Italian Large Leaf basil is a useful choice when you want broad green leaves for pesto, sandwiches and fresh sauces. It performs best as a regularly harvested plant in warm weather. Give each seedling space to branch and plan your harvest around the plant's recovery, rather than taking every large leaf at once.
Planting at a glance
- Crop
- Italian Large Leaf basil
- Life cycle
- Frost-tender annual in most U.S. gardens
- Sowing depth
- ¼ inch
- Germination
- 5–10 days in favorable conditions
- Spacing
- 12–18 inches
- Harvest estimate
- 60–75 days listed from transplant
Use local frost dates and growing conditions to adjust planting and harvest timing.
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Italian Large Leaf Basil Seeds
Know your Italian Large Leaf basil
Italian Large Leaf belongs to the familiar sweet basil group. Its broad green foliage is the feature you are growing for. It is not the same packet as Genovese, and the name does not guarantee a particular leaf size under every condition. Light, moisture, spacing and harvest all influence the finished plant.
If you grow several sweet basil varieties, label each row and compare the actual flavor and growth. A broad leaf is convenient for kitchen use, but a crowded seedling pot will not become a productive planting without thinning and room for roots.
Plan the planting around your harvest
For pesto, several spaced plants are more useful than one heavily stripped specimen. Rotate your cuttings among them and let each recover. For occasional garnish, a single well-grown patio plant may be enough. Match the planting to the amount you realistically use.
The product describes maturity from transplant, so remember that indoor seedling time comes before that estimate. You can take small early cuttings once the plant is well established. A second summer sowing can provide young replacement plants if the first crop becomes woody or disease affects the bed.
Our basil harvesting guide shows how to choose the next cut while leaving room for regrowth.
Sow in warmth and provide early light
Start seeds indoors about four to six weeks before the date you expect to plant outside. In a short season, an earlier protected start can help, but avoid raising large root-bound plants long before warm weather arrives. Direct sowing is also possible after frost danger has passed and soil has warmed.
Sow about a quarter inch deep in clean seed-starting mix, keep evenly moist and provide warmth around 70–75°F. Once seedlings appear, remove any cover and give bright light. Thin extras so each young plant has room. Cold, wet mix is a poor substitute for a warm seed-starting position.
Transplant and keep roots growing steadily
Harden indoor seedlings gradually for about a week, then plant at their original depth in well-drained soil. Wait for reliably warm conditions, not just a date on the calendar. Basil is sensitive to cold even without a hard freeze. Choose a position with roughly six to eight hours of sun and room for air movement.
Check below the soil surface before watering. Keep the root zone evenly moist but not waterlogged, and aim water at the soil. Use a soil test to guide bed amendments. Containers may need modest feeding according to their mix and fertilizer labels, but extra fertilizer cannot compensate for weak light or damaged roots.
Harvest for the next flush of leaves
Harvest by cutting a shoot above a healthy leaf pair, leaving plenty of foliage below. New side shoots can then develop into the next harvest. Picking every large lower leaf while leaving a bare, flowering stem is a less useful pattern for continued kitchen production.
Take healthy leaves for fresh use and rinse them before preparation. For surplus pesto or chopped basil, freezing is a practical option. Do not store homemade fresh herb-and-oil mixtures at room temperature. Small frozen portions make it easier to use a large harvest without repeatedly thawing the whole batch.
Read the leaves and stems
Sweet basil can develop downy mildew. Watch for yellowing with gray-purple growth beneath leaves rather than assuming every pale plant needs feed. Remove confirmed affected plants, improve airflow and avoid splashing foliage. This packet is not represented as a disease-resistant cultivar.
If the leaves remain small, examine the growing conditions before blaming the variety: a restricted root ball, a shaded patio or repeated heavy cutting can all limit growth. Change one clear problem at a time and watch the new leaves, which provide a better measure than old damaged foliage.
Grow a useful container plant
For a patio plant, choose a pot with drainage holes and enough volume to avoid constant drying. A container about twelve inches across is a useful starting point for one regularly harvested plant, with a larger pot for a bigger specimen. Use potting mix and allow runoff to drain freely.
Indoors, supply strong light rather than relying on a dim windowsill. Start new plants when older ones become woody or decline. Before autumn cold arrives, take the useful harvest and decide whether a new indoor sowing under lights fits your space. A warm room alone will not keep an annual basil productive forever.
Our guide to growing herbs indoors with lights explains how to plan an indoor growing space.
Growing questions
Is Italian Large Leaf the same as Genovese?
Both are sweet basil types, but they are separately named seed selections. Use the label to keep them distinct.
How do I get more leaves for pesto?
Grow several plants with adequate spacing and harvest stem tips above leaf pairs, allowing time for regrowth.
Should I remove every flower?
For leaf production, pinch developing flower tips. You can leave selected plants to flower if you want ornamental or insect value.
Ready for another planting? See Italian Large Leaf Basil Seeds for the current packet options.
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
- Penn State: Basil.
- University of Minnesota: Growing Basil.
- University of Minnesota: Basil downy mildew.
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: BasilikumGenovesergroßblättriger.jpg, Goldlocki. CC BY-SA 3.0. Resized for display. The Pinterest graphic crops the cover photograph; its photo retains the stated license.
- Article photo 1: Basilico Genovese di Prà-2.jpg, . CC BY-SA 2.5. Resized for display. The Pinterest graphic crops the cover photograph; its photo retains the stated license.
