How to Grow Sorrel From Seed | Sowing, Care, And Harvest Tips

Sorrel is one of the most forgiving greens a gardener can start from seed, and how to grow sorrel from seed comes down to four things: timing, light, moisture, and spacing. Get those right and you’ll have a dependable crop of lemony leaves for salads, soups, and sauces for years, since sorrel is a perennial that returns each spring.

Because sorrel seeds need light to germinate, the planting depth is the detail most beginners get wrong. Bury them too deep and germination stalls or fails. The sections below walk through exactly when to sow, how deep to plant, and what the seedlings need to thrive.

When To Start Sorrel Seeds

Sorrel is a cool-season crop, so timing matters more than you might expect. Start seeds indoors about three weeks before your last expected frost date, per the University of Minnesota Extension, and you’ll have sturdy transplants ready to move out once the soil is workable. Direct sowing outdoors works too — wait until mid-spring to early summer, as the RHS recommends, and sow after the danger of frost has passed.

If you’d rather stagger your harvest, there’s no reason you can’t do both: start a tray indoors for an early head start and direct-sow a second patch outside a few weeks later.

How To Sow Sorrel Seeds: Depth And Spacing

Light is the critical factor. Sorrel seeds need light to germinate, so keep the covering shallow — sow about 1 cm (1/2 in) deep in moist, peat-free compost indoors, or roughly 1/4 in deep when direct sowing. Never bury them deeper than 1/2 in. Cover them lightly, press the soil down gently, and keep it consistently moist but never soggy.

Germination usually takes one to two weeks at about 15°C (59°F), though the University of Minnesota Extension puts the window at one to three weeks across a broader range of 10–24°C. Once seedlings have several true leaves, thin them:

• Bunching greens: thin to about 8 in apart.
• Perennial clumps: thin to 12–18 in apart.

For indoor starts, the RHS recommends moving seedlings with several leaves into individual 7.5 cm (3 in) pots before transplanting. If you buy or grow multiple varieties, a roundup of top sorrel plant seeds can simplify your first order.

Choosing The Right Spot And Avoiding Common Mistakes

Full sun with good drainage is the ideal, per the University of Minnesota Extension. That said, sorrel is a cool-season plant; the RHS notes hot weather can reduce its performance, so if your summers run hot, some afternoon shade is wise. It grows happily in containers, seed trays, or open garden soil, making it a flexible choice for small spaces.

The most common failures are all avoidable:

• Sowing too deep. Seeds need light — keep the covering at or under 1/2 in.
• Overwatering. Moist soil is right; sitting in water rots seeds and seedlings.
• Skipping thinning. Crowded seedlings weaken each other; thin early to the spacing above.
• Transplanting too early. Wait until several true leaves appear and frost risk is done.
• Ignoring heat stress. Hot weather can make leaves bitter and slow growth; shade helps.

One thing sorrel rarely struggles with is pests and disease — it’s a hardy, low-maintenance crop once established.

Harvesting Sorrel

You can start harvesting baby leaves about six to eight weeks after sowing, once plants are a few inches tall. Pick outer leaves as needed, leaving the central rosette to keep producing. Sorrel is a perennial, so established plants return each spring, often for years, and cutting plants back after flowering encourages fresh, tender regrowth.

Leaves are best used fresh, though they also freeze well. The crop’s ability to overwinter and come back stronger is part of why it’s such a practical addition to a home garden.