Are you looking to add a pop of colour to your garden? Hydrangeas are a stunning choice, but did you know you can actually change the colour of their blooms? If you have blue or pink hydrangeas and want to switch things up, aluminum sulphate is your best friend!
Understanding Hydrangea Colours
The colour of hydrangea blooms largely depends on the pH level of the soil. In acidic soils (pH below 6), you’ll typically see beautiful blue blooms. In alkaline soils (pH above 6), your hydrangeas will be a lovely pink. By adjusting the soil pH, you can shift the colour of your hydrangeas!
Using Aluminum Sulphate
Step 1: Test Your Soil pH Before you start, it’s crucial to know your soil’s current pH. You can purchase a soil pH test kit at a local garden centre or online.
Step 2: Determine Your Desired Colour
- To achieve blue blooms: Aim for a soil pH of 5.5 or lower.
- To maintain or achieve pink blooms: Keep your soil pH above 6.5.
Step 3: Apply Aluminum Sulphate To make the soil more acidic:
- Mix 1 cup of aluminum sulphate per gallon of water.
- Water your hydrangeas with this solution.
- Repeat every few weeks until you see a change.
Step 4: Monitor Soil pH Keep an eye on the soil pH. You may need to reapply aluminum sulphate throughout the growing season to maintain the desired acidity.
Tips for Success
- Watering: Make sure to water your hydrangeas regularly, especially after applying aluminum sulphate.
- Patience: It may take several weeks to notice a colour change, so be patient!
- Mulching: Use mulch to help retain soil moisture and regulate pH.
Final Thoughts
Changing the colour of your hydrangeas is a fun way to customize your garden’s aesthetic. With a little effort and the right soil amendments, you can enjoy a stunning array of colours. Happy gardening!
For all your gardening needs, including aluminum sullphate and more, visit Peterborough Landscape Supply today!