This Web Quest directly addresses the Virginia Science Standards of Learning for First and Second Grades. Because it is difficult to find reading material for this age, I have written a lot of it myself. However, you might want to have the students pair up with students in upper grades to allow them to research the plants in more depth. The older students could also help plant and design the class garden. That garden had to begin somewhere, usually in the mind of the gardener.
Every garden is different and special.
The final goal is to plant a class garden. You may need some help getting it started. Here are some sites that offer good suggestions. Also, check out the sites listed in the References section. A gardener must learn about the plants to make a garden that will grow well and look beautiful.