Knott free pinus radiata

I was wondering if someone could help me is it actually possible to get knott free pinus radiata like the stuff thry sell at bunnings but better? Sure you would pay more for it etc understandably but what im not sure on is how the get knott free in the first place given every tree has extra limbs and branches. Is there someway we can control the way a tree grows or is it specific species of pine that grows without knotts and is overall better quality?



Might seem like silly suggestions I made but genuinly dont know so thought someone on here may know.



Cheers

Delbs