Anna-Janswered grow question 1mo ago I was in a similar situation, coming back from a few years of not growing and unsure of what strains I wanted to grow. I ended up re-starting my small tent setup with a strain that had been in storage at the back of my friends fridge for the past 3 years. I didn't want to spend money on new seeds until I was sure that all of my equipment was functioning normally and just to get a "feel" for how things would go.
I did end up getting some high THC auto and photo strains from FastBuds, although they were freebies that I won in the recent "Boudoir" photo contest here at Grow diaries.
If you have space for 20-30 plants, then you have lots of options! Are you planning to run different strains at the same time or would you be running a single strain?
You might want to determine if you're more interested in sativa-dominant or indica-dominant strains and in my case, I was looking for strains that tended to be less tall and more compact due to my tent size.
I assume that if you have room for 30 plants, that size is not an issue for you.
I'm sorry that I don't actually have any strain suggestions for you but when I was searching some of the seed company websites, most of them made it easy to search for strains based on various criteria.
Another thing I did was to find a strain I was interested in and then try to find diaries for that strain here on the site. Sometimes the seed companies market a strain as high yielding and fast flowering but then you find diary after diary of people not having great outcomes, or where some people's plants finish after 9 weeks and others finish after 14 weeks... Same strain but just different grow situations.
I like finding people here who have similar lights to mine and similar grow setups and seeing what strains have worked well for them.
Autos seem to have really come a long way over the past decade and most recently developed strains are much stronger and stable than some of those early auto strains that were around when I first got into auto flowers.
Anyways, best of luck with whatever you choose! 😊✌️