Asparagus

Asparagus is a long-lived perennial vegetable producing tender young shoots harvested as either white or green spears. It is hardy throughout Sweden and resistant to common fungal diseases including asparagus rust. Plants require a two-year establishment period before the first harvest, but once settled, a well-managed bed produces abundantly for decades. Full sun and deep, well-drained soil are essential.

Growing

Soak seeds overnight before sowing. Start seeds indoors in a greenhouse or cold frame, sowing 1–2 cm deep when the germination environment can be kept at 18–20 °C. Germination takes 14–30 days. Grow seedlings on for at least two full growing seasons (nursery bed) before transplanting to the permanent bed. When transplanting, open furrows 20–25 cm deep and spread the crown roots out fully; set plants 30–40 cm apart within the row. Space rows 120–200 cm apart — use the wider spacing for white (blanched) asparagus, which requires heavy earthing-up.

Care

Keep the bed weed-free, especially during establishment — asparagus does not compete well with weeds. Apply a balanced fertiliser each year after harvest and again in autumn to feed the crowns. For white asparagus, mound soil progressively as shoots emerge to exclude all light. Water consistently in dry spells during the growing season but avoid waterlogging. Cut down yellowed ferns to ground level once they have died back completely, but allow them to stand until fully dry as they feed the crowns.

Harvest

Do not harvest at all in the first two years after transplanting from seed — allow all spears to develop into ferns to build crown reserves. In the third year a light harvest of a few spears per plant is acceptable. From the fourth year onward, harvest spears when they reach 15–20 cm tall and the tips are still tightly closed. For green asparagus, snap or cut spears at soil level. For white asparagus, cut below the soil surface as soon as the tip begins to break through. Stop harvesting once spear diameter drops noticeably and allow the remaining shoots to fern out for the rest of the season.

In the kitchen

Asparagus spears are best eaten as fresh as possible. Snap off the woody base where the spear naturally breaks, then steam, boil briefly, roast, or grill until just tender. Green asparagus pairs well with butter, lemon, Parmesan, and eggs; white asparagus is classic with hollandaise, cured ham, and new potatoes. Both colours work in risotto, pasta, stir-fries, and as a side vegetable.

Storing

Store unwashed spears upright in a jar with 2–3 cm of cold water, loosely covered, in the refrigerator — this keeps them fresh for up to 4 days. Alternatively, wrap the cut ends in a damp cloth and refrigerate. For longer storage, blanch spears for 2–3 minutes, cool in ice water, drain, and freeze in a single layer before bagging — use within 8 months.