What are complementary substrates?
Various or complementary substrates are materials that, when added to the main substrate (such as soil or coconut fiber), modify its physical properties to better adapt it to the crop's needs. Although they do not contain nutrients on their own, they improve soil structure and promote root development thanks to their ability to retain water, aerate, and drain.
What uses do they have in cannabis cultivation?
These substrates are used for:
- Improve root oxygenation.
- Avoid puddles and excess moisture.
- Increase water retention, especially in outdoor crops or in dry climates.
- Customize substrate mixes based on plant type or growth stage.
Who are they ideal for?
Perfect for growers who create their own mixes, both indoors and outdoors, and are looking to adapt their substrate to specific conditions such as dry climates, spaced watering, or automatic irrigation systems. They are also very useful in hydroponics and smart pots, where water management is key.
Key benefits of these culture media
The use of complementary substrates such as perlite, vermiculite, clay, or absorbent polymers provides multiple benefits to the root environment. These materials allow roots to breathe better, prevent excess moisture, and contribute to a more stable balance between air and water within the substrate. This reduces the risk of disease, promotes the development of healthier and more vigorous plants, and optimizes irrigation efficiency, which is especially useful in extreme weather conditions or when frequent watering is not possible.
Products in this category
At Alchimia, we offer several complementary substrate options:
- Perlite: very light and porous, ideal for improving aeration and drainage.
- Vermiculite: excellent for retaining water and nutrients, ideal for seedbeds or areas with low humidity.
- Arlita (expanded clay): used as drainage in the bottom of pots or in hydroponics.
- Absorbent polymers: They retain large amounts of water that are released gradually, ideal for outdoor crops or vacations.
Which brands and products stand out?
Among the most valued products are:
- Plagron medium-grained perlite and expanded clay
- Farmer's Choice Vermiculite for lightweight mixes
- Farmer's Choice Perlite for Hydroponics or Drainage
- VDL Guerrilla Hydrogel water polymers, specially formulated for sun-drenched pots
All of them are trusted brands and widely used by experienced growers.
Frequently asked questions about various substrates
Can I use perlite and vermiculite together?
Yes, combining them allows for a better balance of drainage and moisture retention. It's a common mix for potted or seedbed crops.
Do polymers affect crop quality?
No. They are neutral products that only regulate available water. They do not alter the flavor or quality of the plant if used correctly.
