The Texas A & M University Agricultural Extension Service has produced a great resource for growing poinsettias. The information aims specifically at growing conditions in Texas but is very useful for growing poinsettias anywhere.

Topics at the Texas Poinsettia Producers Guide site include:

• Poinsettia History
• Poinsettia Forms and Styles
• Poinsettia Economics and Marketing
• Poinsettia Cultural Characteristics
• Poinsettia Cultivars
• Production Schedule
• Poinsettia Height Control
• Selecting a Poinsettia Growing Medium
• Poinsettia Water Quality
• Poinsettia Irrigation
• Poinsettia Nutrition
• Insect and Mite Management
• Poinsettia Diseases and Control
• Common Poinsettia Disorders
• Conversion Tables for Growers and Gardeners
• Additional Poinsettia References

Read more about Texas Poinsettia Producers Guide.