Simply create the following to complete the garden! This stage only has golden star so you only need 1 round of items.

Flower, Plant, Tree, Root, Leaf, Seed, Bush, Weed

Scribblenauts Remix 7-10 Cheats Hints gallery:
7-10-1-a: Help the botanist adorn her garden!
7-10-1-b: Think of different types of trees, bushes, and flowers you find in a garden.
7-10-1-c: The botanist would also like additional landscaping.