History
Dark Green Italian Flat Leaf Basil is a time-honored heirloom variety rooted in the culinary traditions of the Mediterranean — a bold, large-leafed basil prized by Italian cooks for generations for its rich fragrance, vigorous growth, and exceptional flavor. Unlike the smaller-leafed Genovese types, this flat leaf variety produces broad, dark green leaves with an intense sweet-spicy aroma and a slightly more robust flavor profile that holds up beautifully in cooked sauces, fresh salads, and herb oils. Passed down through generations of kitchen gardeners, this open-pollinated, non-GMO heirloom is a workhorse of the herb garden — productive, fragrant, and deeply satisfying to grow.
Plant Profile
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Days to Maturity: 60–75 days from transplant to first harvest
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Plant Size: Upright, bushy plants 18–30 inches tall and 12–18 inches wide
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Leaves: Large, broad, flat dark green leaves averaging 2–4 inches
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Plant Type: Open-pollinated, non-GMO heirloom warm-season annual
Flavor Profile
Dark Green Italian Flat Leaf Basil delivers a rich, sweet, slightly peppery flavor with classic clove-like undertones and a bold, lingering fragrance. The large leaves are highly aromatic — brush against them in the garden and the scent fills the air. Fresh leaves are ideal for pesto, caprese, and pasta; the robust flavor also holds up well when briefly cooked into sauces and soups in a way that more delicate basils cannot.
Growth Type & Harvest Yields
This is a fast-growing, high-yielding annual that rewards regular harvesting with continuous new growth all season long. Plants develop an upright, bushy habit and produce large leaves in abundance. The more you harvest, the more it grows — pinch stems just above a leaf node and the plant branches out, doubling its productivity. A planting of 4–6 plants will keep a household in fresh basil from early summer through first frost.
Disease Resistance
- Good overall garden vigor when grown in warm, sunny conditions with proper airflow
- Proper spacing reduces risk of powdery mildew and leaf spot in humid conditions
- Water at soil level — wet foliage invites fungal issues
- Tip: Grow in raised beds or containers with excellent drainage for best results
Growing Tips & Planting Dimensions
- Spacing: 10–12 inches between plants; 18–24 inches between rows
- Sow depth: 1/4 inch — cover lightly with fine seed-starting mix
- Germination: 7–14 days at soil temps of 65–70°F
- Full sun — at least 6–8 hours of direct sunlight daily
- Prefers rich, well-drained soil; keep evenly moist but never waterlogged
- Start indoors 4–6 weeks before last frost; transplant after nights stay consistently above 50°F
- Pinch growing tips regularly to encourage bushy, productive plants
- Remove flower buds to maintain leaf production and peak flavor
🌱 Good Things Come in Small Packages
Dark Green Italian Flat Leaf Basil seeds are small — but don't let their size fool you. These little seeds carry everything needed to grow into vigorous, fragrant plants. They just ask for a little extra care at germination. Follow these steps and you'll be well on your way.
How to Germinate Successfully:
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Start with the right foundation. Use a fine seed-starting mix — not garden soil or coarse potting mix. Sift it if needed. Small seeds need a smooth, even surface to make good contact and germinate reliably.
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Cover lightly — just barely. Press seeds onto the moist surface and cover with no more than 1/8 inch of finely sifted mix. These seeds don't need light to germinate but they don't want to be buried either.
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Mist, don't drench. Use a spray bottle to keep the surface evenly moist. Watering from above can wash small seeds away before they ever get started.
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Warmth is your friend. These seeds germinate best at 65–70°F — basically normal room temperature. A heat mat can help if your space runs cool.
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Trap the humidity. Cover your tray with a humidity dome or a loose piece of plastic wrap. This keeps moisture and warmth stable while you wait.
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Give them time. Keep conditions consistent, resist the urge to overwater, and trust the process — they will sprout.
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Thin with scissors, not fingers. Once seedlings appear, snip extras at the soil line rather than pulling. These roots are close together and pulling one can disturb its neighbors.
When to Plant
Start seeds indoors 4–6 weeks before your last frost date. Transplant outdoors after frost danger has passed and soil temperatures are consistently above 60°F. Find your frost dates and hardiness zone at the USDA Plant Hardiness Zone Map.
Companion Plants & Mutual Benefits
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Tomatoes — the classic pairing; basil may improve tomato flavor and attracts pollinators to the garden
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Peppers — similar heat-loving growing conditions make them ideal companions
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Marigolds — attract beneficial insects and brighten the herb garden
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Lettuce — basil provides light shade during the hottest part of summer
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Oregano & Parsley — productive herb garden companions with shared care needs
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Cucumbers — basil aroma may help attract pollinators for improved yields
How to Enjoy
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Fresh Pesto: The large leaves make exceptional pesto — bold flavor, easy to process, minimal waste
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Caprese Salad: Layer with fresh mozzarella, ripe tomatoes, and a drizzle of good olive oil
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Pasta Sauces: Tear leaves into finished sauces for a fresh herbal finish
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Pizza: Add fresh leaves after baking for classic Italian flavor
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Herb Butter & Infused Oil: Blend with butter or steep in olive oil for a richly flavored finishing condiment
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Drying & Freezing: Dry or freeze leaves for year-round use in cooked dishes
Why Gardeners Love Dark Green Italian Flat Leaf Basil
- Large, bold leaves — more surface area means more flavor per leaf and easier processing
- Rich heirloom fragrance and flavor that fills the garden and the kitchen
- Highly productive — continuous harvests all season with regular pruning
- Versatile in the kitchen — fresh, cooked, dried, or frozen
- Open-pollinated and non-GMO — save your own seeds year after year
- Beautiful addition to raised beds, containers, and kitchen gardens
Harvest Tips
- Begin harvesting when plants reach 6–8 inches tall — snip stems just above a leaf node
- Harvest in the morning after dew has dried for the strongest fragrance and flavor
- Never remove more than one-third of the plant at a time for continued production
- Pinch flower buds as they appear to redirect energy into leaf production
- For drying, harvest just before flowering — flavor is most concentrated at this stage
- Store dried basil in an airtight container away from light and heat for up to 1 year
Order Today
Add Dark Green Italian Flat Leaf Basil Seeds to your herb garden and grow the bold, large-leafed heirloom basil that belongs in every Italian kitchen garden. Choose your pack size and begin to grow.
