8 Ways to Use Coffee Grounds in a Garden

A great many of us use coffee in the morning to get us going. If you use a coffee pot to brew your coffee then you have grounds left over. You can use them in your garden to help in many different ways. Below are listed some of the uses we have found for coffee grounds. So review the list with a great cup and let us know what you think.

1. Grow Mushrooms
Why buy store bought when you can grow your own mushrooms? All you need is a bucket, a lot of coffee grounds, and Oyster mushroom spores. Check it out here: mushroom farm. It does take a lot of grounds to grow them; one good source is to ask for leftovers at a coffee shop. They’ll be more than happy to supply you with them.

2. Grow Blue Hydrangeas
Add grounds to the soil and it will help your hydrangeas grow a vibrant blue. This is because coffee grounds add acidity; this helps the plant absorb aluminum, which makes the flower blue.

3. Keep Pests Out of Your Garden
You may enjoy waking up to the smell of coffee, but pets (especially cats) don’t find the odor so great. Simply sprinkle some coffee grounds around where you don’t want pets to tread. If slugs and snails are your garden pests, sprinkle coffee grounds as a barrier. As the grounds dry it will create a barrier that slugs will not crawl over.

4. Speed Up Compost
When making compost, don’t forget to add coffee grounds. Some people actually use the grounds in compost piles in place of manure. Especially with high-carbon items like leaves and straw, it actually speeds up the composting process. Coffee is a good source of nitrogen for compost and the pH of grounds is pretty close to neutral.
How to layer coffee grounds in compost: 1/3 leaves, 1/3 fresh grass clippings and 1/3 coffee grounds. That easy! For more information on check out this file from Oregon State University: Coffee Grounds and Composting.

5. Repel bugs And Mosquitoes
While you’re outside enjoying the summer evening, set out bowls of coffee grounds to keep bugs away. You can even sprinkle the grounds around your sitting areas to keep mosquitoes away. They will even repel your neighbor’s cat, too. Read more here: Best Natural Mosquito Repellents for Your Home.

6. Feed The Worms
Worms love coffee grounds! Scientists think it is because they need something gritty in them in order to aid digestion. Either way, it’s a good gardening tip. Whether you already have worms or want to attract more of them, get out the coffee grounds and feed the worms.

7. Fortify Plants
This article on How to Use Recycled Coffee Grounds offers details on how using coffee on plants can help them grow better. Using compost made from coffee works wonders, as it contains nitrogen and all plants need this important nutrient, especially lettuce, spinach, broccoli, cauliflower, kale, and brussels sprouts.
You can also add grounds to the soil for a better soil structure. Be aware that stronger coffee can be more acidic. But, when you use recycled or used coffee grounds most of the acid has left the grounds and is in the coffee. Try using additional nitrogen fertilizer with coffee grounds. The grounds boost microorganisms in the soil to break down the coffee. This process will also use nitrogen in the soil, so it’s a good idea to add a little nitrogen.

8. Plant Carrot Seeds
Carrot seeds are so small they can easily be washed out with rain and clump together. As the carrots grow, this can lead to overcrowding and crooked roots. An easy fix is to mix the seeds with dried coffee grounds, sand or fine vermiculite. The seed to coffee grounds mixture should be in equal ratios. Read more from Cornell University: growing carrots.


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