fertilizer

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  • Two containers of Plagron Terra Bloom by Bertels B.V. are displayed against a white background. The larger, dark purple container has a pink-and-white label that mirrors the design of the smaller one and is ideal for promoting abundant flowering in your garden.
    Up to 3% off
    Bertels B.V.

    Plagron Terra Bloom

    From ¥1,381 JPY
    From ¥1,381 JPY ¥1,424 JPY
  • Pictured are two Plagron Sugar Royal - Premium Bloom Booster containers from Bertels B.V.: a larger square one and a smaller cylindrical one, both with bright purple labels, white text, and a green logo that guarantees quality enriched with essential amino acids.
    Up to 10% off
    Bertels B.V.

    Plagron Sugar Royal - Premium flower amplifier

    From ¥1,946 JPY
    From ¥1,946 JPY ¥1,967 JPY
  • The image shows a purple-and-white bag labeled “Plagron Perlite – Aeration for Plant Substrates.” The 60-liter bag from Bertels B.V. describes its contents as an additive and substrate supplement designed to improve soil structure.
    Up to 3% off
    Bertels B.V.

    Plagron Perlite - ventilation for plant substrates

    From ¥1,231 JPY
    From ¥1,231 JPY ¥1,231 JPY
  • A plastic bottle labeled “Plagron pH Min” by Bertels B.V., featuring a purple-and-white design, serves as a pH regulator. It helps balance the nutrient solution and comes with a screw-top cap that includes detailed, small-print instructions for precise use.
    Up to 3% off
    Bertels B.V.

    Plagron pH min

    From ¥1,008 JPY
    From ¥1,008 JPY ¥1,008 JPY
  • The Plagron Growmix with Perlite bag from Bertels B.V. features a unique purple-pink design with eye-catching white text. It consists of 100% Terra, enriched with worm castings for better aeration, and the brand logo is prominently displayed at the top.
    Up to 2% off
    Bertels B.V.

    Plagron Growmix with Perlite

    From ¥2,077 JPY
    From ¥2,077 JPY ¥2,120 JPY
  • Five bottles of Plagron Green Sensation from Bertels B.V., in various sizes, improve plant quality. The purple bottles with white caps and green-and-white labels enhance crop quality; the largest one is shown in the back.
    Up to 11% off
    Bertels B.V.

    Plagron Green Sensation

    From ¥2,582 JPY
    From ¥2,582 JPY ¥2,903 JPY
  • Four bottles of Plagron Alga Bloom Natural Plant Fertilizer by Bertels B.V., ideal for the flowering stage, come in two large and two small bottles. Each bottle features a bright purple design and green “100% Organic” labels that stylishly showcase these essential plant nutrients.
    Up to 35% off
    Bertels B.V.

    Plagron Alga Bloom of natural plant fertilizers

    From ¥439 JPY
    From ¥439 JPY ¥676 JPY
  • Two containers of Plagron Terra Grow mineral base fertilizer from Bertels B.V. are displayed against a white background. The larger purple container and the similar smaller bottle have pink and white labels promoting an improved formula for faster plant growth during the growth phase.
    Up to 6% off
    Bertels B.V.

    Plagron Terra Grow

    From ¥430 JPY
    From ¥430 JPY ¥430 JPY
    ¥4,300 l
  • A bag of Plagron Lightmix with perlite substrate from Bertels B.V., available in purple and pink, contains 100% Terra-enriched soil with white text. The upright bag displays product information and perlite details at the bottom, highlighting the quality of Plagron's soil.
    Up to 2% off
    Bertels B.V.

    Plagron Lightmix with Perlite

    From ¥1,993 JPY
    From ¥1,993 JPY ¥2,034 JPY
  • Image of two Plagron Power Roots containers from Bertels B.V.: a large square one and a smaller bottle, both purple. The labels highlight “faster root development” with a “new formula” containing humic acids, in bright yellow and purple.
    Up to 35% off
    Bertels B.V.

    Plagron Power Roots

    From ¥1,473 JPY
    From ¥1,473 JPY ¥1,554 JPY
  • The image shows three containers of the Plagron Power Buds biostimulator from Bertels B.V., featuring purple labels and white text promoting flower formation: the largest on the left, the medium-sized one on the right, and the smallest in the center.
    Up to 8% off
    Bertels B.V.

    Plagron Power Buds

    From ¥1,573 JPY
    From ¥1,573 JPY ¥1,573 JPY
  • The image shows two containers of Bertels B.V. Plagron Hydro A + B two-component fertilizer for the flowering stage: a larger “Hydro A” and a smaller “Hydro B,” both with blue-and-white labels and information on nutrient uptake.
    Bertels B.V.

    Plagron Hydro A + B - two -component fertilizer for the flowering phase

    From ¥2,421 JPY
    From ¥2,421 JPY ¥2,421 JPY
  • Four containers of Plagron Alga Grow Natural Growth Fertilizer by Bertels B.V. include two large purple jugs and two smaller bottles. Green and white labels read “100% Organic” and highlight its role as an essential nutrient for your garden.
    Up to 20% off
    Bertels B.V.

