In my garden last year, the beds were 90% compost, 10% other stuff. This year, I made it roughly 40% topsoil, 10% peat moss, and 50% compost. Everything grew pretty well last year, but after some research, I'm convinced my plants may have been missing some minerals from having a lack of regular soil in there. I still need to send in a soil sample to the extension office and get it tested. I guess topsoils vary a lot in ph and nutrients. It takes 3 weeks to get back results so hopefully meanwhile what I planted will grow as long as the ph isn't too far off. I just direct seeded some lettuce so I'll see if it comes up ok. If it doesn't I'll have to buy a test from the store to make quick changes!
Before I amended my beds, I did plant a few things. They seem to be growing nicely. I hope the topsoil addition isn't a mistake!!