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Mary Washington Asparagus (Asparagus officinalis) produces thick, straight green stalks with a hint of purple at the spear. Asparagus takes up to 3 years from seed to produce stalks, but will last for decades after becoming established. Germination can be tricky, but the harvest is so worth it! The flavor of Asparagus is one of a kind and wonderfully delicious.
Start indoors 12-14 weeks before last frost date. Soaking seeds and warm temperatures aid germination; it can take up to two months, so be patient. Harden seedlings for a week before transplanting 12" apart to a sunny spot with well-drained soil.
Mary Washington Asparagus Seeds Growing Details | |
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Botanical Name | Asparagus officinalis |
Plant Spacing | 4-6” |
Planting Depth | 1/2” |
Spread | 30” |
Height | 3-4’ |
Germination Temp | 75-85 °F |
Light Required | Full Sun |
Life Cycle | Perennial |
Days to Germination | 10-56 Days |
Time to Maturity | 2-3 Years |
Planting Zone | 4-9 |
Yield | High |
Growth Rate | Slow |
Growing Season | Spring - Fall |
Harvest Season | Spring |
Asparagus seeds will germinate in 10 to 56 days. Soaking the seeds before planting can speed up the process. Once the seeds have started growing, you should wait until the 3rd spring before harvesting any spears. This will give the asparagus plants a thriving root system for better harvests every year.
Over-harvesting asparagus can prevent your plants from growing new spears the next year. Always leave some ferns to grow so they can store up energy for another spring crop. Another possible reason for asparagus to not come back is if the crown died from being too cold or from damage caused by insects or disease.
White asparagus stays white because of “blanching.” This is a process of growing the asparagus and covering the emerging spears so they don’t get any sunlight. It results in an interesting but less nutrient-dense vegetable.
When female asparagus plants mature, they will focus their energy towards producing berries with seed. Pick the berries when they turn red in the late fall. Squish the berries and separate the seeds by rinsing with water. Seeds will need to set out to dry for several weeks. Once they are fully dry, store them in a cool, dark location to plant again another season.