In order to get more space for growing arugula in the Tower Garden, I decided to purchase full block of rockwool and cut my own.  I found some at htgsupply.com.  (I also purchased from them a single-bulb, t5 fixture to replace one of my fixtures that went out.)

August 11, 2015

The rockwool slab

The rockwool slab

Used a new, very clean blade to cut out the rockwool the size of a net pot.

Used a new, very clean blade to cut out the rockwool the size of a net pot.

The air supply into the Tower Garden can't be blocked off, so I cut a hole out of the bottom of the net pot.

The air supply into the Tower Garden can’t be blocked off, so I cut a hole out of the bottom of the net pot. (Hopefully this doesn’t cause any complications.)

The hole is for a straw to allow air into the Tower Garden

The hole is for a straw to allow air into the Tower Garden

Thanks to Joe of Level2 Concepts for the straw idea.

I poked about 13 holes in each rockwool and planted 2 Burpee arugula seeds in each hole.

I poked about 13 holes in each rockwool and planted 2 Burpee arugula seeds in each hole.

August 13, 2015

Placed the arugula seedlings in the Tower Garden

Placed the arugula seedlings in the Tower Garden

August 15, 2015

Arugula in the Tower Garden Cut your own rockwool

August 23, 2015

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August 29, 2015

Cut Your Own Rockwool - Arugula in the Tower Garden

Sept 6, 2015
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Sept 13, 2015
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October 25, 2015

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After 2 months and 2 weeks, I harvested 11.2 ounces of arugula.  This was in the Tower Garden a lot longer than I would like.  The arugula gets very strong with age.  So if you like it spicy, let it grow.  🙂

I’m going to experiment more with cutting my own rockwool, but on a shorter time-frame to better compare.