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100% organic!

All Guanokalong® and GK-Organics® products produce fantastically growing and flowering healthy plants using 100% organic means.

Premium Dutch Mixture

Guanokalong® is a balanced mixture of guano from various parts of the world, carefully proportioned to produce top results!

Planet Friendly

Guanokalong® is Control Union-certified and works exclusively with ecologically certified sustainable suppliers.

There’s something for every grower.

The Guanokalong® and GK-Organics® product lines provide various products that provide optimal growth and flowering conditions. Are you familiar with these products yet?

About us

Guanokalong® and GK-Organics® are Femeg brand names; Femeg is a proud initiative from Dutch founder Egbert van Meggelen.

Femeg collects the best resources from various parts of the world, and from the Netherlands, provides 100% organic products to meet the needs of people who want to be sure of the purity of their fertilisers and plant consumables, people throughout Europe who realize how important fertilisation is for the quality and flavour of plants and plant-based nutrition.

Femeg has been a Control Union for Organic Input certified company since 2012.



  • Java and Madagaskar

    In the coastal caves of Java and Madagascar, bats have been living for centuries in an untouched and completely natural environment. They feed on insects and fruits from their surroundings.

  • Harvesting by hand

    Over the course of centuries, their droppings have naturally decomposed into an odourless compost. This rich resource is harvested with respect for the environment and the surroundings under the supervision of local authorities. Not with rattling machines, but with spatulas and oil lamps.

  • Additional resources

    Additional organic resources are procured from other parts of the world from exclusively organically certified suppliers. For example, palm tree ashes from Sumatra and seaweed powder from Norway. A few other suppliers come from the Netherlands, Belgium and Germany.

  • Premium Dutch Mixture

    All our organic raw materials first come together in Aalten (NL) where they are processed by two to four employees to well-proportioned, balanced products. From here, the premium products find their way to numerous garden centres, potting soil producers, organic growers and distributors across Europe.

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