Wondering if All these crosses are going to take from the original strains

[Prop215Life]

I know that a lot of people hold the true classic cuts but do any of you guys wonder if eventually all these crosses will ruin any of the traits that strains were bred for. I see a lot of someone or even myself crossing this strain with this strain

 

[brimck325]

it's called bottlenecking.

 

[Prop215Life]

What does that mean ?

 

[Prop215Life]

Do you think "bottle necking" will have a adverse effect on cannabis