Hoffman 66505 Aluminum Sulfate, 4 Pounds

This works well like any other one.. plus bought for quantity but quality came with is a plus!

I like the ease and that it doesn’t have any ill affects on my plant. I love the violet colors, along with the pinks. I like it better than pure blue, thus I have not added the solution every two weeks as recommended.

It's ok.

No funciona muy bien, sea aplica semanalmente ya que las hortencias tienden a ponerse moradas y a mi me gustan azules, pero no mucho funciona

I bought this to rapidly drop the pH of the soil in the pots I have hydrangeas in. The flowers were pink and newly purchased/planted. I mixed in the "Blue Magic" into a 2 gallon water can and applied to the pots. Within about 2 weeks the flowers began to look a deep purple. I followed the directions and waited the 2 weeks and reapplied. It has been close to a month since I first applied and most of the flowers are dark purple and the small buds are bright blue. I am hoping the new flowers burst out with the beautiful blue flowers hydrangeas are known to produce.+ Inexpensive, large bag+ Works nearly immediately, rapidly drops pH- Very Dusty- Does not dissolve well in water, if it even does at all. It looked like the white powder just settled to the bottom of the watering can._Bottom Line_ Yes, the product seems to be changing the color of my hydrangeas, and served as a quick fix. No, I would not recommend this product to a friend. I have many acid loving plants but it seems the best way (for me) to lower pH is by using alternatives to Aluminum. I did some research after I made the purchase and decided I do not want to spread this stuff on my azaleas and other acid loving plants in the garden. There are many alternatives that are much safer. Overall, I am happy with how quickly the flowers changed color but I will only be using this in small amounts for my container plants.

It worked in a week to turn pink hydrangea (in 4 inches pot) to purple then blue. I used this with Citric acid to make a solution then watered hydrangea once every 2 weeks.( 5 table spoons Aluminum Sulfate : 15 g Citric acid : Water 5 gallons). I recommend this product.

Helps to sit in water for 30 minutes then stir to completely dissolve granules. Very happy with product

Have put it down around our hydrangeas, but since they aren't blooming yet, we don't know if this product is working or not.