Enter your clone's genome and farm conditions to get exact grow times, harvests per hour and output per cycle.
Grow time in Rust depends on four things: the plant's gene string, its current light level, water saturation and ambient temperature. The Grow Calculator combines all four to give you exact times in minutes for each stage transition — so you know precisely when to clone, harvest or replant.
Each G gene reduces total grow time by ~30% (capped at three Gs). Each Y gene increases yield but doesn't speed up growth. Each H gene reduces the penalty when light or water dips below 100%. Conditions matter most when they're not at 100% — a plant at 70% water grows ~25% slower than the same plant fully watered.
Run electric ceiling lights and a sprinkler-fed planter and your plants will run at 100% conditions 24/7. If you can't afford the power, glow plants alone keep light at ~70% — usable but slower. The calculator above lets you simulate different setups so you can see exactly how much time you save by upgrading.
A GGGYYY clone with average conditions still beats a plain GYWXGY clone with perfect conditions. If you only have time for one optimisation, breed god clones first. Use the God Clone Planner to find your shortest route to GGGYYY, then come back here to time your harvests.