Proportion Of Alum To Hydrangeas?

Alum powder, also known as potassium aluminum sulfate, is a popular method to keep cut hydrangeas fresh and hydrated for weeks. By dipping the stems in the powder before placing them in water and refilling the vase, you can prevent wilting and keep the flowers vibrant. Alum can be found in the spice or baking aisle of most grocery stores and can be applied at least two times a year to turn your hydrangeas blue. However, it is important to test your soil to avoid making it too acidic.

A good rate of application to start with is 1 tablespoon of aluminum sulfate. Dipping cut hydrangeas in alum is one of the most popular methods of preventing wilt. Alum acts as a preservative, enhancing the stems’ ability to absorb water, preventing wilting, and keeping the hydrangea blooms vibrant. In general, about 50-150 grams per bush per year is needed. To condition hydrangeas, dip cut stems into alum powder (found at your local drug store and sometimes used to preserve fruits) and place in very cold water.

In summary, using alum powder as a treatment can help keep cut hydrangeas fresh and hydrated for weeks. By dipping the stems in the powder before placing them in water and refilling the vase, you can ensure that your hydrangeas remain vibrant and healthy.