I use the old toilet roll middles for starting off seeds - the whole thing, pot and plant, put directly into the soil when they're ready. The toilet roll pots will rot away - sometimes I tear them as I plant out the seedling, usually they're already broken or about ready to disintegrate.
I've read that some people put the toilet roll inners in a microwave for about a minute before they use them, this prevents fungal growth (I think). I've never done that and I've never had a problem with them.
thanks for directing us to that interesting thread - I plan on going back to that site, it looks great, full of info.
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