Hydrangeas and roses grow ‘bigger blooms’ with kitchen scrap - hydrangeas even turn blue

Hydrangeas and roses
-Credit: (Image: Getty)


Hydrangeas and roses dazzle with their spectacular blooms, but achieving this requires gardeners to pay close attention to the plants' needs.

The key to nurturing hydrangea and rose plants is fertilising. This is because it ensures they get the essential nutrients for those eye-catching blossoms that are much loved.

Among a plethora of fertilisers tailored for hydrangeas and roses, coffee grounds have piqued the interest of many green-fingered enthusiasts as a means to enhance their blooms.

Gardening buffs suggest that coffee grounds can significantly boost the bloom quality of your hydrangeas and roses.

Luci Nunes, seeking advice on the matter, posted on the Gardening Hints and Tips Facebook page: "Hi can anyone clear a doubt for me please? Someone has said to use coffee grounds to get nice blooms from hydrangeas and roses and to get blue hydrangeas. Can I use instant coffee granules? ", reports the Express.

Using coffee grounds in garden beds
Using coffee grounds in garden beds -Credit:Getty

Fellow group members were swift to share their insights in the comments, with the majority advising against her suggestion. Eileen Austin clarified: "No. It needs to be ground coffee. A lot of coffee shops give away the spent grounds, but not all."

Clare Wilson shared her experience: "I use finished Tassimo pods and Dolce Gusto pods to keep getting bigger and better blooms from roses and hydrangeas. It keeps slugs and snails away from my plants too.

"I empty them all into a container then yes just sprinkle around the base of plants. But until they dry out don't put a lid on the container or they go mouldy". Meanwhile Karen Davis remarked: "Only add used coffee grounds to your plants. I found that they turned my pink hydrangeas blue. I love it."

Experts at PlantIn explain coffee grounds are nutrient-rich, containing minerals like magnesium, calcium, phosphorus, nitrogen, and potassium. Notably, nitrogen assists in photosynthesis, promoting faster plant growth, while phosphorus and potassium help increase yields.

Instant coffee granules
Coffee can help your flowers -Credit:Getty

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In addition, coffee grounds offer antioxidant and antimicrobial properties beneficial to plants' nutritional needs. However, fresh coffee grounds, those not used for brewing coffee, are overly acidic and therefore unsuitable.

Being mildly acidic themselves, coffee grounds suit acid-loving plants such as hydrangeas, and even nutrient-demanding flowers like roses. Though gardeners looking to utilise these benefits should moderate usage on individual plants.

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