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GardenCopilot guides

Practical knowledge for growing food indoors.

Clear, usable methods for small-space food growing — starting with what I learned growing cherry tomatoes and cucumbers in my software office. Each guide explains what it can tell you, and what it can't.

  • Cherry tomatoes
  • Lighting & costs
  • Free calculator

Start with these guides

2 published guides · more as the experiments produce data

A truss of ripe red cherry tomatoes hanging from a plant indoors
One cherry tomato truss, in the office · 23 July 2026
Cherry tomatoes

How to count tomato trusses and estimate your yield

Count fruit trusses stem by stem, then turn the count into a clearly labelled estimate — without mistaking it for a real harvest.

You'll learn

  • How to count trusses on main stems and side shoots
  • How to work out a hypothetical yield estimate
  • Why an estimate is not a measured harvest weight
Read guide : How to count tomato trusses and estimate your yield
Lighting & costs

How much does a grow light cost to run?

Understand how much electricity a grow light uses and what it costs per month — and the mistakes that make estimates wrong.

You'll learn

  • The formula from watts to kWh to monthly cost
  • A worked example you can follow
  • How to find a light's real power draw
Read guide : How much does a grow light cost to run?
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Grow-light electricity cost calculator

Enter your light's watts, hours per day, days per month and electricity price. It shows the daily and monthly kWh, the monthly and yearly cost, and the formula it used.

Open the calculator