A Univ. of Nev. School of Medicine, Family Medicine answered. No, there are times where you can have small releases of bacteria into your bloodstream that last only a few minutes, for example, after you have your teeth cleaned.
To change the color of your hydrangeas, add the following to the soil: CHANGE TO PINK. For hydrangea blooms to be pink, the plants must not take up aluminum from the soil. If the soil naturally contains aluminum, one must try to keep it away from the hydrangea's system. Following are a few tricks that might work:
Often leaves will yellow due to the transplanting process. The cooler fall temperatures could be sending the plant into dormancy as well. As John suggested, keep the soil damp or moist but not wet. Once the hydrangea has lost it's leaves there won't be as much of a need for supplemental water. If there is long term drought you'll want to provide some water, especially before a serious drop in temperature. During winter, and in the event there is dry soil and temps below 32F, the roots can become freeze dried.