Is it OK to repurpose plastic glasses as seedling containers for the mid-phase between initial development in trays, and final planting in the garden?
(I am going to make holes with a cigarette at the bottom of the each glass; this is the cheapest solution that I know)
The glasses are available in sizes 200-500 ml.
EDIT: I read (see, for example, this question and this question) that light affects microlife in soil, and even that root can think it is a branch (!), so transparent or semi-transparent glasses would be in that sense unsuitable, but I hope, since this is only temporary, this won't have significant impact.