Flush: Mushroom Cultivation

Mushroom cultivation calc + grow tracker. Stamets, Cotter, Cornell BMP citations on every default. Free for oyster, lion's mane, shiitake. Pay $6.99 once for Pro.

Pay once for Pro. No subscription, no ads, no account. Works offline.

Flush is the iOS calculator and grow tracker for gourmet and medicinal mushroom cultivation. Enter substrate weight, pick a species, and get hydration math, sterilization protocols, biological efficiency forecasts, and per-flush yield predictions. Named-source citations on every default — Stamets's Growing Gourmet & Medicinal Mushrooms, Cotter's Organic Mushroom Farming and Mycoremediation, Cornell Small Farms' Northeast Mushroom Project, Field & Forest plug-spawn standards, and peer-reviewed studies in Journal of Fungi and PLOS One.

Hard scope: gourmet and medicinal edible species only. Oyster, lion's mane, shiitake, king oyster, reishi, maitake, pioppino, enoki, chestnut, turkey tail, and cordyceps militaris. Flush does not support, reference, or instruct on psilocybin or any controlled substance.

Why named-source citations matter: practitioner trust depends on tracing every default — sterilization PSI/time, biological efficiency range, fruiting CO₂ ppm, spawn-to-bulk ratio — to a source you can verify yourself. Flush surfaces "Per Stamets:", "Per Cornell BMP:", "Per Field & Forest:" on every numeric default, with a Sources tab linking to the original references.

Features • Hydration calculator: HWP, CVG, straw, Masters Mix, supp. sawdust, Wu '93 shiitake — exact water-to-add math, squeeze-test guidance • Grain spawn: rye, millet, wheat, sorghum, popcorn — per-grain hydration %, soak time, sterilization PSI / time, jar fill • Agar recipes: MEA, PDA, DFA (Cotter's Dog Food Agar shortcut) — scale to any volume • Liquid culture: 4% LME, honey, corn syrup — with downstream inoculation rates • Sterilization matrix: PSI / time / method per substrate • Biological efficiency forecast: per-species BE range × dry weight → lifetime yield with first-flush and per-flush decrement curves • Plug spawn for logs: Cornell BMP geometry + Field & Forest 50-plug standard + Hericium 80-plug exception • Eleven species library: oyster, lion's mane, shiitake, king oyster, reishi (kidney-cap vs antler CO₂ targets), maitake, pioppino, enoki, chestnut, turkey tail, cordyceps militaris — each with colonization and fruiting temp/RH/CO₂/BE/casing rules and citation lineage • Brand presets: Field & Forest, North Spore, Mushroom Mountain, Out-Grow • Multi-grow tracker: log substrate batches, readings (temp, RH, CO₂), events (inoculation, shake-break, fruiting init, FAE adjust, contamination), per-flush harvests with auto-computed BE • Sources tab: named-source attribution with direct links • Universal app for iPhone and iPad

For home and small-farm growers using PF Tek, monotub, shotgun fruiting chamber, Martha tents, agar work, grain-to-grain transfers, liquid culture, and outdoor logs.

Free download with the hydration calculator, BE formula, three species (oyster, lion's mane, shiitake), and one active grow. $6.99 one-time unlocks Flush Pro permanently: Masters Mix and supp. sawdust calculators, agar, liquid culture, grain spawn protocol, the expanded eight-species library, reishi's inverted CO₂ kidney-cap vs antler target, plug spawn for logs, multi-flush yield tracker, unlimited grows, and brand-aware preset detail. 48-hour trial starts when you first tap a Pro feature.

Privacy: Flush collects nothing. No analytics, no accounts, no network requests. Your grows live on your device.

Like calculators with citations? Look up Press (hard cider), Crust (pizza dough), Trace (cold-process soap), Splash (chlorine pools), and Hide (leatherworking) by the same developer.