How to Grow Rhubarb
Rheum × hybridum
A jewel-stalked perennial “fruit vegetable” that returns bigger every spring for decades.
By the Plants by Zone Editorial Team · Reviewed June 1, 2026
About rhubarb
Rhubarb is a cold-hardy perennial grown for its intensely tart stalks — the backbone of pies, crumbles, and jams — and once established in rich soil it can produce reliably for 15–20 years with very little attention. It demands cold winters for dormancy and genuinely improves with age as the crown expands into an ever-larger clump. One critical rule: the large, glossy leaves contain enough oxalic acid to be toxic, so only ever eat the stalks.
When to plant and harvest rhubarb
Timing is relative to your frost dates. Find your USDA zone for exact dates, or browse the month-by-month calendars.
Start seeds indoors
Not needed — plant dormant crowns or divisions
Transplant outdoors
Early spring while dormant, or late fall
Direct sow
Not recommended
Harvest
Spring through early summer; stop by midsummer each year
How to grow rhubarb step by step
- 1
In early spring or late fall, plant bare-root crowns or divisions 3–4 ft apart with the buds set just 1–2 in below the soil surface — too deep delays sprouting.
- 2
In year one, let every stalk grow undisturbed; the crown needs the full season to build a substantial root system.
- 3
In year two, harvest sparingly: pull just a few of the thickest stalks over no more than two weeks, then stop.
- 4
From year three onward, harvest freely for 6–8 weeks each spring, grasping each stalk near its base and pulling outward with a gentle twist to snap it cleanly from the crown.
- 5
Stop all harvesting by midsummer — the remaining stalks must rebuild the root reserve for next year’s crop.
- 6
Snap off any flower stalks the moment they appear so the plant doesn’t divert energy into seed. Top-dress with a generous layer of compost in fall and divide congested clumps every 8–10 years in early spring.
Common problems growing rhubarb
⚠ Crown rot or soft, mushy base
Almost always caused by waterlogged soil or planting the crown too deep — grow in raised beds if drainage is poor and keep the buds near the surface.
⚠ Flower stalks appearing repeatedly
Cut them off promptly every time; frequent bolting on a mature plant often signals that the crown is congested and due for division.
⚠ Thin, weak, or few stalks in later years
The crown is aging or crowded — lift and divide in early spring, replanting the outer vigorous sections into refreshed, compost-rich soil, and discard the woody center.
⚠ Poor performance in warm zones
Rhubarb needs cold winters to go dormant and break cleanly. In zones 8 and warmer it often weakens over time; give it afternoon shade, choose heat-tolerant varieties, and mulch the crown in summer.
✓ Good companions for rhubarb
✗ Keep away from
🧺 Harvesting rhubarb
Grip each stalk at the very base, pull outward and twist, and it snaps free cleanly — cutting the stalks with a knife allows the stub to rot, weakening the crown over time. Never take more than a third of the stalks at any single harvest; leave the smaller inner ones to keep the plant photosynthesizing. Strip off the large leaves immediately and compost them, as their high oxalic acid content makes them toxic to people and animals. Stalks are most tender and flavorful when pulled in the cool of spring before the heat arrives.
Rhubarb: frequently asked questions
When should you plant rhubarb?＋
In most regions you transplant early spring while dormant, or late fall. Timing is relative to your last frost, so find your USDA hardiness zone for the exact planting dates where you live.
Are rhubarb leaves poisonous?＋
Yes — rhubarb leaves contain very high levels of oxalic acid and are toxic to humans and animals. Only the stalks (petioles) are edible; always strip and compost the leaves immediately and never add them to juice or cooking.
Why can’t I harvest rhubarb the first year?＋
A newly planted crown needs its entire first growing season to build a strong, deep root system. Pulling stalks too soon stunts the plant permanently. Patience in year one and restraint in year two sets you up for decades of abundance.
Grow rhubarb in your zone
See exactly when to plant and what else to grow alongside rhubarb, tailored to your USDA hardiness zone.
