Define the question a bit futher please. There are many perennials.

Hi Susie, I just looked at your member page, and it looks like you have ben growing from seed, and maybe are now going to try some bare root. I would recommend Scotts Metro Mix 510 to start. I've had good success with that, and it's readily available. Most perennials, hostas and grasses seem to do well in it. Good luck! Polly

Hi Susie,
I like Fafard mix #52, with 15/15/15 osmocote fertilizer mixed well into the media at a medium rate.

Most good perennial mixes will have a selected, processed, composted bark as a major component. The bark is screened to a certain size and adds to the porosity and air space within the mix. The mix should have been adjusted for PH by the producer.