Plant library · Vegetables
Rheum rhabarbarum
Rhubarb is a long-lived perennial vegetable grown for its tart stalks in spring and early summer. At about 3 feet tall and 3 feet wide, it needs a reserved place rather than a gap in an annually replanted bed. Use it where its broad seasonal presence can remain undisturbed, with enough sun and room to return each year. It is suited to USDA Zones 3 through 8.
Give rhubarb a permanent position at the outer edge or end of the vegetable garden, where digging, crop rotation, and seasonal bed clearing will not disturb its crown. Choose an all-day-sun location and keep it clear of nearby trees and shrubs that could cast shade as they grow. A side bed beside a path works well: it keeps the large clump accessible for harvest without forcing gardeners to step into surrounding annual plantings.[1][2]
Space plants 3 feet apart, center to center. Each clump reaches about 3 feet wide, so map it as a full 3-by-3-foot occupied area rather than an undersized row crop. Keep the planting edge open to a path or bed aisle for harvesting and maintenance, and avoid squeezing annual vegetables into the clump’s expected footprint as it fills out.
Place rhubarb in full sun and provide regular water through the growing season. Well-drained soil is essential, so do not use a low spot where water stands or soil stays wet. If the intended bed is heavy or slow to drain, improve the planting area before setting the crown; a raised bed can help keep the root zone from remaining waterlogged.[1][3]
Rhubarb occupies its space for the full growing season even though harvest is concentrated in spring to early summer. New plants need time to establish: wait until the second season to begin harvesting, and allow plants started from seed until the third season. After the main harvest, leave the foliage in place to rebuild the crown for the following year rather than converting the area to a summer crop.[1][4]
Editorial content updated 2026-07-20.