Description

The Perennial Treasure, Ancient Abundance and the Asparagus of Timeless Generosity

Mary Washington asparagus is a promise you plant once and keep collecting for years. In early spring, when the garden is still half-dreaming, and the soil is just beginning to soften, it sends up spears like green candles. They’re slender, calm, and luminous, tipped with a faint wash of purple as if dawn brushes them on its way through. It is one of the most romantic vegetables you can grow because it asks for patience and rewards you with permanence: a living bed that returns, faithfully, with the first authentic taste of spring.

There’s a particular kind of abundance in asparagus, not the fast, frantic kind, but the steady generosity of a perennial crown that grows stronger with every season. Let it establish, tend it well, and it will feed you for decades: tender spears for the table, feathery fern-like foliage for the garden’s beauty, and the quiet satisfaction of cultivating something that outlives trends and keeps its word.

A whisper of history

Asparagus is an ancient Mediterranean and Middle Eastern delicacy, treasured by the Greeks and Romans and cultivated in monastery gardens and on aristocratic estates for centuries.

Mary Washington is a North American classic developed in the early 20th century through USDA selection, prized for vigorous crowns, excellent spear quality, and strong disease resistance (notably to asparagus rust). It became a beloved standard because it does what perennial crops must do: endure, return, and provide.

What You’ll Grow

• Plant type: Long-lived perennial vegetable
• Height (fern stage): typically 120 to 180 cm (4 to 6 ft)
• Spread: typically 60 to 90 cm (2 to3 ft)
• Spears: Vibrant green with occasional purple blush at tips; tender and succulent when harvested young
• Flavour: Delicate, slightly sweet, unmistakably spring
• Longevity: commonly 15 to 20+ years in a well-sited bed

Time to harvest:

• Light harvest begins in year 2
• Full harvest begins in year 3 and continues for many years

Growing Instructions

Asparagus is a long-term investment. The goal is to build strong crowns and deep roots first, then harvest for decades.

Timing

• Plant in spring as soon as the soil can be worked
• You can start from seed or plant one-year crowns (faster)

Starting from Seed (Slow, but Satisfying)

• Start 8 – 10 weeks before the last frost indoors
• Sow 6 mm (1/4 in) deep in seed-starting mix
• Keep warm: 21 – 24C (70 –  75F)
• Germination: 10-21 days
• Provide bright light after emergence
• Grow seedlings until 8-to 12-week-old with strong roots
• Harden off 7-10 days before transplanting

Planting from Crowns (Recommended for Faster Harvest)

Crowns establish more quickly and usually bring you to harvest sooner.

Site Selection (Choose Once, Choose Well)

• Full sun: 6-8+ hours daily
• Drainage is critical: asparagus will not tolerate waterlogged soil
• Avoid low spots where spring meltwater sits

Soil Preparation (This Is Where the Magic Happens)

Because asparagus can live in place for decades, soil prep is everything.

• Work in generous compost or well-rotted manure
• Aim for fertile, well-drained soil with good organic matter
• Raised beds are excellent in heavy soils

Trench Method (Classic Asparagus Planting)

1. Dig a trench 20-30 cm (8-12 in) deep and about 30 cm (12 in) wide
2. Space trenches 120-150 cm (4-5 ft) apart
3. Create a low ridge of soil at the bottom of the trench
4. Set crowns on the ridge and spread roots outward like a star
5. Cover with 5-8 cm (2-3 in) of soil to start
6. As shoots grow, gradually backfill the trench over the season until level

Spacing

• In-row spacing: 30-45 cm (12-18 in)
• Row spacing: 120-150 cm (4-5 ft)

Watering

• During establishment, keep moisture consistent
• Provide 2.5-5 cm (1-2 in) of water per week
• Once established, asparagus is more drought-tolerant, but yields improve with steady moisture

Feeding

• Spring: compost top-dress or balanced fertilizer as spears begin to emerge
• After harvest ends: feed again to support fern growth and crown energy storage

Weeding (Be Gentle)

• Weed competition hurts young crowns
• Hand-weed carefully to avoid damaging shallow roots
• Mulch helps enormously

Mulch

• Mulch conserves moisture, suppresses weeds, and protects crowns in winter
• Especially helpful in Canadian climates for freeze-thaw protection

Disease Notes

Mary Washington is known for strong resistance to asparagus rust, but good airflow and clean beds still matter.

Harvesting (The Rules of Perennial Generosity)

Year-by-Year Harvest Plan

• Year 1: Do not harvest. Let all spears become ferns.
• Year 2: Harvest lightly for 4-6 weeks (a few spears per plant).
• Year 3+: Full harvest for 6-8 weeks in spring.

When to Harvest

• Harvest spears at 20-25 cm (8-10 in) tall
• Tips should be tight and closed
• Snap at ground level or cut just below the soil surface with a sharp knife

When to Stop

Stop harvesting when spears become thin and spindly. Let the remaining spears grow into ferns. This is how the crown stores energy for next year.

Preserving + Storage

• Fresh: refrigerate spears (upright in a jar with a little water, or wrapped) and use within 3-5 days
• Blanch + freeze: best for long-term storage
• Pickle: classic for crisp spears
• Roast + freeze: roast, cool, and freeze in portions for quick meals

Culinary Notes: The Taste of Spring

• Steamed: 3-5 minutes; finish with butter and lemon
• Roasted: olive oil, salt, pepper; roast until lightly caramelized
• Grilled: smoky char makes the sweetness sing
• Hollandaise: the classic pairing for a reason
• Pasta and risotto: folds in beautifully with cream, lemon, and herbs
• Egg dishes: frittatas, omelets, quiche
• Blanched + chilled: serve with vinaigrette for a bright spring plate

Canadian Climate Notes

Mary Washington is one of the best choices for Canadian gardens because it is cold-hardy and long-lived.

• Plant in spring as soon as the soil can be worked
• Prioritize drainage and deep soil preparation
• Mulch for winter protection and to buffer freeze-thaw cycles
• Let ferns entirely yellow/brown before cutting back in fall (they feed the crown)

Growing zones: 3-11 (perennial).

Nutrition Notes (Quietly Powerful)

Asparagus is nutrient-dense and famously spring-clean.

• Excellent source of folate
• Provides vitamins C, K, and A
• Contains antioxidants, including glutathione
• Contains inulin (a prebiotic fibre)
• Naturally low in calories and high in water content

Seed Saving

Asparagus is dioecious: there are separate male and female plants. Only female plants produce seed (berries).

How Seed Forms

• Plants flower in late spring/early summer
• Female plants form small berries that ripen to red

How to Save Seed

1. Please choose at least one healthy female plant and allow it to grow without harvesting
2. Let berries ripen fully until bright red
3. Harvest berries and crush them in water to release seeds
4. Rinse seeds thoroughly to remove all pulp
5. Dry completely on a paper towel in a warm, airy place
6. Store cool and dry

Isolation & Cross-Pollination

• Asparagus can cross with other asparagus varieties
• For true seed, isolate by distance (as practical) or allow only one variety to flower

Seed viability: 3-4 years