- Jan 17, 2021
- Reaction score
- Northern Ontario, Canada
If you continue to feel like the plants are stunted, or start to look light green or yellow-y colored, you might want to check out 'nutrient lockout in coir'. Sodium is often high in coir, if unbuffered. Coir needs to be processed and treated very specifically to be safe for seeds as a planting medium and some companies are def selling mixes that are unbuffered. It also has a high 'cation exchange capacity' which basically means calcium and magnesium will not be available to the plants because of the coir substrates. In a nut, the plants in the medium can starve even if your fertilizing regularly because the coir is binding it up.The UK is absolutely right to step away from harvesting peat moss. I don't use it when ever possible, except when it is given to me by others. I think it's a great medium, but just not worth the environmental degradation it causes.
I tried coco coir, as the initial seedling medium as it is sterile. It does a fine job, but obviously you need to pot up to something with nutritional value. I think my current one is made with coco coir, earth worm castings, compost, and tree bark.