I did actually experiment with the toilet paper roll thing - I had these plastic containers that lettuce leaves came in - about 6" wide x 9" long x 6" deep. I filled it with the rolls, then added the seed starting mix & seed.
They were adequate for a couple of weeks, but then the cardboard started to show alot of white mold on the outside - they couldn't dry out - & after that, the plants seemed stressed - longer & lankier than others planted in conventional containers.
I won't bother with it again.
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So Many Tomatoes ... So Little Time
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