Congratulations.

You watched the grass grow.

This is real Bermuda grass biology, slowed down. Full mow-to-seed cycle: ~4–8 weeks in the real world, compressed here to 4–20 hours.

How this simulation is modeled

Bermudagrass (Cynodon dactylon) is a warm-season grass that, left unmowed, reaches roughly 15–24 inches tall before topping out with finger-like seed heads. In a maintained lawn it is cut to 1–2 inches (0.5–1.5 in for hybrids) and mowed once or twice a week. In ideal summer conditions it can push close to 1 inch of growth per day.

The plant on screen scales to about one-sixth of your screen height at full maturity, moving through the true Bermuda stages: post-mow recovery → vegetative growth → stem elongation → seed-head emergence → seed maturity. Each plant is assigned a random real-time lifespan between 4 and 20 hours, and its age is saved in your browser — so it keeps growing whether the tab is open or not.

A sense of scale

Fresh mow: ~2 in tall (day 0)
Vegetative growth: ~1 in/day in peak summer
Seed heads emerge: ~4 weeks after establishment
Viable seed: ~8 weeks
Peak season: ~85% of yearly growth falls between May 15 & Sept 15

So watching a full real cycle would take the better part of two months. You are getting the express version.

Weather

The sky follows your device's real local time — blue with drifting clouds by day, moon and stars by night. Rain is modeled on a Florida summer, where the rainy season runs ~May 15 – Oct 15 with afternoon and evening thunderstorms on the majority of days (80+ thunderstorm days a year). Expect frequent showers, weighted toward the afternoon.

Sources

University of Florida IFAS Extension — Bermudagrass for Florida Lawns (ENH19/LH007). ask.ifas.ufl.edu
University of Missouri Extension — Bermudagrass (G4620). extension.missouri.edu
NOAA / National Weather Service, Tampa Bay — Florida Thunderstorm / Rainy Season. weather.gov
Florida Climate Center, Florida State University — Thunderstorms. climatecenter.fsu.edu

Figures are drawn from the cooperative-extension and government sources above and rounded for a general audience. This is an art toy, not agronomic advice.

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