It's definitely true, but you have to trust that what you're getting is legit. For example I do 2 strains that are considered very easy. LA Confidential and Juicy Fruit. LA Confidential is particularly known to be mildew resistant. I had a pretty bad outbreak of Powdery mildew and it was heavy on my JF. The LC got it a little bit, but responded exceptionally well to treatment. These are the kind of issues that make a strain easier to grow. For example something like Grand Daddy Purps or another Big Bud cross with very dense large buds are considered to be very prone to mildew. Mildew is just one aspect to look at. Certain strains will be less strict on the environment you subject them to, and other strains are particularly resistant to bugs and disease.I consider myself new took growing because all I have ever done is bag seeds...i was told that diff seeds are for did level of growers..so with me being what I call a newbie I was concerned..