How to Grow French Sorrels USA | Planting & Establishment

Growth Stages

Stage	BBCH	Notes
Sowing and planting	0	RHS: sow seed indoors in spring or outdoors mid-spring to early summer, about 1cm deep, germinating in 1-2 weeks at 15C; plant out young stock 20-30cm apart. NC State: seed sown in the garden in early spring, about 1in deep; the plant self-seeds readily.
Establishment	3	RHS: water newly planted stock through dry spells until well-rooted; container plants need regular moisture checks; apply an annual mulch in late winter or early spring.
Leaf production	3	RHS and NC State both advise removing flower stems promptly to keep the plant channelling energy into fresh leaf growth rather than seed.
Harvest and division	8	RHS: harvest young leaves spring through autumn, picking regularly to keep growth tender; divide established clumps every four to five years to maintain productivity.

Quick Facts

Factor	Value
Sunlight	4-8 hours direct sun
Minimum survivable temp	-20C
Drainage	Rich, fertile preferred, tolerates most well-drained soil (RHS); NC State: average, medium, well-drained.
Lifecycle	Low-growing, mat-forming herbaceous perennial. RHS rates it H6, hardy across all of the UK and northern Europe. NC State gives USDA zones 4a-9b.
Edible parts	leaves

At a Glance

Harvest & Storage

When to pick: RHS: gather young leaves from spring through autumn; regular harvesting promotes tender new growth. NC State: young leaves taste better than older ones.

Storage

Best used fresh; leaves owe their tart flavour to oxalic acid, so NC State flags moderating quantities eaten (concern noted specifically for pets/livestock).

Pests

Aphids

low

Aphididae (various spp.)

RHS: occasional visitor to young foliage, rarely needing treatment. NC State reports no known pest problems.

Snails

low

Gastropoda (snails, various spp.)

RHS: occasional visitor to young foliage, rarely needing treatment.

Slugs

low

Gastropoda (slugs, various spp.)

RHS: occasional visitor to young foliage, rarely needing treatment. NC State reports no known pest problems -- a mild disagreement kept honest rather than merged.

French-sorrel, Seed to Harvest

A low, sprawling habit

RHS describes French sorrel as low-growing and mat-forming, spreading to about a metre wide -- much wider than it is tall.

Foliage with flower spikes

RHS and NC State both advise removing flower stems promptly to keep the plant producing tender new leaves rather than seed.

A dense ground-covering mat

Left to spread, French sorrel forms a dense, weed-suppressing mat -- useful groundcover as well as a salad crop.

The shield-shaped leaf

The grey-green, shield-shaped leaves are the clearest way to tell French sorrel apart from the taller, arrow-leaved common sorrel already in this database.

Leaves up close

RHS describes the leaf tips as pointed or rounded depending on the plant -- both forms are considered true French sorrel.

Flowering spikes

Like common sorrel, French sorrel sends up slender flowering spikes if left unpicked -- best removed promptly if the goal is a steady leaf harvest.

A single leaf

The citrus flavour RHS describes comes with a genuine caution both sources share: the tartness is from oxalic acid, best eaten in moderate quantities.

Growing on rocky ground

NC State notes the species is drought-tolerant once established and does not need especially rich soil -- rocky, free-draining ground suits it well.

A naturally free-draining home

NC State gives a native range stretching from Europe to Southwest Siberia and south to Iran -- a wide range of dry, well-drained habitats like this one.

References

1. North Carolina State University Extension (Plant Toolbox) - Rumex scutatus (Buckler Leaved Sorrel, French Sorrel, Garden Sorrel, Narrow-leaved Dock, Spinach-Dock)

   Light: full sun or partial shade. Soil: average, medium, well-drained, tolerates clay/loam/sand across acid-alkaline pH. Size: 1.5-2ft height, 1.3-3ft spread, low-growing clump. Hardiness: USDA zones 4a-9b. Native range: Europe to Southwest Siberia, south to Iran. Propagation: seed, self-seeds readily. Pests/diseases: none documented. Edibility: leaves used in salads, soups and sauces, tart flavour from oxalic acid; remove flowers promptly to keep leaf production going. Toxicity: flagged as a concern for cats, dogs and horses; can cause contact dermatitis. Growing notes: drought and wind tolerant once established, does not tolerate maritime salt, low maintenance, medium growth rate.

2. Royal Horticultural Society - How to grow Sorrel (French sorrel section) / Rumex scutatus

   Hardiness H6 (-20 to -15C, all of UK and northern Europe). Identification: grey-green, juicy, citrus-flavoured, shield-shaped leaves with pointed or rounded tips; low-growing, mat-forming, 15-45cm tall, spreading to ~1m. Soil: rich, fertile preferred, tolerates most well-drained soil; full sun or partial shade. Planting: young plants spring to early summer, 20-30cm apart, same depth as previously grown. Containers: at least 30cm wide/20cm deep, 50:50 soil-based and multi-purpose peat-free compost. Propagation: seed sown indoors in spring or outdoors mid-spring to early summer, ~1cm deep, germinates 1-2 weeks at 15C; divide every 4-5 years. Care: water newly planted stock in dry spells, annual mulch late winter/early spring, remove flower stems to keep leaf production going. Harvest: young leaves spring through autumn, regular picking encourages tender new growth. Pests: slugs, snails, aphids on young foliage, rarely needing treatment. Diseases: generally disease-free. Safety: potentially harmful if consumed in large quantities.

2 independent sources are cited for this crop. Where they disagree - soil pH is the clearest case - every figure is preserved rather than averaged into false precision.