I know of a strain that is 14-20% CDB and less than 1% THC. Also many autoflowering strains have a high CBD like 12%THC and 4% CBD
Have you considered
naming these strains so that anyone reading this thread can look for them?
As already mentioned earlier in this thread, well known high CBD strains include:
Harlequin, Cannatonic, Sour Tsunami, and various ones from CBD crew (EG CBD Skunk, CBD Widow, etc).
There is one called Juanita la Lagrimosa that is about 1.2:1 CBD:THC from Sensible Se-eds.
Supposedly the clone only Raskal OG has a similar cannabinoid profile, and there are a few well know drug strains that can also have appreciable levels of CBD (like LA confidential).
There is one out there called "Ruby Slippers" that's got a high CBD level.
Avideckel is one that's virtually all CBD with negligible THC, though this was developed in a research setting in Israel, and I don't know how available it is, even there.
One key point is that with many if not most of these strains, the plants will put out various phenos, and typically only 1 in 4 of them will be high CBD/low THC.
If you're growing a clone of a tested/known plant then you're fine.
But if you're growing FROM SEED, this is potentially a problem, because unless you have your own plants tested, it may be difficult to impossible to identify the ones that are rich in CBD. Typically these sorts of plants will also put out individual phenos that are 2:1 CBD/THC, and mostly THC. Testing is expensive, but it can be done on plants still in veg stage, so you don't necessarily have to waste your time flowering out plants that won't give you desirable levels of CBD.
Again, from a practical perspective, if you're in a medical state, the simplest/best thing to do is probably just to find a clone of a plant known to have whatever CBD profile you're interested in. That cuts out a lot of hassle in gambling with variable CBD genetics.