Do Used Coffee Grounds Benefit Ferns?

Used coffee grounds can serve as a natural fertilizer, improve the soil, and even discourage pests, making them an invaluable addition to any gardener’s toolset. Contrarily, not all plants are coffee lovers like humans. Equally important is ensuring that the coffee grounds are used in a way that won’t harm the plants or the bacteria in the soil.

Do Used Coffee Grounds Benefit Ferns

When it comes to ferns, coffee is required. To avoid harming your plants or diminishing the soil quality, however, it is essential to know how to handle coffee grounds properly.

This post will discuss if used coffee grounds are good for ferns and how to utilize them effectively. Remember that these are waste grounds from the brew, not new coffee.

Do Used Coffee Grounds Benefit Ferns?

The nutrients in used coffee grounds, such as potassium, nitrogen, and phosphorus, are vital for plants to flourish and grow. These soils have a mildly acidic pH range of 6.5 to 6.8, which is ideal for ferns because acidic soil is necessary for their growth.

Almost all of the acid in coffee grounds is converted into the coffee itself (the part we drink), so they won’t do anything to improve soil pH. Don’t bother coming back once the coffee has been brewed. Even if they have an overall pH fairly close to neutral, some types are likely more acidic than others.

An alkaline pH was found in the used grounds in some of the trials! If you are worried about the soil’s pH level, a pH meter is a crucial instrument to have on hand. Applying too much-used coffee grounds to ferns can kill them. Don’t go crazy with them; moderation is key.

How Can Coffee Ground Help Your Ferns Thrive?

Used Coffee Grounds as a Natural Fertilizer

Nitrogen, the essential element for healthy, green development, is present in wasted coffee grounds at about 2%. They also include traces of nutrients like magnesium, copper, calcium, and other carbs.

A 2% nitrogen fertilizer will help the ferns stay healthy and green without over-fertilizing them or harming their roots, so it’s a good choice for routine maintenance.

Coffee Grounds as a Composting Material

The best way to reuse coffee grounds in the garden is to throw them into a compost pile. Discarded coffee grounds can be placed in a compost bin, and the finished product can be used the same way as regular compost. The nitrogen in coffee grounds not only supplies nutrients but also helps decompose the other components of the compost, ensuring that the final result is nutrient-dense and well-combined.

Coffee can be composted, but it shouldn’t account for more than 20% of the total; levels higher than 30% can have a harmful effect. Coffee grounds are a green example of a brown material that is strong in nitrogen and can be included in a compost pile.

READ The Use Of Coffee Grounds For Peace Lily

Mix with the Mulch.

Mulching with coffee grounds is a good way to provide ferns benefits without too much work. It is as simple as topping the soil your fern is growing in with a layer of grounds combined with other natural mulching materials, such as pine bark or leaf mold. Spread this mixture to a thickness of about a quarter of an inch.

It’s important to ensure the coffee is uniformly distributed and not lumpy. As time passes, the coffee’s anti-weed, anti-disease, and anti-pest properties will ensure that the compost below benefits from the nutrients. The mulching effect of used coffee grounds must be carefully managed to avoid mulch. This is because the microscopic particles can form an impenetrable barrier, preventing the fern’s vital air and water from reaching the plant.

Put some coffee grounds in the soil when you are repotting.

Here’s yet another simple application for those old coffee grounds of yours. Add a few handfuls when repotting the ferns, and make sure to blend them in well. They’ll improve the soil’s aeration and nutrient content, reduce disease and pests, and promote healthier plant growth. Never use large amounts of uncomposted grounds, especially not on seedlings or young plants, as they can be quite toxic.

Water After Application

Simply sprinkling some coffee grounds on top of the fern’s soil and giving the plant a good soaking thereafter is the simplest way to incorporate coffee grounds into the fern’s care routine. The water will carry the coffee grounds down into the soil, where the plant’s roots can absorb them.

