Asparagus can be grown at high altitudes (there are varieties that are more cold hardy, such as ‘Martha Washington’ or ‘Jersey Supreme’)—just be sure it is protected from frost and over winter (crowns buried at a proper depth), and mulch to help to keep soil moist. Because yours are in a raised bed, I’m guessing the soil is new and has the proper nutrients and soil pH? Otherwise, test the soil for pH balance and nutrients and amend as necessary (but choose amendments that will not burn the planted crowns). Do not harvest the first year, and only very lightly if at all during the second. For other tips, you might ask your county’s Cooperative Extension. Contact information can be found starting here http://www.almanac.com/content/cooperative-extension-services
Hope this helps!
Asparagus can be grown at high altitudes (there are varieties that are more cold hardy, such as ‘Martha Washington’ or ‘Jersey Supreme’)—just be sure it is protected from frost and over winter (crowns buried at a proper depth), and mulch to help to keep soil moist. Because yours are in a raised bed, I’m guessing the soil is new and has the proper nutrients and soil pH? Otherwise, test the soil for pH balance and nutrients and amend as necessary (but choose amendments that will not burn the planted crowns). Do not harvest the first year, and only very lightly if at all during the second. For other tips, you might ask your county’s Cooperative Extension. Contact information can be found starting here http://www.almanac.com/content/cooperative-extension-services
Hope this helps!