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How big in plug trays?

Jim Duffy seems like a smart cookie.  Saw a photo or video of him putting plug trays out last spring.  The plants were at least a foot tall.  I was amazed.  Just how big can plants get in plug trays before shading each other to death or not having enough root room? 

To figure this out, I decided to see this year but the experiment isnt over.  Have a tray that I am leaving in the 72 cell plug tray till they look sickly.  At about a foot, they do look leggy but not sickly.
 
Of mine?  I will get some tonight when wife is back with phone.  For Jim Duffy, check out his facebook page.  I am sure I saw them there.  They were absolutely amazing.  Never thought that would work.  Pondering spacing in grow room.
 
AJ Drew said:
Of mine?  I will get some tonight when wife is back with phone.  For Jim Duffy, check out his facebook page.  I am sure I saw them there.  They were absolutely amazing.  Never thought that would work.  Pondering spacing in grow room.
My plants a few years ago got to about 8 to 12 inches high in solo cups before they got root bound, roots grew through and plugged the drainage holes.

You should check out the ping pong ball grow challenge of you haven't seen it.
 
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