Save empty yogurt cartons to start plant seedlings for your garden in the spring. Empty cardboard egg cartons also work good. So do clear plastic containers from the bakery-mini greenhouses.
I usually find that egg cartons are too shallow and by the time the seeds are growing they have dried out or the roots have grown too quickly. same with old toilet roll insides. Basically not worth the trouble. Better to use a proper seed growing tray and have enough depth for the roots and width not to dry out.
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