What People Say. 1  David Bush and Jim Parsons Authors, Fair Park Deco Fair Park is one of the finest collections of Deco architecture in the country, but it is so much more: the embodiment of Texan swagger, it is a testament to the Texanic task of creating a dazzling spectacle in the darkest days of the Depression..
Hydrangeas turn blue as a reaction to aluminum in the soil. The soil pH should be slightly acidic (5.2 - 5.5). Do a soil test first, to determine your starting pH. Adding aluminum sulfate to the soil will help lower its pH, if necessary. A word of caution: not all plants can tolerate acidic soil and neighboring plants may be adversely affected.
The medium is a nutrient broth to which 0.5-1.0% sorbitol is added. The pH indicator phenol red is red at neutral pH but turns yellow at pH < 6.8. It also changes to magenta or hot pink at pH >8.4.