What are some good asparagus varieties for home gardens in Iowa?

Question: 

What are some good asparagus varieties for home gardens in Iowa?

Answer: 

Asparagus is dioecious.  Dioecious plants produce separate male and female plants.  Male asparagus plants live longer and are more productive than female plants.  Excellent all-male asparagus varieties for the home garden include ‘Jersey Giant,’ ‘Jersey Knight,’ ‘Jersey King,’ and ‘Jersey Supreme.’  ‘Mary Washington’ and ‘Martha Washington’ are good standard asparagus varieties.  (A planting of ‘Mary Washington’ or ‘Martha Washington’ will include both male and female plants.)  ‘Purple Passion’ is a distinctive variety with purple shears.  

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