Asparagus can be started from seeds or crowns. Plants grown from seed commonly produce a larger number of slightly bigger and more tender spears.
Set out seedlings 12-inch seedlings 4 weeks after the last frost. Sow seeds indoors 12 to 14 weeks before planting out. Soak seeds overnight in tepid water to improve germination.
Plant crowns 2 to 4 weeks after the date of the average last frost. Plant the largest one-year-old crowns you can find.
Set seedlings and crowns in trenches 6 to 10 inches deep. Cover crowns with 2 inches of soil; mound soil around the base of seedlings. As shoots grow, add soil until the trench is filled to ground level.
Asparagus is a long-lived plant; it can produce spears for 15 to 25 years. Plant asparagus in a bed you can dedicate to their growth for several years.
Asparagus seedling transplant dates*
* Sow seeds indoors 12-14 weeks before planting out
(These dates are for the Northern Hemisphere)
|Average date of the last frost||Planting dates|
|Mar. 10||Jan. 1-Mar. 1|
|Mar. 20||Feb. 1-Mar. 10|
|Mar. 30||Feb. 15-Mar. 20|
|Apr. 10||Mar. 10-Apr. 10|
|Apr. 20||Mar. 15-Apr. 15|
|Apr. 30||Mar. 20-Apr. 20|
|May 10||Mar. 30-Apr. 30|
|May 20||Apr. 20-May 15|
|May 30||May 1-June 1|
|June 10||May 15-June 1|
Asparagus planting details
- Sowing depth: ½ inch (1.2 cm)
- Space between plants after thinning: 12-18 inches (30-45cm)
- Days to sprout: 7-14
- Days to harvest: 3 years
- Storage period: 3-4 weeks
- Seeds per 100 row feet: 1 ounce (14 grams)
- Yield per 100 row feet: 30 pounds
- Suggested varieties: Viking, Waltham, Washington
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