what i learned on the roof top garden!

I learned that at the roof top garden ,there are alot of vegetables. It is really hard to grow vegetables on the roof top than it is on the ground,because they have to build the garden and carry dirt to the fifth floor.
 The vegetables there are organic ,and  they don't use pesticide.They  use marigolds instead of pesticide to keep bugs away. So, the vegetablews there are healthy. Those vegetables are used for patients from that hospital, and they also sell them at the farmer's market.