Is It Smart To Grow Microgreens Without Soil?

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An Epic Gardening reader who grows microgreens recently emailed me and let me in on a little experiment he was conducting.  You see, he’s always been into growing microgreens hydroponically, but wanted to test and see if there were better ways to grow microgreens.  So he set up an experiment.

His name is Darko, and he lives in Slovenia.  He’s been growing microgreens for quite a while now and is very experienced.  I love his experimental nature though…and the results of this test are pretty incredible!

If you want to contact him directly about this experiment, email him at darko@aeiforia.si.

Enter Darko!

Experiment Details

Start Date: 10/26/13 6.45 PM

I was using plastic containers measuring 3.9×7 inches (10×18 cm). One was filled with special soil for herbs, second with cellulose pulp (sulfite hardwood cellulose pH below 6.5) and third vermiculite.  In each tray, I used cress seeds.

Sowing Seeds

Soil: 0.16oz of cress seeds.  Yield was 0.96 ounces of cress microgreens after 4 days.

Cellulose: 0.13oz of cress seeds.  Still waiting to harvest.

Vermiculite: 0.15oz of cress seeds.  Still waiting to harvest.

Watering

All containers were watered from the side.

Soil: pH 5.5 pure water (for pH down I used 24% nitric acid)

Cellulose: Cellulose does not need watering because there is a high water retention which is in my opinion the main reason for slow growing.

Vermiculite: pH 5,5 water with basic hydroponic fertilizer from GH

Thoughts on Growing Media

Soil: I noticed a bit of mold on the soil. Maybe I should remove cover after 1st day, or maybe I should use peroxide on soil also.

Cellulose is too moist and seeds having a problem getting roots in to it.

Vermiculite should be mixed with perlite.  Also should test a mixture of soil and vermiculite and of course also other seeds.

The result?  Soil wins for now.

Side By Side Results

Day 1
Day 1
Day 2
Day 2
Day 3
Day 3
Day 4
Day 4
Day 5
Day 5

Soil Results By Day

Day One
Soil Day One
Day Two
Soil Day Two
Day Three
Soil Day Three
Day Four
Soil Day Four

Cellulose Results By Day

cress-cellulose-day-one
Cellulose Day One
cress-cellulose-day-two
Cellulose Day Two
cress-cellulose-day-three
Cellulose Day Three
cress-cellulose-day-four
Cellulose Day Four

Vermiculite Results By Day

cress-vermiculite-day-one
Vermiculite Day One
cress-vermiculite-day-two
Vermiculite Day Two
cress-vermiculite-day-three
Vermiculite Day Three
cress-vermiculite-day-four
Vermiculite Day Four

Liked this experiment?  Leave a comment!  There are more experiments coming soon as well, so stay tuned.


The Green Thumbs Behind This Article:

Kevin Espiritu
Founder

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