asparagus

Survives zone 3 through 8

Harvest calendar

Ripens: Spears cut in spring for about 6–8 weeks, then growth is left to rebuild the crown

Best planted in early spring after your last frost, or in fall before the ground freezes, depending on your climate.

Young emerging spears eaten raw or cooked — the entire crop; grassy-sweet. ⚠ The red berries on female plants are not edible (mildly toxic) — only the spears are food.

Hardiness

Zone 3–8

Habit

Herb

Edible part

Shoot

Ripens

Spears cut in spring for about 6–8 weeks, then growth is left to rebuild the crown

Mature size

Herbaceous fern-like perennial to ~1.5 m when fronded

Light

Full sun

Soil pH

6.0–7.0

Environment

Temperate coastal

Native range

Europe, North Africa and western Asia, on sand dunes, riverbanks and coastal grassland — the salt tolerance of a genuine seaside plant, which is why old beds were once dressed with seaweed and salt.

Status

Cultivated

Years to fruit

2–3 yrs

Growth speed

Slow to establish — three years to a full cut, then twenty years of cropping

Spacing

45 cm (18 in) apart — about 4.9 per m² (4.6 per 10 sq ft)

Leaf shape

No true leaves at harvest size: what looks like fine feathery foliage is a mass of needle-like cladodes, modified stems doing the work of leaves. The real leaves are the papery scales on the spear.

Root system

A crown of thick fleshy storage roots at 15–20 cm with fibrous feeders running deep and wide — up to 2 m down on free soil. The whole crop is a withdrawal from that store, which is why cutting stops in June and the ferns are left standing to repay it.

Fruit description

Not a food: female plants carry small red berries in autumn which are mildly toxic and should not be eaten. They are the reason all-male F1 varieties are preferred — no berries, no self-seeding, and more spears.

Propagation

One-year-old crowns planted in a trench in spring are the standard route, and cost a year off the wait. Seed works and is much cheaper, but adds a season, and only F1 seed gives all-male plants.

Pollination

Dioecious — separate male and female plants; male plants are more productive of spears

The edible parts listed above are a starting point, not a field guide. Identify a plant with certainty — ideally against a local authority — before eating any part of it, and read the full disclaimer. Spotted something wrong? Report it.