Dry coffee grounds as flower fertilizer - valuable ingredients

The Content Of The Article:

Roasted coffee beans

Tannins are slightly acidic, so have a neutralizing effect on lime. That can be an advantage. Antioxidants, on the other hand, protect cells and can reduce the risk of damage, for example from environmental toxins, pollutants and solar radiation.
When coffee grounds as fertilizer these and other substances, such as caffeine among other things, as well as in humans stimulating and protective.


Anyone who owns a fully automatic coffee machine or has forgotten the filter bag in the machine knows how fast coffee grounds mold. As a fertilizer, of course, it is no longer useful. Therefore, the mold must be urgently prevented, for which the moist powder must be dried simply. There are several ways to do this:
  • Spread coffee grounds thinly, for example on a metal tray or in a flat, open container and air-dry
  • Crushed coffee grounds, for example, from fully automatic machines or espresso machines crumble and dry on a plate
  • Heat at 50 to 100° C on a baking sheet in the oven for half an hour
  • Cook for at least 5 minutes at medium power in the microwave
It is important that thereafter no residual moisture is found in the coffee grounds. otherwise it will be a suitable breeding ground for mold spores despite the treatment. This is particularly annoying when already large quantities were collected and stored with care - but then are useless by the mold.


Whether it generates coffee grounds every day or only a few times a week - as a fertilizer it is usually not consumed immediately. Especially when used in the garden, the use seems to be worthwhile only for larger quantities. For this purpose, the fertilizer from the coffee machine is finally dried.
In addition to this measure, however, it must also be stored properly. It depends on the following points:

1. Dry the coffee grounds properly. Crumble it very finely and thinly lay out. He should be powdery again afterwards and trickle without problems, must not fill up by any means moist.

2. Allow the dry coffee grounds to cool well before transferring them to an airtight container. Do not close the container, as long as there is still a damp mist on the inner surface.

3. Store the container in a closed, dry, cool and dark place - for example in a refrigerator.

Tip: If the coffee grounds fall daily and is consumed relatively quickly as a fertilizer, it does not need to be specially preserved in a container. However, it should be ensured that it can dry thoroughly and remains dry.



The easiest way to use coffee grounds as a versatile fertilizer and to use its valuable ingredients, is the introduction into compost or used soil. The coffee grounds should also not be used moist if possible, because then again threatens mold growth.
In addition, it must be well distributed in the compost or the substrate for the same reason. If it is simply thrown up as a layer above, fungal spores could spread on it and render the soil unusable.


Coffee grounds can be used as direct fertilizer in two ways. Common are both variants. So it can be used dry on the one hand, but should then be easily incorporated into the earth or only very thinly distributed on it. For pot and container plants, repotting can be used for this purpose. In the garden or when planting in the open air, the dry coffee grounds can be scattered thinly around the plants and the soil can be easily hooked.
As a second variant, the liquid fertilizer with coffee grounds offers, for this he must not be dried in advance - if it is used directly, ideally given directly from the coffee machine in the irrigation water is. However, it should not be too much coffee grounds. One to two tablespoons per liter of irrigation water are enough. In order to get the maximum benefit from it, the coffee grounds / water mixture should be able to stand out for at least a few hours or even a day and should also be stirred before pouring.

Basic earth

In addition to being used as a fertilizer, the coffee grounds can also be used for the slight acidification or neutralization of very basic soil. He serves this purpose due to the tannin contained. Of course, it should be noted that the nutrient content of the substrate also increases.

Hard water

Like alkaline earth, calcareous water is "hard". Some plants do not get this pH range. If the plants need soft water or even an acidic or neutral substrate, coffee grounds can serve them well. It can be added to the irrigation water or soil as described.
Tip: If necessary, to adjust the dosage, to avoid acidification and to create optimal conditions for the plants, the pH of the soil should be checked regularly.


Due to the slightly acidifying effect, coffee grounds are suitable as flower fertilizers especially for plants that prefer an acidic pH. Including:
  • azalea
  • Berry
  • angel's Trumpet
  • cucumber
  • hydrangea
  • pumpkin
  • rhododendron
  • rose
  • tomato
  • zucchini


Whenever soil is too basic or water too hard, the coffee grounds can also be used as fertilizer. In anyway very acidic soils, however, should be paid to the compatibility of the plants, so as not to risk acidity.

Dosage and frequency

With coffee grounds soil and plants can hardly be overfertilized, as long as it is not spread in large quantities or too often. As a rule of thumb, houseplants can be fertilized twice and garden plants up to four times a year with coffee grounds. The additional nutrients should be given during growth.
It is also important that, even without the risk of over-fertilization, the coffee grounds are not incorporated in kilograms into the substrate. Even if the nutrients do not become problematic, the danger for the mold of the earth increases. For wet substrates anyway, the coffee grounds should be used sparingly as a fertilizer. It may be a bit more for dry earth. In general, it makes sense first to use only about a mixing ratio of one part of coffee and ten parts of soil and to increase the amount only if this mixture is well tolerated.
Tip: On the compost, the coffee grounds are different. Here it may be something more. In the decomposition useful soil organisms are even attracted to it. He should, as mentioned, well distributed in it and not be applied as a layer.

Deterrent agent

The coffee grounds are due to its valuable ingredients not only good properties as a flower fertilizer own, he is also awarded other positive effects.
For example, he should keep away certain types of snails and could thus prove to be a deterrent border around the vegetable patch or individual plants. The coffee grounds are not there for a completely safe and guaranteed protection, but it's worth a try. If he does not bring the desired success, he can still be incorporated as a fertilizer in the soil.
Incidentally, a similar effect should be achieved with coffee grounds in cats. Since they do not particularly like the smell, beds should be prevented from serving as a litter box. But beware: some velvet paws simply jump over the drawn border of coffee powder.
If wasps once again interfere with the food outdoors, the coffee grounds should also be able to serve well. It is lit in a flat, refractory shell and used as an incense. Although he does not smell too pleasantly coffee, the wasps should be kept away efficiently.
Coffee grounds can be used in many ways as vegetable and flower fertilizers and even beyond in the garden. It only needs to be considered that the coffee grounds are properly prepared, stored and used in coordinated quantities, so that it does not entail an increased risk of mold growth.

Video Board: Coffee Grounds: How And Why We Use Them In Our Garden.

© 2019 EN.Garden-Landscape.com. All Rights Reserved. When Copying Materials - The Reverse Link Is Required | Site Map