Italian flat leaf parsley gives a kitchen garden a steady supply of broad green leaves when you allow time for germination and protect the plant's center at harvest. Start it in a clearly labeled tray or row, keep the roots evenly moist, and take whole outer stems as the plant becomes established.
Planting at a glance
- Crop
- Italian flat leaf parsley, Petroselinum crispum
- Life cycle
- Biennial, usually grown for first-year leaves
- Sowing depth
- ¼ inch
- Germination
- Often 14–30 days
- Spacing
- About 10–12 inches for full plants
- Light
- Full sun to partial shade
Use local frost dates and growing conditions to adjust planting and harvest timing.
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Italian Flat Leaf Parsley Seeds
Know the flat leaf type
Italian flat leaf parsley has broad, divided leaves rather than tightly curled foliage. It is a culinary parsley, distinct from cilantro even though both are leafy herbs in the carrot family. Keep seedling labels in place until the leaves become easy to recognize.
Italian flat leaf parsley develops a broad rosette that needs more room than its tiny seedlings suggest. Mature size varies with the selection and growing conditions. Plan enough space for the actual plant rather than crowding it based on its small seedling size.
Give the seed enough time
Start indoors about six to eight weeks before your intended outdoor planting, or direct sow in a prepared spring seedbed. Sow around a quarter inch deep and keep the mix damp. An optional overnight soak before sowing can hydrate the seed, but it does not remove the need for patient, consistent care.
Germination commonly takes two to four weeks and can take longer in cool conditions. Write the date on the label and avoid digging through the tray repeatedly. A fine spray or gentle bottom watering maintains moisture without burying seed. After emergence, provide bright light and remove any humidity cover.
Transplant carefully around the taproot
Individual cells or small pots make it easier to move seedlings without tearing their roots. Thin extras with scissors and avoid letting the root system become a dense tangle. Grow seedlings on until you can lift a coherent root ball.
Harden plants gradually before transplanting. Choose well-drained soil that holds moisture, with sun for much of the day; afternoon shade can be useful in very hot climates. Plant at the existing depth, allow around ten to twelve inches for mature plants and water thoroughly. Newly set plants need their original root balls checked during the first weeks.
Keep growth steady through the season
Water the root zone as it begins to dry, rather than waiting for repeated wilt. Mulch between established plants to reduce weeds and splashing, keeping the crown clear. A soil test is the best basis for bed fertilizer. Container plants may need modest feeding as nutrients wash out, following the fertilizer label.
If foliage pales, check moisture, drainage, light and roots as well as nutrition. Repeated feeding cannot repair a saturated pot. Remove badly damaged leaves and inspect the remaining plant. A small problem is easier to identify when weeds and debris are not hiding the base.
Cut outer stems and protect the center
Wait until the plant has enough foliage to spare, then choose a mature outer stem. Cut it near the base with clean scissors, leaving the young central leaves intact. Move around the plant as you harvest. Taking only the leafy tip from every stem leaves an untidy plant and is less useful than removing selected whole stems.
Start with small amounts from a young plant and allow regrowth between larger cuttings. For kitchen use, rinse leaves before preparation. Refrigerate fresh harvests appropriately or freeze chopped portions. A well-established plant can support repeated harvest, but constant stripping weakens it.
See our parsley regrowth guide for more detail on harvesting without damaging the center.
Grow parsley in a deep pot
Choose a container about ten to twelve inches deep or more, with drainage holes and potting mix. One or a few sensibly spaced plants are easier to keep productive than many seedlings squeezed together. Check moisture often on a sunny patio, especially in wind.
For indoor growing, provide strong light and enough root room. A plant can remain alive in a kitchen window without producing enough leaves for frequent cutting. If new growth becomes long and weak, improve the light and reduce harvest pressure while it recovers.
Plan for the second year and visiting caterpillars
Parsley is biennial. Plants that survive winter commonly flower in the following season, and removing the flower stalk does not restore a young first-year plant indefinitely. Sow replacements annually if leaves are the priority. Keep a flowering plant only if you want flowers, insects or a seed-saving project.
Black swallowtail caterpillars may use parsley as a host. Identify them before treating, and consider setting aside an extra plant if you want to support them. For saved parsley seed, consider nearby flowering parsley varieties because cross-pollination can change the next generation.
Our guide to growing herbs indoors with lights explains how to plan an indoor growing space.
Growing questions
Does flat leaf parsley grow back after harvest?
A healthy plant can regrow when you remove selected outer stems and leave the center and adequate foliage.
Can flat leaf and curly parsley grow together?
Yes, for leaf harvest, provided each has enough room. If saving seed, consider cross-pollination between flowering plants.
Why is my parsley flowering?
Parsley commonly flowers after its first growing season and winter exposure. Start replacement plants for a fresh leaf crop.
Ready for another planting? See Italian Flat Leaf Parsley Seeds for the current packet options.
For a different cool-season kitchen herb, our guide to growing chervil from seed explains surface sowing, container care and keeping a supply of tender leaves.
Sources and photo credits
Prepared with AI assistance using Gardeners Basics product information and horticultural references. This guide does not describe a Gardeners Basics growing trial. Research and license links open in a new tab.
Growing references
Photo credits
Photographs illustrate the crop or growing stage. They are not photographs of a Gardeners Basics growing trial; a specific cultivar is identified only where the source documents it.
- Cover: Petroselinum crispum 003.JPG, H. Zell. CC BY-SA 3.0. Resized for display. The Pinterest graphic crops the cover photograph; its photo retains the stated license.
- Article photo 1: Petroselinum crispum 001.JPG, H. Zell. CC BY-SA 3.0. Resized for display. The Pinterest graphic crops the cover photograph; its photo retains the stated license.
