hello people,

This is probably a dumb ass question.
What is ppm?
I know it stands for parts per million. But does it have any relevence to the numbers on plant food ie 20-10-20 etc

In hydroponics can you just put an off the shelf nutrient like miracle grow in the water at the correct levels or must you use what to me seems complicated ferts.
Thanks for any help you can give
Cheers
colliefish Reviewed by colliefish on . ppm question hello people, This is probably a dumb ass question. What is ppm? I know it stands for parts per million. But does it have any relevence to the numbers on plant food ie 20-10-20 etc In hydroponics can you just put an off the shelf nutrient like miracle grow in the water at the correct levels or must you use what to me seems complicated ferts. Thanks for any help you can give Cheers :D Rating: 5