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I challenge you to a duel!

Spidermite found your cup
solo cup.png
 
Go the other way, Spidermite . Balance your 50lb bag on one of homegrown's Solo cups. Balance Mr.furley's interesting device on top of your soil. Drop your seed on top. Let the roots grow through the interesting device, through the soil, into the cup. We're not supposed to grow roots out of the cup. Nothing has been said about growing roots into the cup. I mean, roots are supposed to grow into the cup, right? Neither the device nor the bag of soil is a cup. Only a plant support sitting over a Solo cup with too much soil.
I'll put together a big shadow box of oversized stuff for homegrown's cup to sit in to mess up the scale. Make the cup look smaller in it's environment. If we take a picture and make the picture blurry, Bigfoot-walking-through-the-forest-on-8mm-film blurry, Rwise , you would be a champ if you could help us by Photshopping out all the unnecessaries and adding proper blurries. You know, give it some good newts.
Let's get crackin' y'all!'
 
It's made of concrete. Probably no drainage holes and it's not biodegradable. Reusable, but not biodegradable. You can keep it.
 
Ah, the old "Grow an oak tree in a thimble" contest. Hmmm. Sounds like a fertigation situation. A spot of peat moss to get the seed started, fill the rest with perlite, set up an intermittent drip system with feed and drain buckets, put a hole in the bottom of the cup for drainage, then drain the holding tray. Make sure the tray doesn't stay moist and encourage water roots. Timing is everything. Basically, hydroponics with a lot less hydro. Have just the place for it. Now I just hope I can get my seed in time.

I added this for the discussion. Here is what happens to root structure in fertigation when you allow the bottom to dry a bit.


Root Structure 1.jpg
Root Structure 2.jpg
 

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BaccaRacca if you can get it set up perfectly as you described I think that the way will be the hands down winner. If all is perfect I think you could grow a plant that is not limited by the size of the cup. But we shall see.
 
DingusKhan: John Emad nailed it. It's a technique used for potted plants in nurseries. Perlite makes the pots really easy to move around. As Spidermite points out the trick is in the setup. Send too much water/nute solution through the cup and you'll have water roots follow the water out the weep holes, which is against the rules; too hydro. I write from experience on this. As for coattails, ideally, you'll want to let the bottom of the cup to dry out just a bit, without drying out the whole cup. So the proper watering schedule/flow rate is critical. On a large scale, see above for what the technique does to the root structure -- even though this is not a clone there is no tap root.
 
Thank you all, kind gentlemen! That's so cool, I'm going to a couple of different autos for this, and one of them will be fertigated.

I assume the noots drain to waste.
 
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