Buy one of the all male varieties if you can. The spears are larger, and you won’t have problems with volunteers. In asparagus beds, volunteers are the worst weeds.
When I grew it, the seedlings never amounted to anything, never produced decent crowns. I concur with getting the all-male varieties. The seeds if you get them are quite visible, makes them easy to remove if they show up.
I had a similar experience with Jersey Giant from Simmons. Supposed to be males but half ended up being female and I pulled them up. Just bad luck I guess. Ordering more this year to fill in.
I’m no expert by any means on this, but I dont mind a few females in my beds. Growing from seed opens up some options. For instance I grew Conover’s Colossal from seed last year and by the end of the summer they looked as good or better than some store bought crowns of M.W. and J.K. When I collect seed from females in my beds I can grow out new seedlings at my leisure and expand into new beds or give free plants away whenever I want. The seedlings might not be as productive as the all male hybrids, but you can just plant more plants if you have the space. All of what I said goes out the window if you’re growing to sell or are trying to squeeze the most out of a small garden.
I started my plants from seed, but it will set you back a year or two. I got my seed off ebay.