So I am extremely limited in numbers, I still live in a very illegal state so I grow two plants just in case I do get caught, I can point out it is just for personal consumption- which it is.
Because of this I started planting 4 seeds of a regular line, or two of a feminized line. I will reduce to two once they start flowering. However, I do find just smoking on the one strain causes a bit of burnout so this run I am changing things up altogether- both in growing style and having several different cultivars going. I germinated one of each strain- this totally goes against whether I can judge a strain or not, but I am hoping the one plant will give me a rough guide on if its a line I want to explore further. So that is the answer to your first question, one plant isnt enough to judge a cultivar, but it will give me an idea on if its a line I want to explore.
For germination, I honestly have an extremely successful rate, but again I am going to have to change this up next run. I normally soak the seeds in a shot glass of water for 12-24h, then put in a paper towel in a plasic sandwich bag and then place it in a warm area, like a hot airing cupboard. I've had around a 95%+ germ rate doing it this way. However, I have moved from living soil to hydro, and germinating them via paper towel and placing the seedling into a rockwool cube didnt work that well for me. I managed to break the taproot on three of the four seedlings whilst doing so. Fortunately they are fine now, I did lose one that was a slow developer anyway, but the rest have recovered now.
In the future I will soak for 12-24h hours, but will probably put the seed straight into a cube or do the paper towel method, but hang the baggie so gravity can straighten out the taproot.