Hydroponic pak choi: fast Asian greens at home
Pak choi is a productive leafy crop for DWC and NFT. Baby varieties fit indoor systems better and can be harvested before thick roots and broad leaves crowd neighbours.
The short version
Pak choi is a productive leafy crop for DWC and NFT. Baby varieties fit indoor systems better and can be harvested before thick roots and broad leaves crowd neighbours. The useful test is not whether a method can work, but whether it keeps the roots supplied with water, dissolved nutrients and oxygen while the leaves receive enough light.
- Select compact cultivars.
- Keep the growing point dry.
- Watch for tip damage on fast growth.
A practical way to do it
- 1
Sow one or two seeds per plug.
Make this change deliberately, then observe the plant and system before changing the next variable. That separation makes the result useful.
- 2
Thin to the strongest plant.
Make this change deliberately, then observe the plant and system before changing the next variable. That separation makes the result useful.
- 3
Increase spacing as rosettes broaden.
Make this change deliberately, then observe the plant and system before changing the next variable. That separation makes the result useful.
- 4
Harvest baby heads cleanly at the base.
Make this change deliberately, then observe the plant and system before changing the next variable. That separation makes the result useful.
What to watch
Look at the whole system before diagnosing a single leaf. Check new and old growth separately, lift the lid to inspect root colour and texture, confirm that water or air is moving, and compare today’s readings with the last entry in your log.
Full-size varieties can overwhelm a countertop garden designed for herbs.
Make the setup easier to live with
Put inspection points where you can reach them without moving plants. Label cables, nutrient bottles and measuring tools. A waterproof tray, a marked full-water line and a simple notebook prevent more trouble than an elaborate controller. When a crop finishes, remove roots promptly and clean the parts you can now reach.
Questions people ask
What is the simplest way to act on this guide?
Sow one or two seeds per plug.
What is the most common mistake?
Full-size varieties can overwhelm a countertop garden designed for herbs.
What should I record?
Write down dates, water volume, nutrient dose, pH and EC readings where relevant, plus one photograph. A short record makes patterns much easier to diagnose.
Sources
Checked 10 November 2026. Product labels and local conditions take precedence.
- Hydroponics gardening — Royal Horticultural Society
- Electrical conductivity and pH guide for hydroponics — Oklahoma State University Extension
- Lighting for indoor plants and starting seeds — University of Minnesota Extension