I do both. GD is helps in the family garden as it benefits the family, but she has had her own space since she was three. Her plot at the time was planted in strawberries which was easy for her to learn the difference between weeds and plants.
She has requested a larger garden this year and has already started her own notebook where she has made a garden plan and selected what will be grown.
A garden teaches many important lessons. They learn to plan goals, gain an appreciation of working together on larger projects,developing a skill set that will serve them well as adults and most importantly, give them an opportunity to learn the rewards of delayed gratificacation.
I could go buy strawberries at the store any time GD wants them and sometimes I do. GD knows that she can have ones shipped thousands of miles, or she can have ones that she has weeded, watered, covered, and uncovered and worked for.
She also knows she can plunk down amongst her own berries and eat them right then and there, berries warmed by the morning sun, berries so sweet and juicy they burst in you mouth and the juice runs down your chin. Something to be said for delayed gratification.
I declare to you that woman must not depend upon the protection of man, but must be taught to protect herself, and there I take my stand. ~Susan B. Anthony