Liquid fertilizer provides your plants with the most important nutrients and thus supports the growth and health of flowers, vegetables and other plants. You can find out what is important when buying a liquid fertilizer and which products are recommended in our guide.

The application of liquid fertilizer is very simple

Our recommendations

our recommendation
2x 1L BLATTWERK Pure Bio universal fertilizer, vegan organic NPK liquid fertilizer
24.95 EUR To the product
kind organic
NPK composition 1,3 % - 0,7 % - 5,3 %
organic quality Yes
capacity 2L
Price/litre about {PRICE/2} EUR

The majority of reviewers on Amazon are completely enthusiastic about the Blattwerk organic liquid fertilizer. At first glance, the NPK proportions of the purely organic complete fertilizer appear low - but in practice the composition obviously proves to be just right. Statements such as "incredibly good", "great effect and growth" or "magic potion" speak for themselves. In view of the high quality and the fair price-performance ratio, the Blattwerk fertilizer deserves first place in our comparison test.

our recommendation
Nutri ONE universal fertilizer, liquid concentrate for potted plants, balcony plants, vegetables, herbs and garden, 1 liter liquid fertilizer
12.99 EUR To the product
kind organic-mineral
NPK composition 5,5 % - 5,0 % - 7,5 %
organic quality no
capacity 1L
Price/litre approx. EUR {PRICE/1}

For plants that need a serious NPK boost quickly, Nutri ONE's universal liquid fertilizer is an excellent choice. It convinces with the very high proportions of the three most important substances for plants. The buyers of this complete fertilizer on Amazon are enthusiastic. He should be "really good" and bring visible success after just a few days as far as the growth of the plants is concerned. The only disadvantage: the liquid fertilizer is not of organic quality.

our recommendation
Substral Naturen organic plant food, purely plant-based, vegan universal liquid fertilizer for ornamental plants, fruit and vegetables in buckets on the balcony, terrace and garden, 2 liter canister
15.49 EUR To the product
kind organic
NPK composition 3,5 % - 0,0 % - 5,0 %
organic quality Yes
capacity 2L
Price/litre about {PRICE/2} EUR

Third place goes to the organic liquid fertilizer from Substral - primarily because of the particularly good price-performance ratio. In fact, the product is very cheap for its high quality and capacity. However, it is a two-nutrient fertilizer that does not contain phosphorus. For plants that do not necessarily need this substance, the NK fertilizer is an excellent choice. He should make plants and gardeners happy. Tip: Be sure to use an external measuring cup and pour out the fertilizer carefully, otherwise there could be a little mess.

Purchase Criteria

kind

Organic liquid fertilizer: With this “natural fertiliser”, the nutrients cannot be used immediately by the plants. They first have to be extracted from their organic structure. Then the roots can absorb the precious substances. Since a variety of chemical reactions in the soil are involved in this process, an organic liquid fertilizer takes longer to work. But the effect lasts longer afterwards. Caution: In the case of acute nutrient deficiency, organic liquid fertilizer is not suitable!

Mineral liquid fertilizer: Here the nutrients are already contained in their "pure" form. This will release them faster. The disadvantage is that the effect lasts shorter than with organic liquid fertilizer. There is also the risk of over-fertilization. Sometimes mineral fertilizer is also poisonous. One advantage is the generally somewhat lower price. This type of fertilizer is a good choice as a starter fertilizer and in the event of an acute lack of nutrients.

Organic-mineral liquid fertilizer: This consists of organic and mineral fertilizers, so that it combines the advantages of both types and suppresses the disadvantages as far as possible. Thus, organo-mineral liquid fertilizer acts as the "golden mean".

composition

Nitrogen, phosphorus and potassium are the most important substances for plants. These can be found in different constellations and with varying proportions in the various liquid fertilizers. Roughly one differentiates:

  • Complete fertilizer (NPK fertilizer* - all three substances included)
  • Bi-nutrient fertilizer (contains two of the above substances)
  • Straight fertilizer (contain one of the substances mentioned above)

* The letters N, P and K are the chemical element symbols for nitrogen (N), phosphorus (P) and potassium (K).

