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More and more hobby gardeners are fertilizing their plants with coffee grounds, and rightly so! Because the supposed waste product contains many important nutrients such as phosphorus, nitrogen and potassium. Coffee is therefore not only a cheap, but also an environmentally friendly fertilizer. In this article we have summarized for you which plants coffee is particularly suitable as fertilizer.

Coffee grounds as fertilizer


Blackberries are known for bearing a variety of blue-black fruits. However, professional care is essential for this, which in turn includes regular fertilization. The wild berry is best fertilized with a special berry fertilizer, as this has a high potassium content and is therefore perfectly tailored to the needs of the plant. Since the blackberries feel most comfortable in acidic soil and a pH of around 5, they can also be supplied with coffee fertilizer. Fertilize in spring and, if necessary, before the ripening period.

  • Latin name: Rubus sectio Rubus
  • Synonyms: forest berry, blackberry
  • Genus: Rose family (Rosaceae)
  • Location: sunny or semi-shady
  • Soil: moist, humic, well aerated, slightly acidic

tip: Organic fertilizers such as cow or horse manure are also suitable for fertilizing blackberries. You can also fertilize with blue grain, although you should pay attention to a modest dosage.

angel trumpet

The angel's trumpet not only has an extremely high water but also nutrient requirement. Accordingly, it regularly requires water and fertilizer, with a water-soluble complete fertilizer made of nitrogen, potassium and phosphorus being best suited. These nutrients are also found in the coffee grounds, which is why they can also be used additionally. The coffee fertilizer is best worked into a mulch layer, which is recommended for the angel's trumpet anyway.

  • Latin name: Brugmansia
  • Synonyms: Evil Eagle Tree, Burundanga
  • Genus: Nightshade family (Solanaceae)
  • Location: sheltered from the wind, avoid midday sun
  • Soil: rich in nutrients

notice: Coffee grounds are not only suitable as a fertilizer, but also as a natural home remedy against snails. Since angel trumpets like to be attacked by the pests, the use of coffee fertilizer is all the more recommended.


Geraniums are known for their gorgeous, colorful flowers. In order for the flowers to develop in the best possible way, regular fertilization is required in addition to the appropriate choice of location. The geraniums usually receive the first fertilization directly when they are planted, because at this point a slow-release fertilizer is worked into the soil. They are then fertilized with a liquid fertilizer either weekly or every 14 days. If the plants also receive coffee fertilizer, their nutrient requirements are certainly covered.

  • Latin name: Pelargonium
  • Synonyms: cranesbill, burning love (South Tyrol)
  • Genus: Cranesbill family
  • Location: full sun to half shade
  • Soil: permeable and rich in nutrients


Organic fertilizers, such as stable manure, are particularly suitable for cucumbers. They can also be easily fertilized with rock dust or nettle manure. Incidentally, the latter can be made yourself and is therefore a particularly inexpensive choice. The plants also enjoy a layer of mulch, which keeps the moisture in the soil. The coffee can be easily incorporated into these and provide the cucumbers with additional nutrients.

  • Latin name: Cucumis sativus
  • Synonyms: Kukumber
  • Genus: Cucurbitaceae
  • Location: full sun and sheltered from the wind
  • Soil: humus and loose


When fertilizing blueberries, the most important thing to consider is their needs, because they prefer a pH value in the soil between 4.0 and 5.0. To ensure that the pH value does not increase too much, calcareous fertilizers should be avoided. The situation is different with coffee grounds, because they keep the pH value low and the soil acidic. To ensure that the plants bear plenty of fruit from July to September, they are fertilized annually in spring and in June for flowering and fruiting. A low-lime fertilizer for rhododendrons and azaleas and some coffee grounds is best for this.

  • Latin name: Vaccinium myrtillus
  • Synonyms: mollberry, wildberry, blueberry
  • Genus: Bilberries (Vaccinium)
  • Location: full sun and sheltered
  • Soil: acidic sandy soil, permeable and lime-free


Currants are considered to be comparatively undemanding, but they are also happy about regular fertilizer delivery. A special berry fertilizer is best for this, but compost or stable manure also provides the plants with plenty of nutrients. Anyone who fertilizes the currants organically with compost or manure can also enrich it with coffee grounds. The timing of the fertilization is also important, because currants are fertilized for the first time in March before they sprout again. They are then fertilized from April to May and supplied with a portion of nutrients for the last time in autumn.

  • Latin name: Ribes
  • Synonyms: Red currant, sea turkey, mulberry
  • Genus: Gooseberry family (Grossulariaceae)
  • Location: sunny or semi-shady
  • Soil: moist, rich in humus and nutrients

tip: The shallow-rooted currant particularly benefits from a layer of mulch.


Not only does the pumpkin require a lot of space, but also at least six hours of sunlight per day. In order to support growth in the best possible way, regular fertilization is also recommended. Pumpkins are best fertilized once a week with a nitrogen-rich complete fertilizer, which is mixed into the irrigation water once a week. An environmentally friendly alternative is compost, which provides the plant with nutrients in the long term. To improve the compost a little bit, coffee can be incorporated into this.

  • Latin name: Cucurbita
  • Synonyms: melon fruit
  • Genus: Cucurbitaceae
  • Location: full sun and sheltered
  • Soil: moist, rich in nutrients and humus
Hokkaido pumpkin


The rhododendron impresses above all with its diversity of species, because around 1000 different rhododendron species are known worldwide. While some of these species can reach a height of several meters, others grow into small flowering shrubs. When caring for it, not only the high moisture requirement must be taken into account, because the plant also wants to be fertilized regularly. There are special fertilizers for the rhododendron, but coffee is also suitable for the heather plants. This is best mixed with horn meal and worked flat into the soil.

  • Latin name: Rhododendron
  • Synonyms: alpine rose, rose tree
  • Genus: heather family (Ericaceae)
  • Location: avoid direct sun
  • Soil: loose, humic and acidic
Rhododendron with pink flowers


Tomatoes have the decisive advantage that they can be cultivated both outdoors and in pots on the balcony. They are also considered to be relatively easy to care for, so that with a little skill even inexperienced hobby gardeners can expect a high-yield harvest. One of the most important factors is a balanced supply of nutrients to the plants, because tomatoes are one of them heavy feeders. To ensure that their nutritional needs are always met, you should fertilize tomatoes regularly. A variety of fertilizers are available for tomato plants, such as liquid fertilizer or compost. In addition, tomatoes can be fertilized with coffee grounds by simply incorporating them into the mulch layer.

  • Latin name: Solanum lycopersicum
  • Synonyms: love apples, paradise apple, tomato
  • Genus: Solanaceae
  • Location: full sun and warm
  • Soil: nutritious and loose


In addition to tomatoes and peppers, zucchini can also be easily grown in the home garden. Caring for the plant includes not only regular watering, but also a balanced supply of nutrients. The courgettes need most of their nutrients from early June to mid-August, which is why you should fertilize regularly during this time. A conventional tomato or cucumber fertilizer is suitable for fertilizing, but organic fertilizers such as nettle manure, rock flour or horn shavings are also suitable. Coffee can also be used as fertilizer, which can be mixed into a mulch layer, for example.

  • Latin name: Cucurbita pepo
  • Synonyms: zucchini
  • Genus: Cucurbitaceae
  • Location: sunny and warm
  • Soil: permeable, humic and rich in nutrients

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