I don't retain all of my length this year and I think it's due to trimming and braidouts. From now on, I'm with the Cathy Howse method (no trimming!) - I don't think trimming is necessary except for 1) getting rid of severely damaged hair (which I don't have), and 2)appearance. Her logic is that hair doesn't split evenly, so split ends break off to one side, and do not split all the way up the hair shaft. Also, when you trim, you simply expose yet another end that may inevitably split.
My hair retained the most length when I did weekly rollersets alternated with protective styling via phony ponytails, and used the Search and Destroy method instead of trimming/dusting. I also deep conditioned for long periods of time, often without heat.
ETA: I also did pre-poos with essential oils mixed w/conditioner, scalp massages, and the towel method of steaming. Man, I was so good to my hair. I worry too much about styling it lately when I need to just leave it alone.
My hair retained the most length when I did weekly rollersets alternated with protective styling via phony ponytails, and used the Search and Destroy method instead of trimming/dusting. I also deep conditioned for long periods of time, often without heat.
ETA: I also did pre-poos with essential oils mixed w/conditioner, scalp massages, and the towel method of steaming. Man, I was so good to my hair. I worry too much about styling it lately when I need to just leave it alone.