names showed up in play:
- Rainbow. A rainbow mango was sold. The sell prompt was much higher than a pile of small plain fruit. That single sale is not a multiplier you can reuse.
- Golden. Katala's card grouped golden fruit with rainbow fruit and special weather. The tutorial itself only promises a rare mutation from rain and storms.
- Ash. An Abo event announcement played, and a langka was then ash. That event is not the same sentence as the rain-and-storm line. No schedule was shown. See Abo.
Settings includes a weather option. Leave it on if you want those events. Turning graphics off, which the game page suggests when the game lags, is separate from the weather toggle.
There is no mutation calculator on this site. A multiplier that was never printed should not be typed in as if it were a game constant. If you want arithmetic, use the harvest calculator with the peso figures on your own sell prompt.
Mutated fruit still has to be fully grown before you harvest it. The planting steps do not change.