Dennerle Plant Care K 250ml

Dennerle Plant Care K 250ml

  • Targeted supply of potassium
  • For demanding aquarium plants
  • For intensive leaf colouring
In stock, only 8 left
Free shipping on orders over € 60,- within Germany Change region
Express delivery possible
1-3 business days - order today and we’ll deliver next week on Monday at the earliest
I want to order to 
€ 51,60 / l
incl. VAT
plus € 5,90 Shipping
Item is now in your shopping cart!
View my cart

Item question

We’re here for you!

Please enter your question and e-mail and we’ll contact you as soon as possible. It usually takes us up to 24 hours during business days to respond.

Thank you for your question!

Thank you, we’ll get in touch!

Close window

You already sent us a question.

Please wait a few minutes


Dennerle Plant Care K is a potassium macronutrient fertiliser for planted and demanding aquariums.
Potassium has a variety of functions in the plant. It is present in high concentrations both in the cells themselves and in the vascular system. Potassium is an osmotically active ion that is crucial for building up root pressure and cell pressure (turgor). Furthermore, it is involved in various metabolic processes, e.g. the synthesis of sugars, starch, cellulose and lignin. Potassium can be stored in the plant cells and transported within the plant when needed, e.g. from older to younger leaves. A certain amount of potassium is supplied by tap water. The harder the water, the more; the softer the water, the less. You can find out the content from your local water supplier. Potassium is only introduced into the aquarium in very small quantities via food and fish excretions. Good aquarium fertilisers (micro-nutrient fertilisers / complete iron fertilisers) such as Dennerle Plant Care Pro therefore always contain an appropriate amount of potassium. This is usually sufficient for normal, planted community aquariums. For demanding planted aquariums, however, (e.g. aquascaping aquariums, Holland aquariums) the situation is different. They have an above-average nutrient requirement, especially for macronutrients. This is due to the large amount of aquatic plants and the low fish stocking in the aquarium.

Potassium deficiency can occur in these types of aquariums, especially in soft water. It mainly shows on the older leaves. When needed, the element is transported from the older leaves to the younger leaves via the vascular system. Typical symptoms are yellowing (chlorosis), which can appear in spots or over a large area between the leaf veins or at the leaf margin. Later, the tissue dies in spots or over a large area (necroses). Some plants are particularly sensitive to low potassium levels. Well-known examples are the parrot leaf (Alternanthera) and the cognac plant (Ammania). Growth can suddenly stop and the newly formed leaves are crippled. In the case of the Indian hygrophila (Hygrophila polysperma), potassium deficiency shows up on the older leaves in the form of small black spots (necroses).
It therefore makes sense for demanding plant aquariums to keep an eye on the potassium content and supplement it if necessary. Each aquarium has a specific nutrient consumption depending on the amount of plants, plant species, animal stocking, feeding, water changes and growth conditions (amount of light/lighting time, CO2 addition, filter technology, etc.). The required amount of fertiliser should therefore be determined individually for each aquarium.


  • Potassium macronutrient fertiliser for planted and demanding aquariums
  • For the targeted supply of potassium
  • For magnificent plants and intensely bright colours
  • High coverage due to concentrated active ingredients


The fertiliser can be dosed precisely and accurately: 2 ml per 100 l add 1 mg/l potassium. The optimal potassium concentration is in the range of 10 - 20 mg/l. Dennerle recommends measuring the potassium content regularly and dosing Plant Care K accordingly. Plant Care K can be used as a weekly or daily fertiliser.


K fertiliser solution 5,5
5,5 % K2O Water-soluble potassium oxide
Net mass: See product packaging; Distributor: Dennerle GmbH, D-66981 Münchweiler, Germany

Ancillary components: 0,66 % K2O water-soluble potassium oxide. Processing aids: For preservation: potassium sorbate. Application aids: colorant. Storage instructions: Store at room temperature. Protect from heat and frost. Keep out of reach of children and pets. Application specification: Only for fertilizing ornamental plants in aquaria. For detailed instructions for use and dosage, see package information. Note: Official advice is to take precedence over our information.



Dennerle has been operating in Vinnigen since its foundation in 1966 and, after more than 50 years of company history, the building blocks Dennerle relies on is experience. The philosophy behind Dennerle is to create a small and tangible, intact piece of nature, in harmony with the natural environment. That is why sustainability is a company-wide concept and is implemented at every possible point. In order to achieve an ecologically balanced aquarium, Dennerle relies on a system that is based on 5 pillars. Animals, plants, water, substrate and lighting. Dennerle offers the optimum equipment to bring this complex, but not complicated system into harmony.

General information

Item no.
EAN 4001615048186
Weight 0,27 kg
Shipping weight 0,30 kg

Customers ask customers

You have questions about this product? Ask other customer or our support team about this product!

Customer reviews

This item has not been rated
Please sign in if you want to write a review. Sign in
5 Stars(0)
4 Stars(0)
3 Stars(0)
2 Stars(0)
1 Star(0)