Due to their shallow root systems, ferns benefit greatly from this method of plant care; nevertheless, excessive amounts may encourage the growth of fungi and insects. Therefore, caution is advised. Take one or two tsp once every several weeks, and you should be OK.

Don’t fertilize your seedlings with used coffee grounds!

Importantly, you should never spend coffee grounds on seedlings or other young plants. Coffee can stunt plant growth when taken in large quantities, yet a modest amount of coffee has the same effect on a young seedling as a large dose.

Considering the coffee plant itself is useful to comprehend this mechanism. Caffeine is extracted from the leaves of the coffee plant. The caffeine in these leaves is released into the soil as they fall to the ground, inhibiting other plants growth. To keep rival plants from flourishing, this chemical is sometimes utilized.

Benefits of Using Coffee Grounds

Cellulite, under-eye bags, and other signs of aging can be combated with the help of caffeine and antioxidants found in coffee grounds. The nutrients in used coffee grounds can benefit your plants and nourish pests if you sprinkle them around your yard. In addition, you may use them as an excellent washing scrub around the house due to their abrasive texture.

You can read about the many benefits of coffee grounds at Coffee Grounds In Plants, What Are The Benefits?

Possible Issues When Applying Coffee Grounds to Ferns

Promotes the growth of Fungal 

Using many coffee grounds as mulch can lead to rapid mushroom proliferation. While this fungus probably won’t cause any harm to your plant, it is a sign that you’ve had too much coffee. Reduce the amount of coffee until the layer is about a quarter of an inch thick if it is too thick to read. Protect your ferns from the fungus by leaving an inch or more space between the mulch and the plant’s stem.

Retention of Too Much Moisture

Too much coffee grounds in the soil can make it firmer and clay-like and cause it to hold too much water. As a result, you should probably repot the fern into a soil mixture with less coffee and perhaps some other components, such as perlite, to lessen the likelihood of any serious problems developing for the plant.

Never use coffee grounds on seedlings or young plants; add only a minimal amount to the compost bin. Putting more into something is much less work than taking it away.

Possible dangers to the soil

Since coffee grounds can hinder the growth of bacteria and fungi, employing too much of them could disrupt the delicate balance of the soil’s microbes. If you want to avoid this, only use coffee grounds occasionally and, ideally, compost them beforehand.

It brings pests

Pests like fungus gnats may be attracted to coffee grounds due to their odor when they rot and emit it. They won’t harm your fern, but dealing with them won’t be pleasurable.

Preventing this from occurring requires applying only a thin layer of mulch and adding additional materials, such as pine bark, to the mix. Before you plant anything, ensure the soil has been properly amended with the used coffee grounds.

Can Suppress Fern Growth!

The caffeine present can inhibit plant development in coffee grounds. The best way to avoid this issue is to compost your used coffee grounds or to make composted tea.

READ Benefits Of Coffee Grounds In Snake Plant

How Often and How Much Coffee Should I Give My Ferns?

How you plan to use it is a determining factor. You only need to do this once or twice yearly if you use coffee grounds as mulch or potting mix. Utilized coffee grounds that have been composted can be used in the same way as any other component of your compost: in the potting mix when replanting.

Coffee compost tea can be used every two weeks during the growing season but should be applied less frequently (once a month) in the fall. It’s not safe to utilize it in the winter. Remember to dilute the tea! It’s not recommended to add used coffee grounds to the soil around a plant every time a pot of coffee is brewed. Fertilizing your plant every month or two is ideal, and it won’t encourage the growth of any unwanted pests or fungus.

READ Why My Monstera Leaves Turning Brown?


Knowing how to use coffee grounds for ferns appropriately is essential. Coffee grounds that have been composted have less potential to be toxic to plants and soil. Don’t put more than 20% coffee grounds in your compost bin.

For best results when using coffee grounds as mulch, mix them with the other material first, and keep the layer at a thickness of no more than a quarter of an inch. Never water young plants with coffee compost or tea from leftover coffee grounds.