(photographer - unknown)
How to Turn Your Hydrangeas Blue? Here are a few tips from Proven Winners:
Nikko Blue Hydrangea from Missouri Botanical garden
1. Be sure you’re working with the right kind of hydrangea. You must have a Hydrangea macrophylla or H. serrata to have pink or blue flowers.
Soil pH must be low or acid (5.2-5.5) for the plant to absorb the aluminum.
from nely.bluehortensia blogspot.com
3. Color changes need time to take effect. Consistent treatment is necessary to turn your hydrangeas blue:
- Plant your hydrangeas in a phosphorous-free medium, and use a phosphorus-free fertilizer with lots of potassium (i.e. 25-5-30).
PHOTO BY DEBORAH SILVER - CHECK OUT HER GREAT WEBSITE- http://deborahsilver.com/
- Drench with aluminum sulfate immediately after planting. A solution of ½ oz (1 Tbsp) per gallon is a good start. Be sure the plants are well-watered before applying the aluminum sulfate as it can burn the roots. (important!!!) Drench again in 10-14 days.
- Alternatively, you may apply a controlled-release form of aluminum sulfate. Products such as Blue-Knight® will release aluminum sulfate over a three month period. This is safer.
Some varieties shift to blue more easily than others. Here are NEW varieties which produce blue flowers more easily than others:
(Cityline have tight sturdy stems and these maintenance free plants require no pruning for more flowers in the coming summer. Intense colors will "pop" in your garden. The flowers age quite nicely into fall as well.)
Cityline Berlin Hydrangea by Benkes Blog
Let’s Dance® Starlight*
Let’s Dance® Rhapsody Blue*
Let’s Dance® Diva!*
Tuff Stuff™ *
Tiny Tuff Stuff™ *
*Denotes reblooming varieties.