Weather events are the free way to mutate crops in Build A Ring Farm, but they’re random — and that’s where sprays come in. Sold from the Gear Shop, sprays let you apply a mutation on demand, so you can guarantee a big multiplier on your best crop instead of waiting for luck. This guide covers every spray, what it costs, and which are worth buying. For how mutations rank overall, see Rainbow vs Cosmic vs Fire.
How sprays work
Each spray corresponds to a mutation: a Rainbow Spray applies the Rainbow mutation, a Frozen Spray applies Frozen, and so on. Using one instantly gives that crop the mutation — no event required. Since a plant only carries one mutation at a time, a spray overwrites whatever was there, so you apply sprays deliberately to lock in a specific multiplier on a chosen crop. That on-demand control is the whole value of sprays versus waiting for weather events.
The spray lineup and costs
According to Pro Game Guides, sprays scale in price with the strength of the mutation they apply. Roughly, from cheapest to most expensive:
- Wet Spray (1.5×) — around $10M. Cheap, good for early experimenting.
- Frozen Spray (1.75×) — around $750M.
- Autumn Spray (2×) — around $850M.
- Void Spray (2.25×) — around $1B.
- Radioactive Spray (3×) — around $10B.
- Rainbow Spray (5×) — around $1T. The best practical choice.
- Cosmic Spray (8×) — roughly 25T cash plus 25,000 Plant Tokens. Premium.
Prices climb steeply, which is the key consideration: a spray is only worth it if the crop it’s going on earns enough to justify the cost.
The Acid Spray — your reset button
One spray doesn’t add a mutation at all: the Acid Spray removes one, for around $1M. It’s cheap and genuinely useful — if a crop catches a weak mutation you don’t want, or you want to clear a plant before applying a better spray, Acid Spray resets it. It’s also one of the rewards from the BARF:3 code, so you may get one for free.
Which sprays are actually worth buying?
- Rainbow Spray (5×) is the sweet spot for most players: a guaranteed strong mutation you can place exactly where you want it. If you buy one premium spray, make it this.
- Cheap sprays (Wet, Frozen) are fine early for experimenting, but their low multipliers rarely justify the habit once you’re earning real money.
- Cosmic and Fire sprays are endgame-only. At trillions-plus, reserve them for a single showcase crop on the Outer ring where a 8–10× multiplier produces the biggest harvest possible.
When to use sprays vs wait for events
The efficient approach combines both: catch cheap mutations free from events while you play, and spend on sprays only to guarantee a top mutation on a high-value crop at a moment that matters — like right before a long offline stretch, so the boosted crop banks big while you’re away. Never spray a low-value crop; a Rainbow Spray on a Carrot is money wasted. Match the spray’s cost to the crop’s earning power.
Sprays vs pets for mutations
Sprays aren’t the only way to guarantee mutations — certain pets push crops toward higher mutations automatically, for free, once equipped. So before sinking trillions into Cosmic or Fire sprays repeatedly, consider whether a mutation-upgrade pet like Kitsune (see the best pets tier list) covers your farm more cheaply over time. The ideal endgame uses both: pets handling baseline mutation upgrades across the farm, and a single premium spray reserved for guaranteeing a top mutation on your one showcase crop. Sprays are precision; pets are coverage.
Getting the most from the Gear Shop
Treat the Gear Shop as a precision tool, not an everyday purchase. Save up, identify your single best crop, put it on the Outer ring, and apply the strongest spray you can afford — then let mutation-upgrade pets and events handle the rest of your farm for free. Before any big spray purchase, run the crop-plus-mutation combo through the calculator to confirm the harvest justifies the spend. Used surgically, sprays turn a good farm into a great one; used carelessly, they’re the fastest way to burn cash in the game.