May 28, 2024

VIDEO: Easy to Grow Hydroponic Lettuce Using the Kratky Method


This video shows how to grow lettuce in glass mason jars hydroponically, meaning in water instead of in soil. I use the Kratky method, which does not need an air pump. A simple glass jar is good enough to grow the lettuce as you will see. The seeds sprout very quickly, and in just 5 weeks I have a beautiful harvest! After another 2 weeks the leaves grow back and I am able to harvest a second time! Very delicious both times!
You can find the items I use in this video on Amazon here:
Grow Lights: https://amzn.to/2syY5r5
Nutrients: Grow Big by Fox Farms: https://amzn.to/2YwJpqe
Or Masterblend Formula: https://amzn.to/2WfjZNo
Rockwool Cubes: http://amzn.to/2puNhZ6
Clay Pebbles: http://amzn.to/2G0AcOf
Mason Jars (make sure they are wide mouth): http://amzn.to/2GeoN0E
Net Cups 3 inch: https://amzn.to/2SpJlFD

29 thoughts on “VIDEO: Easy to Grow Hydroponic Lettuce Using the Kratky Method

  1. It’s been 3 weeks and my seedlings are tall and spindly but no roots are coming out of the bottom of the rock wool cubes. A couple have their first set of true leaves. Suggestions?

  2. Hmmm…. I think a redesign in the self-watering soda bottle planter would come into play here….

    No more soil and water wick.

    Putting lots of holes so the roots can go through.

    Once the plant has been transplanted, put small stones or pebbles for stability.

    Add enough water and cover the outside to prevent algae.

  3. Thanks again for another very informative video.
    One question, do you refill the jars for second and third harvest with plain water or still add the fertilizer?

  4. Just a heads up to save potential money with this. Make sure to get the widest lip net cup you can. The regular mouthed Mason jars are too big for the cheap Amazon net cups and fall through. There are some made by CZ Garden on Amazon that are perfect! Wish I would have known before but all is well now love the videos again, thank you!

  5. Can you recommend a different fertilizer/food? The ones you recommend are not available on Amazon. Are you looking for any specific ratio in the fertilizer? Thanks!

  6. Hi Tikki! I couldn’t tell if the rockwool was touching the bottom of the net cup or if there were clay pebbles on the bottom first. Would you please let me know? Thanks so much for all your videos, love from Ontario Canada!

  7. Mine was growing good, but never got any roots show thru before falling over from being too skinny in the rockwool. Help what went wrong?

  8. Hi Tikki

    Enjoy your informative vids. Am starting my lettuce hyrponics from watching yours!

    Can you please do a vid on lights, when to put them on? from seeds? And how far apart?

    Thank you

  9. I've tried this above, but when I plant the seed in the rockwool in the plastic container, I just get algae and no sprouting! What am I doing wrong?

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