Will clear "pots" work for starting plants

Will clear "pots" work for starting plants, or do they need to be opaque?

I confess to a Diet Coke addiction and I feed my habit with 2L bottles.  I've cut off the cone-shaped tops and flipped them over small pots to make humidity chambers/mini greenhouses, but starting to consider using them to start trees.  I could just try them, but don't really want to waste the months if someone knows if they will work or not.

Guess I could wrap them in something opaque if I need to, so the basic idea will still work, that would just be a bit more fiddling.

I have used them for annuals,  no problem.

William Bronson wrote: I have used them for annuals,  no problem.

Thanks!  Time to start stratifying some tree seeds! :)

The clear bottle should work fine, but there are a few thigs to be careful of. The roots might be damaged by sunlight when the plant gets too big for the pot, so the plants will either have to be repotted in larger pots or planted into the ground, as soon as the roots reach the side of the pots. The other issue is drainage, we use 2 litre milk cartons for plants, occasionally plants in them are overwatered and unable to drain which will start unwanted mold growing on the surface of the soil. This is issue could be resolved by cutting drainage holes in the bottom of the containers.

Yeah, I drill hole sin the bottom for drainage.  Probably a good idea to boost the size of those, or drill more.

I can keep an eye on their growth to watch for roots reaching the edges.  I aim to plant them out as soon as possible, so shouldn't be a problem.  Should have a dog up to deer-prevention size by the time that happens.

I heat a big nail or spike on the stove to make holes in random containers for potting things up