Used Coffee Grounds are Great for Your Garden!

Don't throw away your used coffee grounds - they are great for your garden!

Cool them and then pop them straight out into the garden or mix in with compost.

Coffee is nutrient rich

Containing valuable nitrogen, potassium, and phosphorus - the nutrients plants love - coffee makes a wonderful green material that is great for your garden.

When you add spent coffee grounds to your compost heap, you're giving your soil a genuine nutrient boost. The coffee grounds break down to release nitrogen, potassium, and phosphorus, the three macronutrients that plants rely on most. Coffee grounds also improve the texture of your soil, helping with aeration, drainage, and water retention all at once.

For best results, keep grounds to around 20% of your total compost volume so the pile doesn't become too dense, and balance them with "brown" materials like dry leaves, straw, or shredded paper. Make sure the heap stays well-aerated, and if you use unbleached paper filters, those can go straight in too.

Once your compost is mature, it's particularly well suited to acid-loving and nutrient-hungry plants — think azaleas, blueberries, hydrangeas, and roses.

But personally, I just make my coffee, and then head out to the garden where I sprinkle it over a different patch each time. Just don't put on the layer too thickly. About one spoon's worth of sprinkles are fine.

Coffee grounds are a great pest repellent!

There's an extra bonus to adding used coffee grounds to your garden in the form of a natural pest repellent.

As a bonus, the gritty texture and strong scent of coffee grounds naturally deter slugs, snails, and ants, so your garden gets a little extra protection along the way.

Balcony/window box that love coffee grounds

If you don't have a garden, don't worry.

Used coffee grounds are also great for a compact balcony or window box. You can use them if you grow:

• blueberries (they love acidity and do brilliantly in pots).

• strawberries

• tomatoes

• ferns for a shaded spot

• and herbs like rosemary and basil.

  
  

If you have a larger container, hydrangeas work well too — the grounds can actually intensify their blue colour.

When you shouldn't use them

But be careful. DO NOT put them around lavender, geraniums, and succulents, which prefer alkaline conditions.

Can you use used coffee grounds on house plants?

Good question — yes, some houseplants too, but you have to be more careful indoors. Here's the honest picture:

Because coffee grounds hold moisture, in a pot with less airflow than a garden, there's a danger that the extra moisture can encourage mould and fungus gnats pretty quickly. So for houseplants the safest approach is:

• Mix a very small amount into the potting soil when repotting rather than sprinkling on top

• Or use cooled leftover brewed coffee (very diluted) as an occasional liquid feed instead — less risky than grounds directly

  
  

Avoid entirely for:

• Cacti and succulents

• Orchids

• Most tropical foliage plants that like neutral to alkaline soil

Houseplants that can benefit:

• African violets — like slightly acidic conditions

• Jade plants — tolerate grounds well

• Pothos — fairly forgiving and responds to the nitrogen

• Spider plants — can handle a light application

• Peace lilies — do okay with very small amounts

Eco-friendly

Keeping coffee waste out of landfill reduces organic methane emissions — a small but meaningful win.

Not only will your coffee ground compost be kind to your pocket (you've already paid for your coffee, so you might as well enjoy every last drop, right, and not have to fork out on another packet of soil improver for your plants). Keeping coffee waste out of local landfills helps reduce organic methane emissions. So, it's win-win!

Kindness in every cup — right to the last ground

It's not just about the coffee tasting good (though we do work very hard on that). It's about every choice along the way — for the land, for the people who tend it, and for the planet we all share. That's why we think that the Blesséd Brew coffee can bring kindness in every cup - even down to the last used coffee ground!

If you'd like to try the coffee behind the compost, you can shop our single-estate South Indian Arabica at theblessedbrew.com.

If you're already saving your grounds for the garden, we'd love to hear about it — drop a comment below and tell us what you're growing.

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