It sounds like its probably the Martha Washington variety. It is known for its resistance to asparagus rust, and other issues.
It produces uniform size , thick green shoots with tightly folded purple tips , and is known for heavy yield.
It prefers a rich soil , preferably with good drainage.
Similar to other asparagus varieties , you can expect a good harvest from 3 year plants, with the harvest generally lasting three months from late April through June.
It sounds like your 'whim' was a good one !
great! I hope it makes it.