18+18 is 36, or this strain vary a lot between thc and cbd in each seed, or this is scam.
I do suggest getting a pretty stable plant, from a good seedbank. As thc seed are well spread all over the seedsbanks, they are trustworthy nowadays, but CBD is new, there are company launching them without an stable historic... I would get something from dinamed, cbd seeds, anything with a history behind cbd. And with a good historic of reviews, over here and over the seedbank site itself.
Also I do suggest you looking for your goal on weed, so you can find the best terpene profile, or sativaindica dominance, so you can find the best strain!
Wish you a great travel all over the internet!