Planning a school garden can be a lot of fun. It is a great place to learn-by-doing. Teachers, parents and students should help to plan the garden. The following are some things to think about as you plan your school garden.

Choose a Site. Of course you want a site with sun, good soil and drainage and probably most important of all, close to water. If your site is on school grounds there are probably outside faucets available. Have your school janitor check to make sure they are working.
If your school does not have any green space, you may choose a site on a nearby vacant lot. You may have to check with your local city official to get permission to garden on the lot. Finding water can be a problem for a vacant lot garden. Many towns will allow you to access a nearby fire hydrant for water.
Involve everybody as you make decisions about the garden. Choose what flowers and vegetables to plant and where they will be planted. Remember, this is ""your"" garden.
Don’t get overwhelmed with things to do in the garden. Take breaks between activities.
Make sure you know what you are to do in the garden and the time required for each garden visit. Visit your garden at least one-to-two times a week to care for your plants.
Grow veggies and flowers you like. Look through garden catalogs and cut out favorite vegetables and flowers.
Start with crops that mature quickly such as: lettuce, radishes, sunflowers, spinach, bush beans and zucchini.
If your school doesn’t have space outdoors, green onions, radishes, lettuce and herbs can be grown in a sunny window in plastic pots or a heavy duty ziploc-quart or gallon freezer bag.
Everybody should have their own space in the garden. A 4 x 4 foot area is a nice size to begin with or at least have a space for your classroom.
Don’t let adults do everything for you in the garden. Direct the kids without doing. You can do most garden tasks with gentle guidance from adults. Do it yourself!
Eat the food you grow. Have a salad party or help prepare a recipe using ""your"" vegetables.
Create a journal of your gardening experience. A journal could contain a map of the garden; what seeds were planted; what the weather was; pictures of what flowers were grown; who visited the garden; bees, bugs, birds & butterflies that were seen in the garden; and photos of the vegetables that were harvested.
Visit your garden as often as possible. Recruit your parents and other students to work on Saturdays in the garden with you.
Plant extra vegetables and flowers for the unwelcome visitors.
Ask nearby neighbors and local police to keep an eye on the garden.
Plan a gathering space in the garden for everybody to gather for gardening activities such as work days or a harvest festival.
(Source: google.com)