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Rhubarb Crown Calculator — Spacing & Yields
Work out spacing and yields for rhubarb crown planting.
Total length of the bed or row available for crowns
Bed depth front-to-back; rhubarb needs ~0.9 m each way
Standard 90 cm, compact 75 cm, giant 120 cm spacing
Unit price for cost estimation
Adjust yield for soil and conditions (default 1.0)
How We Calculate This
Crowns = plants that fit along length x plants that fit along width, based on the recommended spacing for the variety.
Standard varieties: 90cm apart. Compact: 75cm. Large: 120cm. Rhubarb needs plenty of space to develop strong crowns.
Yield estimates are for established plants (year 3+) over a typical April-June harvest season.
Frequently Asked Questions
November to March while dormant. Bare root crowns are planted in winter. Container-grown crowns can be planted any time but establish best in autumn.
Do not harvest in the first year. Take a light harvest in year two. From year three onwards, harvest freely from April to June.
Rhubarb plants are very long-lived perennials. Well-maintained crowns produce for 10-15+ years. Divide crowns every 5-6 years to maintain vigour.
Yes. Cover crowns with a forcing pot or dark bucket in January. Forced stems are ready 4-6 weeks earlier, with a sweeter, more delicate flavour.
Do not harvest in the first year after planting. Take a light harvest in the second year. From the third year onwards, harvest freely from April to June.
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Last updated: February 2026
All calculations are estimates based on standard gardening guidelines. Results may vary with soil conditions, climate, and plant varieties.