Territorial seed company has excellent instructions for asparagus. If I remember correctly, you don't get much if any of a harvest for a few years.

or larger, and only for four to six weeks in the Spring. Then let them grow to 'ferns'. I drove four foot post into the ground every four feet, and tie some line to support those 'ferns', and make weeding easier.

It does make a lovely fairy forest toward the end of the season, doesn't it?

Great climate. They hate to be moved, so if you must, the ferns must COMPLETELY die back (in the middle of February). I slanted my trench so that they would come up for a more prolonged season. They should be at least 1 foot deep, lots of organic matter and bone meal.

Don't worry if the ferns fall over if you're going for food. If you're going for decoration, the choice is all yours. I planted a couple for decoration like that last year and I have decided it was a planting error in my garden.

Bunnies like to hide among a nice patch also. I'm not sure about the replanting part. Haven't tried that yet, but we are going to try and move a few strays back to the main bed this year. They get a small lovely red berry as they mature. The berries will create new plants.

Don't try to eat anything before the third year. Just enjoy the feathery ferns and the wildlife it brings. After the third year, you can eat lots and still end up with a lovely fern garden. Be careful if you cut them down once they are dry and brown. They can give you a bit of a stab like cucumbers sometimes can. Nothing horrible, but surprisingly painful if you don't expect it.

Enjoy.