    Plagron Alga Grow natural growth fertilizer

    From ¥676 JPY
    From ¥676 JPY ¥676 JPY
  • The picture shows two containers of Plagron Calmag Pro by Bertels B.V. The larger one is a purple, square canister, and the smaller one is a purple bottle. Both are labeled as “supplements” in the “Universal” category and contain a calcium-magnesium formula for essential plant care.
    Bertels B.V.

    Plagron Calmag Pro

    From ¥916 JPY
    From ¥916 JPY ¥916 JPY
  • The photo shows two Bertels B.V. Plagron PK 13-14 containers—for firmer and harder fruits—both in dark purple with white and purple labels bearing the brand name, product name, and usage instructions.
    Up to 35% off
    Bertels B.V.

    Plagron PK 13-14 - for firmer and harder fruits

    From ¥809 JPY
    From ¥809 JPY ¥809 JPY
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Fertilizer - for healthy growth and strong plants

A nutrient-rich soil is the foundation for vigorous growth, vibrant blooms, and a bountiful harvest. Fertilizer provides plants with exactly the nutrients they need for healthy development - from seedlings to full maturity. Whether in the garden, on the balcony, or in professional cultivation: The right fertilizer ensures optimal conditions and sustainably strengthens plants from within.

High-quality fertilizers not only improve nutrient supply but also soil structure. They promote root formation, increase resistance to diseases, and help maintain a balanced soil life in the long term.

 

This is what distinguishes high-quality fertilizer

A good fertilizer convinces with a balanced composition and easy application. Depending on the type of plant and season, plants require different nutrients - nitrogen, phosphorus, potassium, and trace elements are the most important building blocks.

In addition to classic mineral variants, organic and biological fertilizers are gaining importance. They act gently, promote soil life, and contribute to sustainable gardening.


Advantages of modern fertilizers at a glance:
  • Promote vigorous plant growth and root formation
  • Strengthen resistance to pests and diseases
  • Improve soil structure and nutrient absorption
  • Environmentally friendly and effective in the long term
  • Suitable for gardens, houseplants, and professional cultures

An example of natural plant nutrition is the liquid Neudorff Azet Universal Fertilizer, which contains all important nutrients and is suitable for almost all plants. The Neudorff Azet Citrus & Mediterranean Fertilizer ensures healthy leaves and aromatic fruits in Mediterranean plants with organic components. For sustainable soil revitalization, the Neudorff Sandy Soil Improver is recommended, which loosens the structure and improves water retention - ideal for sandy soils.


Application and practical tips for optimal fertilization

The correct application of fertilizer is crucial for success. Too much can harm plants just as much as too little. Therefore, the recommended dosage and the individual needs of the plants should always be considered.

Tip:

  • Spring: Initial fertilization for vigorous growth and new shoots
  • Summer: Subsequent fertilization to support flowering and fruit formation
  • Autumn: Potassium-rich fertilization strengthens plants for winter
  • Year-round: Liquid fertilizers or organic alternatives for potted and indoor plants

When applying, it is important to distribute fertilizer evenly in the root area and then water well. Liquid fertilizers can be conveniently administered through the irrigation water, while granules and pellets are ideal for beds or lawns.

Organic fertilizers work more slowly but more sustainably, as they enrich the soil with humus and promote natural soil life. This creates a healthy balance that ensures strong and resilient plants in the long term.


Sustainability Meets Effectiveness – Your Partner for High-Quality Fertilizers

Fertilizer is much more than a nutrient source – it is a key to sustainable plant care and healthy garden culture. With the right products, the balance between powerful supply and environmentally conscious action is achieved.

In addition to fertilizers, you will find many other product areas at Altruan that perfectly complement your gardening and care work:

Altruan stands for quality, sustainability, and expertise. With high-quality fertilizers and complementary accessories, you create ideal conditions for strong plants, blooming gardens, and healthy harvests – year after year.

Brands and categories in focus

Here you will find complementary products matching the current collection.

Why is fertilizer important for plants?

Fertilizer provides plants with essential nutrients such as nitrogen, phosphorus and potassium. These promote growth, flowering and fruit formation and prevent deficiency symptoms that can lead to weak or diseased plants.

What types of fertilizer are there?

There are mineral, organic and biological fertilizers. Mineral ones work quickly, organic ones promote long-term soil health. Biological fertilizers combine both advantages and are particularly environmentally friendly.

How often should you fertilize?

This depends on the type of plant and the season. In spring and summer, regular fertilization is usually carried out every two to four weeks. Houseplants can be supplied with liquid fertilizer at longer intervals all year round.

Are organic fertilizers better for the environment?

Yes, organic fertilizers are made from natural raw materials and sustainably promote soil life. They improve humus formation and reduce the risk of over-fertilization - ideal for ecologically conscious gardeners.