Not that I would encourage anyone to start seeking plastic trash out–bringing your own cup is always best–if you do happen to find yourself with plastic cups on hand, they make excellent seed starters. Punch holes in the bottom and fill them with soil. They’ll fit really nicely next to each other in one of those shoe-box sized plastic storage containers, and you can keep the box filled with water to make sure the seeds stay moist. I’ve started a lot of plants for my garden this way.
Not that I would encourage anyone to start seeking plastic trash out–bringing your own cup is always best–if you do happen to find yourself with plastic cups on hand, they make excellent seed starters. Punch holes in the bottom and fill them with soil. They’ll fit really nicely next to each other in one of those shoe-box sized plastic storage containers, and you can keep the box filled with water to make sure the seeds stay moist. I’ve started a lot of plants for my garden this way.