Kratky hydroponics lettuce jar on a UK windowsill
Posted inHydroponics & Indoor Grow

Beginner Kratky Hydroponics: Lettuce Jar Setup

No pumps, no noise. A simple jar method to grow crisp lettuce indoors under LED lights—perfect for UK windowsills.

What you need

  • Wide‑mouth jar + net pot
  • Hydro nutrients
  • Rockwool cube
  • LED light (optional)

Steps

  1. Germinate lettuce in rockwool.
  2. Mix nutrients; fill jar leaving air gap.
  3. Insert net pot; place by bright window.
  4. Harvest in 4–6 weeks.