To naturally make hydrangea blue , one must focus on adjust the pH layer of the soil . Hydrangeas typically produce blue flush in acidic soil with a pH of 5.5 or lower . While there are various methods to achieve this , using Al sulfate is one of the easy and most effective way to acidify the soil .

2 . prefer the Right Hydrangea Variety : It is significant to notice that not all hydrangea salmagundi can change color . Only sure types , such as Hydrangea macrophylla or mophead hydrangeas , have the ability to shift their flower colouring material based on stain pH. Therefore , it is advisable to select a puritanic - flowering hydrangea variety if you take for blue flush .

4 . organize the Soil : Before adding the aluminum sulfate , secure that the soil is adequately prepared . Loosen the soil around the hydrangea works using a garden forking or spade to meliorate drainage . This step is particularly important if your grease tends to be heavy or clay - ground , as it can stymy the engrossment of nutrients .

5 . Applying Aluminum Sulfate : Sprinkle the recommended amount of aluminum sulphate around the stem of the hydrangea industrial plant . Be careful not to let the granules directly extend to the plant ’s stem or foliage , as it may cause incinerate . Afterward , gently water the orbit to help the chemical compound melt and penetrate the soil .

6 . Monitoring the pH : It is substantive to continuously monitor the pH level of the soil to ascertain it remain within the desired reach . Regularly quiz the soil every few months or whenever you distrust a pH imbalance . Adjustments may be necessary over time , as the issue of aluminum sulphate can diminish over a stop of months or years .

7 . Organic Acidifiers : If you prefer to avoid using chemical substance compounds like aluminum sulphate , there are natural alternatives useable . Organic acidifiers , such as umber ground , citrus Robert Peel , vinegar , or pine needles , can be add to the soil to gradually turn down the pH. While these method acting may take longer to show results , they furnish a more organic approach .

Remember , adjusting the soil pH is a gradual process , and it may take several month to see a noticeable variety in bloom colour . Additionally , other ingredient like sun exposure and plant wellness can also influence the intensity of the dreary color . Pay attention to the specific needs of your hydrangea mixture and make adaption accordingly .

Personal Experience : I have successfully transmute hydrangea from pink to blue by using aluminum sulphate . My garden had alkaline soil , which result in pink blooms . After conducting a stain test and find the pH point , I applied aluminum sulfate as directed . Over time , the hydrangea started producing beautiful blue flowers , create a vivacious display in my garden . It was a rewarding experience to see the transformation and enjoy the desired colour change naturally .

Caroline Bates