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container 2 liters for indoor containers.

I start seeds i pots made from newspaper.  Love the re / up cycle thing.  From there, I used to go into solo cups but then I realized something.  I can get almost as many 2 liter bottles into a tray as I can solo cups.  After experimenting with them, I also learned that they are less prone to root rot if you leave extra water in the tray.  Also, there is plenty of room to grow and to train roots to grow down.  They are not nearly big enough for mature plants, but seem great for starting indoors.  Just drill holes in the bottom and wrap with black duct tape to keep light off the roots.

Anyone else?  What do you use?
 
I start in small polystyrene cups then plastic pots then into a bigger pot then into the final pot.So it goes 8 ounce - 30 ounce-half gallon then into final large pot(8-42 gallon)
 
The reason i started with two liter bottles (top cut off, bottom with holes) if I have children who are addicted to soda.  I hate throwing things away and always want to find a use for a thing.

Thinking half gallon is 64 Oz. and two liter is about 34 ounces.  So cutting a two liter top off probably leaves about a half gallon.  My math is horrible, but think we are comperable.  Curious, how old do you keep them in the half gallons?  No set time for me, when I can get plants outdoors they go outdoors.
 
I too like to reuse/recycle anything I can. My preference is the one quart yogurt containers, almost 2x the volume of a solo cup.
 
Two liters is larger than half a gallon (about 67 oz). Cut in half brings you down to about a quart in volume, would seem to take more room (footprint)  than a solo cup. My peppers grow slow, so they'll be in their second pot (a solo cup or equivalent) for a while until final transplant.
 
Since you asked for opinions: if you're going to use many, wrapping them all in tape (to prevent light) seems like much labor and at least some expense, which goes a bit against the goal of recycling. Where I live, we save such containers separately, everything gets recycled by our town.
 
Another advantage of solo cups over 2-L bottles. They can be washed and neatly stored into each other, so they don't take much room. 2-L bottles don't have the tapered walls and take much more room to store -unless you throw them away at season's end, which seems to defeat the original goal.
 
I used 2-liter bottles once. They were more prone to tipping over than a flat bottom container such as large yogurt container. I didn't notice any issues from the roots being visible, but under a 2 tube shop light with all of the foliage they had I don't think the bottles really had much light directly on them.
 
You must have huge solo cups in Waddy because I can fit a lot more solo cups than 2L bottles in an area, but then my method is direct sewing into a solo cup then replant outside in late spring before they get big enough to need more soil, so I have no need for a larger container inside. 
 
Whatever works for you is the method to keep using but around here there's a recycling program so used 2L bottles get collected and recycled.
 
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