How to Grow Flat-Leaf Parsley
Petroselinum crispum var. neapolitanum
Flat-leaf parsley offers a distinct, clean flavor essential for many culinary dishes. Gardeners prize this herb for its long growing season and ability to thrive in cool weather conditions.
Starting Flat-Leaf Parsley: indoors or direct sow?
🏠 Start indoors 4 weeks before your last spring frost, then move the seedlings outside.
If starting indoors, move seedlings outdoors after all danger of frost has passed, hardening them off gradually for a week before planting.
Soil, care & harvest
Prepare rich, well-drained soil with a pH between 6.0 and 7.0. Sow seeds indoors or directly outdoors 2-6 weeks before your last spring frost date. Press seeds gently into the soil surface without covering them deeply, as they require light for germination. Expect sprouts to appear within 14 to 28 days.
Space plants 6 to 8 inches apart to ensure healthy growth. While parsley does not need support or trellising, keep the soil consistently moist with about an inch of water weekly. Apply a light mulch around the base to retain moisture and suppress weeds, but avoid piling it against the stems.
Watch for aphids, carrot fly, armyworms, and swallowtail caterpillars; encourage beneficial insects or hand-pick pests to prevent damage. Diseases like powdery mildew appear in humidity, so ensure good air circulation. Harvest leaves once the plant is established, typically 70-90 days after sowing, by snipping outer stems as needed.
When to Plant Flat-Leaf Parsley
Planting windows vary by USDA hardiness zone. Look up yours by ZIP code.
| Zone | Start Indoors | Direct Sow | Harvest |
|---|---|---|---|
| Zone 3 | April – May | — | July – October |
| Zone 4 | March – April | — | July – October |
| Zone 5 | March – April | — | June – October |
| Zone 6 | March – April | — | June – November |
| Zone 7 | February – March | — | June – November |
| Zone 8 | February – March | — | May – December |
| Zone 9 | January – February | — | April – December |
Companion Plants for Flat-Leaf Parsley
✓ Good companions
Parsley attracts beneficial insects that protect asparagus from asparagus beetles
Parsley attracts beneficial insects that prey on cabbage worms and other brassica pests
Parsley improves carrot flavor and growth, while carrots help loosen soil for parsley roots
Both herbs repel similar pests and enhance each other's growth without competition
Parsley attracts parasitic wasps that control corn borers and other corn pests
Parsley provides ground cover and attracts beneficial insects that control pepper pests
Parsley repels rose beetles and aphids while attracting beneficial predatory insects
Parsley repels tomato hornworms and aphids while tomatoes provide light shade
✗ Keep away from
Inhibits parsley seed germination and can stunt established parsley growth
Parsley's strong root system can compete for nutrients and stunt lettuce growth
Both are aggressive spreaders that compete for space and nutrients
Nutrition Facts
Per 100g serving (USDA FoodData Central)
