SteelThumb

Seed-to-table automation for home gardens

If AI is going to change the world, it should at least help us grow dinner.

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Backyard grow bags before SteelThumb digital-twin overlaySame backyard garden with SteelThumb digital-twin planning and telemetry overlay
Drag to compare the real garden with the SteelThumb planning layer.

The Idea

More food, less work.

The question is simple: can I use AI coding agents to dramatically increase the output of my garden without increasing the amount of work for me and my family?

Constraints

  1. Self-hosted and local-first.
  2. Open source software and hardware where practical.
  3. Repairable and reproducible at home.
  4. No required subscription to control your garden.

How SteelThumb works

Human-led. Agent-assisted. Seed to table.

System map showing gardener, agents, SteelThumb UI, Tendril, water pump, seed, garden, and table meals connected in a seed-to-table loop.
The app does not replace the gardener. It gives the gardener and their agents a shared map, memory, and control surface.

Grow Kit

Grow bags and irrigation are the base system.

The first layer is practical: containers, lines, emitters, and a layout the app can understand. SteelThumb starts with a grow kit that makes the garden easier to place, water, inspect, and expand.

Grow bags with irrigation shown as a forward and reverse looping garden clip
Grow bags and irrigation form the physical base layer.
bagsGrow bags

Flexible growing volume for yards, patios, side lots, and temporary beds.

waterIrrigation system

Drip lines and emitters turn watering from a daily chore into a repeatable loop.

mapKnown layout

Each bag, row, and line can become part of the garden record.

PlotTags

Physical addresses for the garden.

PlotTags turn grow bags, drip irrigation, beds, reservoirs, and devices into camera-readable locations the app and agents can reason about.

TLDR: AprilTags are basically QR codes for robots and machine vision nerds. SteelThumb uses them to give real garden parts stable visual IDs; open source printable models are coming soon.

SteelThumb UI

The local-first garden dashboard.

SteelThumb UI turns the garden into a working record: weather, observations, plot plans, device state, and the logs that explain what changed.

WeatherLogsPlotsMCP
Backyard weatherRealtime weather dashboard for the garden with temperature, humidity, rainfall, and wind readings.

Realtime weather dashboard for my garden.

Plot planning
TomatoesBed A · trellis
GreensBed C · partial shade
HerbsGrowbag row
Garden log

Watered growbag row · photo added · harvest note saved

Next: check reservoir and thin basil starts

MCP server

Chat with the garden record from your local chatbot or agent.

ask: what needs water today?

Water Pump

Tap or chat to see water move.

The watering loop connects a clear command in the app to physical flow at the garden, with visible state so the user can tell what is running.

App commandGrowbag row

Reservoir 68% · pump ready

Garden responseWater running

Flow active · stop from the app or local control.

Garden response with water running through the irrigation line.

Tendril

Open hardware for garden sensing.

Tendril is the battery-powered garden monitor and automation hub: temperature, humidity, water level, camera, and local app connectivity in a repairable field node.

Early Tendril open hardware prototype
Early Tendril prototype
  1. Temperature + humidity

    Track growing conditions where the plants actually are.

  2. Water level sensing

    Know when the reservoir is low before watering fails.

  3. Camera view

    Capture visual context for growth, pests, and maintenance.

  4. Battery powered

    Designed for field placement without a permanent outlet.

Roadmap

Closing more of the loop.

The long-term direction is practical home food infrastructure: start plants, tend them, harvest them, feed the soil, and preserve the ability to learn and repeat what works.

01In-home greenhouse automation

Steadier starts, hardening-off, and weekly propagation indoors.

02Robotic harvesting

Selective help for repeat harvest crops when timing matters.

03Compost systems

Turn garden and kitchen waste into measured soil inputs.

04Seed preservation + plant propagation

Save what performed, restart it, and keep the garden cycle local.

Try it out

Grow Real Things

If you've made it this far and you think this sounds interesting, please answer some quick questions and I'll reach out soon.

LFG!