Espoma Organic Soil Acidifier, 6 lb Bag – Lowers Soil pH for Hydrangeas, Blueberries, Azaleas & Acid-Loving Plants

If you're growing blueberries or other acid-loving plants like Hydrangeas, a little soil acidifier will help them grow very well. Hydrangeas will turn to a blue color in acidic soil, otherwise they will remain pink. Blueberries won't survive in alkaline soil.

Excellent value and price. You cannot find this size bag cheaper anywhere else, I would love if you could also carry the 30lb bags as I have to buy so much of this for my hydrangea garden.

Kinda dusty, but the Wife likes her hydrangeas to be blue (not pink). This stuff keeps her happy. Happy wife = happy life. Basically just adding to stuff to order to get "free" shipping.

I bought this for my blueberry plants and since using it the blueberries have put out a great amount of new growth and are looking so much healthier.

This stuff makes a real pretty flowers but remember this acid it is only for the flowers But even flower children can enjoy

This is the best for keeping my hydrangeas blue!! Walmart has the best price I've found.

great for blueberry bushes

HALF the price of the hardware store! Makes the hydrangeas bright blue. This stuff is great.

If you need acidifier for your plant - this is it! My little one feel great with it!

It is definitely a slow acting long-term solution to acidify soil. That's also the main reason it's difficult to gauge it's effectiveness. I have found it to have a beneficial effect on my blueberry bushes without risk of damage if used appropriately.