How to Keep Dahlias Blue

Dahlias are known for their large blooms and rich colors. Dahlias come in variety of colors, including orange, red, yellow and pink. In addition, dahlia varieties can also come in blue. Some dahlia purists argue that blue dahlias are not recognized as true dahlias; however, they are available for purchase at many nurseries. The color on a blue dahlia is striking and is one that many gardeners wish to keep on their flowers as long as possible. In order to keep your dahlias blue, you must give them a bit of care.

Things You'll Need

• Fertilizer

Instructions

1. Plant your dahlias in a location that receives plenty of sun. Dahlias thrive in areas that receive full sun because its rays give them the essential nutrients they need. Without the sun, the flowers can lose their color.

2. Remove any dead buds from the dahlia as soon as you spot them.

3. Fertilize blue dahlias monthly with water soluble fertilizer. Use 2 lbs. of 5-10-10 or 10-10-10 fertilizer for every 100 square feet of garden area. Fertilize the dahlias through the middle of the season, then slack off as the season ends.

4. Test the pH of your soil to ensure that it has the adequate level. Dahlias grow best in soil that has a pH between 6.5 and 7. Collect a small sample of your soil and take it to your local extension for testing. Adjust the pH levels if necessary.

Tips & Warnings

• Water your dahlias only if they have received less than 1 inch of rainfall in a week. Watering too much can lead to rot.

References

• Dahlia Barn: Dahlia Care
• Dahlia: Dahlia Growing Tips
• The American Dahlia Society: Fundamentals of Growing Dahlias