Your school friends are wrong. The plant wouldn't grow properly without nutrients.
Your friend was probably growing in a potting soil that has sustained release fertilizer or in the ground.
Organic and chemical nutrients act differently. Organics need to be broken down by the soil micro organisms before the plant can uptake them. Chemical nutrients are absorbed by the roots without the requirement of being broken down.
If you flush your plant with plain water for the last couple of weeks then it will be as clean if not cleaner than anything you would normally buy. Some growers don't flush at all.
Just get yourself an all round 100% organic liquid fert. Use 1/2 the dosage that the product recommends.
Something is better than nothing.
The End.
elcheapo Reviewed by elcheapo on . Fertilizer... Hi, After talking to a few people, I noticed I should start using fertilizer. My plant is magic bud paradise and its been growing for about 3-4 weeks now. I was told to use a nitrogen based fert. Right now at my house I found something called: Schultz: 19-31-17 and Vigoro: All Purpose Plant food 19-6-12 Rating: 5