The Science Nook for Kids - This page has a good diagram of a flower with the different parts labeled.

Zoom - An experiment for changing the color of a flower.

Gardening Projects A to Z - Links to other sites for kids related to gardening.

ThinkQuest - What is a Flower? - A diagram and information on the parts of a flower.

The Flower Alphabet Book by Jerry Pallotta.
Go through the alphabet and discover a wealth of information about flowers.

Flower Garden by Eve Bunting.
This popular author offers a wonderful story of a beautiful flower garden.

Fran's Flower by Lisa Bruce.
This silly book tells the story of how a little girl tries to get her flower to grow by feeding it the same types of foods she likes to eat!

From Seed to Sunflower (Lifecycles) by Gerald Legg.
This book has great illustrations and follows the lifecycle of a sunflower seed.

Jack's Garden by Henry Cole.
Similar to the cumulative text of "The House that Jack Built".

One Bean by Anne F. Rockwell.
This book covers the concept of flowering plants bearing fruits or vegetables.

Planting a Rainbow by Lois Ehlert.
Bold illustrations capture all the different colors of flowers. 

The Reason for a Flower (World of Nature) by Ruth Heller.
Ruth Heller's rhyming text offers an explanation of flowers, their seeds, and pollination.

Sunflower House by Eve Bunting.
This popular author tells the story of a young boy planting a circle of sunflowers and creating a "house" for summer play.