🍯 Spring Buildup: Feeding Colonies for Brood Rearing

About this simulation

Early spring is the tightest nutritional window of the beekeeping year. Days lengthen and the queen ramps up laying long before reliable nectar and pollen flows arrive outdoors — so a colony can genuinely starve for protein or energy even while surrounded by blossom that hasn't opened yet, or that a cold snap has shut down. This simulation models a single spring build-up: a hive cutaway with a growing brood nest, an energy reserve fed by syrup and natural nectar, and a protein reserve fed by pollen patties and natural pollen.

How the model works

• Natural forage rises through the spring on its own timetable, but a colder, wetter spring (higher cold-snap severity) delays and dampens that natural curve.
• Energy reserve is topped up by syrup feeding and by whatever natural nectar is flowing; it drains as the colony and brood consume it.
• Protein reserve is topped up by pollen patties and natural pollen; nurse bees convert it into brood food (glandular secretions) for larvae.
• Brood coverage grows toward the comb's capacity, but is capped by whichever reserve is scarcer — Liebig's "law of the minimum" applied to a colony: protein-starved colonies stall even with full syrup jars, and vice versa.
• Adult population follows brood coverage with a lag, echoing the ~21-day gap between an egg being laid and a new worker emerging.

Controls

• Syrup feeding rate — litres of 1:1 sugar syrup supplied per day, stimulating the energy reserve.
• Pollen patty — toggles a protein supplement patty on the top bars, feeding the protein reserve directly.
• Cold-snap severity — how much a cold, wet spring delays and suppresses natural nectar and pollen flows.
• Colony strength — starting frames of bees, setting the comb's realistic brood-rearing capacity.
• Speed — runs the simulated calendar at x1–x12 days per tick, or pauses it. Drag to rotate the camera, scroll to zoom.

Did you know?

UK beekeepers commonly feed thin 1:1 syrup and pollen substitute patties from late winter through April specifically to bridge this gap — not to make honey, but to keep the brood nest fed until hawthorn, oilseed rape and dandelion bring in a reliable natural flow.