I want to plant Invincible Mini Mauvette Hydrangas along with Sweetly Japanese Anemones and Autumn Frost Hostas. What kind of soil would I need?
The plants you mention will perform best in a soil rich in organic matter and nutrients. You can blend in humus or aged manure for organic matter and Espoma Bio-tone for nutrients and beneficial soil organisms. The area should be well drained as well.
More on Bio-Tone HERE: https://www.espoma.com/product/bio-tone-starter-plus/#tab2