High Acidity Soil Improving Our Garden!
10 Jul
Our front yard has lots of thriving plants, mainly roses and bushes of various types, but we noticed that the plants in an area next to our driveway had been struggling.
Last year we planted five large Rhododendron bushes and four Hydrangeas. Our wonderful Mom suggested that the soil might not be acidic enough for the Rhododendrons and Hydrangeas. She gave us a large bag of used coffee grounds which were provided by the excellent “Roots Coffee House” in North Richland Hills.

Used Coffee Grounds Can Increase Soil Acidity
The used coffee grounds can increase the acidity of soil and help plants which need higher acidity. I did some research and found that coffee acidity is the bright and dry taste that adds life to a coffee. The acidity of coffee is similar to the dry but bright sensation experienced while drinking a red wine. The brewing of coffee removes alot of the acids but the discarded coffee grounds are perfect for adding some well needed soil acidity for plants like Rhododendrons and Hydrangeas.
Rhododendrons
Most Rhododendrons prefer acid soils with a pH of roughly 4.5-5.5 and the local Texas soils are probably only a pH level of about 6.9. Adding used coffee grounds to the soil brings the pH down from 6.9 to a lower, more acidic value, which is perfect for the Rhododendrons.
Other advice is that Rhododendrons have fibrous roots and prefer well-drained soils high in organic material. Rhododendrons are often grown in raised beds with a liberal addition of composted pine bark. Mulching and careful watering are also important.

Making High Acidity Soil
Hydrangeas
Hydrangeas can tolerate a range of pH, soil acidity, conditions however for some varieties the color of their flowers is determined by the relative acidity of the soil. A pH below 6 (acidic) will usually produce flower colors closer to true blue, whereas soil with a pH above 6 (more alkaline) will produce flowers that are more pink. The flowers on all of our Hydrangeas were all very pink in color which was another indicator that the soil was not acidic enough. We’re hoping that if we can increase the soil acidity with the used coffee grounds then we will get more blue Hydrangea flowers.

High Acidity Soil for Hydrangeas
We have already noticed an improvement in the look of our Rhododendrons and Hydrangeas and we will be taking advantage of free used coffee grounds from our local coffee houses to keep them looking healthy for years to come.

Our High Acidity Soil























