Are Old Coffee Grounds Good for Plants?

Are Old Coffee Grounds Good for Plants 2

Are Old Coffee Grounds Good for Plants? Coffee is the most widely consumed beverage on the planet, with 400 billion cups consumed every year. But, with so many people drinking coffee, what happens to the leftover coffee grounds, which are normally discarded?


As you may have suspected, the grounds can benefit plants, but this article will explain when this is the case and when it is not. The benefits and drawbacks of utilizing leftover coffee grounds in your garden are listed below:



  1. It helps to nourish your garden.

After several years of planting, the plants absorb the nutrients from the soil, leaving the soil devoid of critical nutrients for plant growth. Thus, coffee grounds are employed because they contain various important nutrients that aid in the growth of many plants, including nitrogen, calcium, potassium, iron, phosphorus, magnesium, and chromium. The interesting thing about these nutrients is that they aid in forming new cells, which then organize into plant tissue. Growth and survival would be impossible without these nutrients.


Coffee grounds also aid in the retention and aeration of the soil. Old coffee grounds also support microorganisms that promote plant growth and attract earthworms, which improve soil nutrient cycling and organic matter turnover. Other applications include naturally repelling slugs and snails because they dislike the taste of caffeine.


  1. Use as compost.

Decomposing waste plants and food typically make compost, but composting old coffee grounds is a brilliant idea. As previously stated, these grounds add nitrogen to the compost pile, increasing its value. However, the proportion of grounds should be between 10-15% of the total compost. Plants use nitrogen to promote leaf growth and green color.


Compost made with coffee grounds is more nutrient-dense than compost made solely from waste. Compost also contains clippings, leaves, bark, shredded newspaper, herbs, eggshells, stale bread, and fruit and vegetable remnants. Meat, fish scraps, dairy products, diseased plants, grease, and oils should all be avoided in compost.

Coffee grounds reduce your compost’s greenhouse gas emissions.


  1. Insect and pest repellent.

Old coffee grounds are good at deterring mosquitos, fruit flies, beetles due to the certain compounds found in coffee, such as caffeine and diterpenes, which can be highly toxic for plants.


To keep pests away from your plants, scatter coffee grounds around them. They create a barrier that slugs and snails dislike crawling over. You can also keep a bowl of grounds in your garden for pest repelling.


  1. Grow mushrooms

Mushrooms are extremely tough to cultivate since they only bloom under particular climatic conditions. They do not grow in a typical garden because they require an underlying layer or substrate. Coffee grounds are an excellent substrate for mushrooms because they are high in essential nutrients for their growth.

The fact that they are already sterilized throughout the brewing process is an added advantage. Otherwise, it would take longer.


  1. Used as a mulch

Coffee grounds can be used protective layer around your plants to protect from rotting vegetables and reduce evaporation and soil erosion.


DRAWBACKS: but are coffee grounds that great for your plants!??

Because we do not know how much caffeine is used in coffee brewing, the amount of caffeine might be harmful to some plants because they are more sensitive than others.


Caffeine should not be applied to seedlings since they are particularly sensitive and may prevent germination and growth. This might be the primary reason for avoiding mulching the garden only with coffee grounds since it could be quite hazardous to delicate plants.


Coffee grinds should not be put on some soil types, such as clay soil, since coffee includes particles that tend to stick together. This causes the soil to become a barrier, obstructing water passage and causing the plants to die from thirst.


Coffee grounds are sometimes stated to be acidic. However, they can range from highly acidic to slightly alkaline. Therefore, they will not acidify high PH soils. Variable particle sizes are essential for a healthy soil structure. To put coffee grounds in your garden, you must do a lot of studies since they are quite contradictory, as they are very acidic at times and not very acidic at others.


If your garden soil is less acidic, it is typical gardening advice to add coffee grounds to your garden. It makes logic; however, the question is how acidic it is after brewing coffee. It does not appear to be as acidic.


As I said in the benefits of coffee grounds, they may be utilized as mulch. However, it turns out that it must be done with caution since mulch needs to breathe to let air and water circulate for water development.


Many scientists are interested in the subject of coffee grounds and their use in the garden.


If you don’t investigate your soil’s acidic nature and kind before adding coffee grounds, they can be quite destructive to your plants since they destroy earthworms and beneficial bacteria. Earthworms are also beneficial to the soil. Instead of assisting your compost’s flourishing microbiota, it kills it, eventually harming your plants.


According to coffee’s history, caffeine provided plants an advantage over other surrounding plants. According to many scientists, caffeine affects the germination rate in various plants depending on their kind by tying up the nitrogen level in plants. The soil of the other plants would be “poisoned” as a result. It is mentioned in some research papers, “Applying spent coffee grounds directly on urban agriculture soils greatly reduce plant growth.”


The caffeine remaining in the coffee determines its acidic PH, which depends on your brewing method.


I’m sure after reading the disadvantages, you’re discouraged and ready to toss your old coffee grounds, but if you properly examine your garden’s climatic conditions, soil type, and acidic nature, coffee grinds may be a fantastic resource for you.


In the end, it’s all about how we use it; coffee is an important part of everyone’s lives; I, like everyone else, enjoy a cup of coffee in the morning because it’s refreshing; coffee, despite its reputation, is likely to be very healthy for most people; it’s in the same category as healthy beverages like green tea. Next time you prepare a cup of coffee and consider spraying it on your plants, first check to see if the caffeine is safe for them, and then carefully analyze and investigate the benefits and drawbacks.


Your plants are extremely valuable and delicate. It’s possible that simply one thing you do will kill them, and all your past work will be undone!!!