Don’t toss that cheap summer kiddie pool just yet. Drill some holes in the bottom and fill it with some yard soil to create a separate raised bed for the young ‘uns where they can experiment to their hearts’ content.
No kiddie pool? No problem. Pots and planters will work equally well, particularly for apartment dwellers and those in colder climates with shorter fall growing seasons, where some plants may need to be moved to protect them from frost. Or simply give the next generation of gardeners their own small section in the garden.