I got the ebb & gro system and its been paying the mortgage for yrs.LOL!! just jokin'. You can grow anything in these babies. As you heard above just chng. your controller to match your pots -size - and you can grow "trees" if thats what you want. The yeilds will be there as you work through any kinks that arise. I added 6 to bump up to 18pots and simply placed a cple in organic soil to round off the gro-but legally I can grow 24-so I gotta get another addition. Its the best system out there.I saw a guy make a similar system using 20' lengths of pvc pipe,about 6-8" diameter, capped ends, w/holes cut into sides for planting right there in the tubes of pvc. I guess the roots grow inside but height & size would depend on those roots having alot of grow area to get the height going for the sky. I can talk growing & motorcycles all day so I'll cutoff here -later, gro- peeps