Recommended Gardening Books
The following books can be found on the following sites:
Books on Sunflowers
Title: The Sunflower
Author:
Charles Heiser Jr.
Publisher: 
University of Oklahoma Press
First Published:
1976
ISBN: 
N/A
Description:
This is the bible of sunflowers!  A lot of what I know came from this book. It's no longer in print, but you can find it used.  If you only buy one sunflower book, then this is the one.


Title: The Ultimate Sunflower Book
Author:
Lucy Peel
Publisher:
Harper Collins, USA
First Published:
1997
ISBN:
0-06-270212-2 (hardcover)
Description:
Contains information on gardening, cooking, flower arranging, craft, history, and variety lists.  Lots of great pictures!
Title: Secrets of Giant Sunflowers
Author:
Bernard Lavery
Publisher:
Harper Collins, UK
First Published:
1996 (out of print - must buy used)
ISBN:
0-00-412-998-9 (hardcover)
Description:
Tips on growing giant sunflowers from the holder of 15 horticultural world records.


Books on Soil
Title: Rodale's Successful Organic Gardening: Improving the Soil
Author:
Erin Hynes
Publisher:
Rodale Press, USA
First Published:
1994
ISBN:
0-87596-617-9 (hardcover)        0-87956-618-7 (paperback)
Description:
Tips on preparing and maintaining your planting site.
Books on Seed Starting
Title: Rosdale's Successful Organic Gardening: Improving the Soil
Author:
Nancy Bubel
Publisher:
Rodale Press, USA
First Published:
1988
ISBN:
0-87857-747-5 (hardcover)        0-87857-752-1 (paperback)
Description:
Everything you ever wanted to know about seeds.

Books on Pests & Diseases
Title: Rosdale's Complete Garden Problem Solver
Author:
Delilah Smittle
Publisher:
Rodale Press, USA
First Published:
1997
ISBN:
0-87596-774-4 (hardcover)
Description:
Garden pest & disease control.
Books on Growing Giant Plants
Title: How to Grow Giant Vegetables
Author:
Bernard Lavery
Publisher:
Harper Collins, UK
First Published:
1995
ISBN:
0-06-095191-5 (paperback)
Description:
Growing techniques for world record variety plants.

Books on General Gardening
Title: How to Grow vegetables & fruits by the Organic Method
Author:
J.I. Rodale
Publisher:
Rodale Press, USA
First Published:
1961
ISBN:
0-87596-842-2 (renewed 1999)        0-87956-866-9 (previous)
Description:
Old, but good!  One of the most comprehensive guides to gardening.