Myco needs literally one single spore to colonize an entire forest. Myco suppliers don’t want you to know that because then you’ll end up like me, never using the whole bottle up before it expires. I spent 15$ on myco 2 or 3 years ago and have grown a lot of plants since then. I technically don’t even need to buy another bottle because I keep a rootball that has spores in it.
@Melville Hobbes @InTheShed myself, and someone else I think, had a conversation about how myco doesn’t just disappear. It may go dormant or may pull back in a grow but it doesn’t just float out of the medium. Once conditions are correct, it comes back online
The thing about supplier directions for myco is, they want to A) make sure you use up the product quickly, which is why they’ll even recommend you use it in between transplants in your water source, which doesn’t make sense but I digress. (B) they want to make sure it works for you. When you use less, you have less room for error and can upset the balance. When you have more, that’s more chances to be successful.
The thing about myco is though, it takes time to establish. It takes at least 2 weeks to link up with the plant and colonize. It takes another 2 weeks to really fill out and get things going. If you checkout the magic mushroom journals you’ll see similar. It takes time for the myco to grow out and establish, but once it does, it’s all in. During this time it’s important to keep available P away.
This time it takes is why you’ll see the most benefit from adding it to your sprouts. I like to roll my seeds in it, then cut in a little of my used soil. Don’t bother adding it at the end of veg, it’s not worth it, especially with the premium priced products. If cost isn’t a big deal then go ahead, especially for long flower sativas