How many spears can I expect from an average asparagus plant ready for harvest?

Question

Pictures of young asparagus plants seem to indicate multiple spears will come from a single plant. But pictures of mature plants are harder to interpret.

I want to know so that I can determine how many asparagus plants I should plant.

Answer 1

From here, a mature asparagus crown will produce a half pound a year, which is about twenty spears a year per plant. A good rule of thumb is to plant ten plants for each family member.