Asparagus bed in Late May....aren't you tempted?
The drill for asparagus is that you buy crowns that are one to two years old; the older crowns are worth it, IMHO, because you can harvest lightly by the very next season.
In good soil, one would dig a trench to start a bed, but in the case of poorly draining, dense soil, (the kind I always seem to end up with,) the idea is to build a raised bed and essentially put in the crowns at ground level. My bed is 32' by 4' and 12" deep. I mixed sand, compost, and soil in equal amounts, and covered the crowns; then as the sprouts grew, I mixed more and filled in.
I had a load of compost and a load of sand delivered and mixed them in a wheelbarrow bed; I had a big pile of soil from putting in a driveway.) In Ohio, that task of filling in took most of the summer; in Arkansas, I was mixing and covering every other day and the bed was completed in a month; (so were my wrists....but I was doing drywall mud every day, too.) The recommended soil depth is 12 inches above the crowns, by the end of the process. Then over time you can add sand and manure on occasion, (and a mulch such as shredded leaves is not a bad idea when the bad heat hits. Theoretically this can also help prevent weeds that compete with your asparagus.) I had my asparagus in Ohio at the side of the garden, with lower pathways for drainage on either side; asparagus does not care for wet feet. Hubby Dearest tilled the rest of the garden and left raised ridges for the rest of the veggies. After 10 years I had really nice soil, great tilth....it was still clay, of course, but easier to work with. (Then we moved away...)
When the bed was sparser, I didn't have trouble seeing the perennials behind the asparagus bed. Now the ferny stalks hide the plantings. This works well when the bed is full of spent daffodil and narcissus foliage, but in the case of the Shastas and the echinacea and lavender, I am not quite as pleased to be deprived of the pretty blooms.
Another happy benefit of your asparagus bed: you can use the shady space under the foliage for lettuces or mixed greens. This year my 'underplanting' includes a few bean plants, which are replacing 'Salad Rose' radishes planted in early March. I'll put in some additional mesclun mix; some of it will bolt, slugs will get some of it, but this won't be wasted space. (Look carefully to see the lettuce and bean sprouts.)
Life's mysteries: why can't I get this space to accept the font I want? I 'fixed' it by highlighting UPward, then changing the font back to Ariel. It wouldn't work in the other direction. (grumble, grumble.)