I have to be straight with you, man. Anyone who claims they have seeds that are guaranteed to be high CBD and low THC is either misinformed or bullshitting you.
There is going to be variability in CBD:THC ratios with the VAST majority of these strains - even the ones for sale at high prices from “reputable” breeders. The honest breeders post their test results from multiple plants, and the data always shows variability.
The only truly guaranteed way to get the ratio you want/need is to grow plants out, test them, and then clone the ones that test the way you want them.
Or, grow as many of the same plants as you can, harvest them, cure them separately, then test smoke the different plants and decide which ones provide the desired results.
Case in point: I grew out some Sweet Pure Auto CBD from Sweet Seeds. They claim 20:1 CBD:THC ratio. I can’t say for sure that’s the exact ratio, but my gut says it is. I smoke a whole joint and get no THC high whatsoever. I get a calming effect from the CBD that I have never felt quite that strong before, and if I smoke higher THC stuff after the CBD stuff, I don’t get anxiety like I usually do on just the THC or 50:50 stuff.
Another member (I forget who) bought and grew the exact same strain, and reported that the plant definitely wasn’t 20:1 and that it got him way higher than he expected. Neither of us is lying, and the next seed from my pack might grow into a plant that gets me high as fuck.
I’ve seen this time and time again. People buying “CBD” seeds and then getting high as fuck. CBD is a trend, and a lot of “breeders” are cashing in on it.
This isn’t to say you shouldn’t try, but don’t expect guaranteed results. Grow lots of plants, keep them separate and try them out. Better to take clones so you can re-grow them if you find something you really like.