Grow a Garden is a slot machine wearing a gardening costume, and the mutation system is the reels. There's nothing wrong with that, plenty of good games are dressed-up slot machines, but if you're going to keep pulling the lever you should at least know what the lever pays on average. Because the roll everyone chases is not the roll that funds the farm.
The reels and their payouts
From our mutation guide, the multipliers land roughly like this: Gold around 20×, Rainbow around 50×, and event-only mutations like Shocked at about 100× and Frozen at about 10×, each rolling at its own rate every harvest. Big numbers. The 50× and 100× are what people screenshot. Hold that thought, because the screenshot and the income are different stories.
Expected value is the only number that predicts your income
The figure that actually forecasts your sheckles per hour isn't the jackpot, it's the expected value of a harvest: the base value multiplied by the sum of (probability × multiplier) across every mutation that can roll. That weighted average is what you earn on a typical plot over a typical hour. The jackpot is what you earn on the rare lucky plot, and you can't pay rent in rare plots.
Why the boring roll wins
Run the rough numbers. A Gold roll at, say, a 5% rate and a 20× multiplier contributes about 1.0× to your average all by itself (0.05 × 20). A Rainbow at a 0.5% rate and 50× contributes about 0.25×. The unglamorous Gold roll is doing four times as much for your actual income as the Rainbow you're praying for, because at these rates frequency beats magnitude and it isn't close.
That's the whole lesson in one line: the Rainbow feels like the goal, but the Gold is the business. Chasing Rainbows by re-rolling and fussing over individual plots is usually negative expected value compared to just harvesting more volume and banking the Gold-rate income. The mutation-odds calculator will show you the probability of hitting a target mutation across N harvests, and the honest takeaway is almost always "less often than it feels."
Crop choice beats luck
Here's the lever that actually moves your earnings, and it's not luck at all. Because every mutation is a multiplier on the crop's base value, a high-ceiling crop makes every roll worth more. The top of our crop tier list — Celestial Orchid, Starfruit — earns more on an ordinary Gold roll than a low-tier crop does on a great one. Better base value on a worse mutation beats a better mutation on a worse crop, almost every time. Pick the crop deliberately and the dice matter less.
Events are when the table changes
Event mutations like Shocked at 100× temporarily warp the expected value hard in your favor while the event runs. That's the window to farm aggressively, because the math is briefly, genuinely good. The off-season is for steady volume on a high-ceiling crop, and the event is for going wide while the 100× is on the board. Treat the calendar as part of the strategy.
So optimize for harvests per hour on a crop with a high base, run hard during events, and treat any Rainbow or Shocked as a pleasant surprise rather than a plan. The mutation that makes you money is the common one you collect a hundred times, not the rare one you'll remember. Farm for the average and let the jackpots be jackpots.