Complete fertilizers, i.e. NPK liquid fertilizers, are preferably used. Only if a plant does not need one or two of the main nutrients or if there is an acute nutrient deficiency should you use a two-nutrient or single-nutrient fertilizer.

As far as the percentage distribution of the three main ingredients is concerned, it is best to stick to the following rules of thumb:

  • nitrogen-rich liquid fertilizer for all plants that primarily need to grow well and develop charming leaves ("green manure")
  • phosphorus-rich liquid fertilizer for all plants that are supposed to flower magnificently and bear fruit ("blooming fertilizer").

organic quality

When in doubt, it is better to buy liquid fertilizers of organic quality. Then you can be sure that the fertilizer does not contain any substances that are harmful to people and/or pets.

our recommendation
Undergreen by Compo Jungle Fever, food for all green plants in the room or on the balcony, organic liquid fertilizer, 400 ml
7.99 EUR To the product

capacity

The price per liter often becomes cheaper as the quantity increases. In addition, liquid fertilizer has a long shelf life. For these reasons, it is worthwhile to prefer a larger filling quantity - always assuming that the quality is right.

frequently asked Questions

What is liquid fertilizer?

Liquid fertilizer is the liquid form of plant fertilizer that you use to provide different plants with the nutrients they need. There are universal fertilizers and special fertilizers that meet the needs of a specific plant species or group.

Liquid fertilizers are mainly composed of nitrogen, phosphorus and potassium. These minerals are essential for the growth and health of flowers and other crops. Supplementary components in liquid fertilizers: magnesium, calcium, sulfur and trace elements and sometimes also iron.

What is Guano Fertilizer?

Guano fertilizer refers to a specific natural flower fertilizer (€1.95) that is enriched with guano (€121.99) - i.e. bird excrement. The term has its origins with the South American Inca, who gave the sea bird droppings the name "Huano" and used it to fertilize their fields. Today, either seabird or bat guano is used for guano fertilizer. Both are rich in nitrogen and phosphorus, making them wonderful plant fertilizers.

our recommendation
COMPO flower fertilizer with guano for all indoor, balcony and patio plants, special liquid fertilizer, 5 liters
24.99 EUR To the product

Fertilizer sticks or liquid fertilizer - which is better?

Fertilizer sticks (€4.48) are a practical alternative to liquid fertiliser. Simply stick them into the ground near the roots. As a result, the rods gradually release the nutrients. But: In order for them to work really well, it is essential to keep the soil evenly moist. Liquid fertilizer is often easier to achieve evenness.

our recommendation
COMPO flowering plants fertilizer sticks with guano, 3 months long-term effect, 30 pieces
4.99 EUR To the product

For which plants is liquid fertilizer suitable?

Liquid fertilizer is basically recommended for almost all plants - especially those that benefit particularly from regular fertilization, i.e. fast and vigorously growing green creatures. It always depends on the exact composition which liquid fertilizer harmonizes with which plants.

tips

For cacti, orchids, palm trees and hydroponic plants, we recommend special fertilizers with a nutrient profile that perfectly suits their needs. You can usually care for most other plants with a good conscience with high-quality universal fertilizer.

How do I apply liquid fertilizer correctly?

Liquid fertilizer has the advantage over solid fertilizer that you can simply spread it over the irrigation water. Depending on the fertilizer and the plant, this makes sense about once or twice a week. As far as the correct dosage is concerned, it is best to follow the information provided by the fertilizer manufacturer.

How long does liquid fertilizer keep?

Many hobby gardeners ask themselves whether liquid fertilizer can go bad. Don't worry: liquid plant fertilizer has a long shelf life. You can use it for several years without hesitation. That's why there's nothing wrong with buying a larger container.

Where is the best place to buy liquid fertilizer?

Good quality liquid fertilizers can be found at garden centers, florists and hardware stores. Liquid fertilizers are also sometimes available in drugstores such as DM or Rossmann and in discounters such as Aldi (own brand Gardenline) or Lidl. However, Amazon offers you the largest selection. There are products from the following well-known brands:

  • Compo
  • WOLF garden
  • Gardena
  • Green Jan

Can I make liquid fertilizer myself?

Yes, you can also make liquid fertilizer yourself. This video will provide you with inspiration:

youtube

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