Grow Food Indoors, Guided by Plant Science

Grams of seed per 10x20 tray for 18 microgreens, from Johnny's trial data and Utah State Extension, plus how to scale to any container.

Seedlings need 14–16 hours of light and a dark night. Here is how light intensity changes the hours, with crop targets and a timer schedule.

How to grow microgreens without soil on hemp, jute or coir mats: trial results, seed rates, when to feed, step-by-step setup and food safety.

Change hydroponic water about every 2 weeks in small recirculating systems. Schedules by system, warning signs and a step-by-step change routine.

When hydroponic plants need cal-mag, how to spot calcium or magnesium shortages, and how much calcium nitrate or Epsom salt to add.

Fluorescent tubes 2–4 inches, LEDs higher: extension-backed grow light distance for seedlings, the PPFD behind it, and how to adjust the height.