How to Grow Mediterranean Lavender Grosso

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Mediterranean Lavender Grosso

Lavandula x intermedia 'Grosso'

shrub

Grosso is a hybrid lavender cultivar prized for its large, fragrant flower spikes and robust growth habit. It combines the hardiness of English lavender with the vigor of Portuguese lavender, making it an excellent choice for Mediterranean-style gardens. This variety produces abundant purple flowers and is commonly used for culinary, ornamental, and commercial essential oil production.

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Example Mediterranean Lavender Grosso timeline · Pittsburgh, PA (Zone 6b)

Plant Mediterranean Lavender Grosso
Around Apr 17

Near Pittsburgh's average last spring frost.
Tend & protect
Late spring–summer

Watering, feeding, and pest-watch reminders.
Harvest Mediterranean Lavender Grosso
Late summer into fall

Before the first fall frost (≈ Nov 8)

Sample dates for Pittsburgh, PA. Sign up to get exact Mediterranean Lavender Grosso dates for your own zip code.

Growing Conditions

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Sun: Full sun, 6-8 hours daily minimum (8+ hours preferred)

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Water: Drought-tolerant once established. Water deeply but infrequently during growing season. Reduce watering significantly in winter. Overwatering is the primary cause of failure—allow soil to dry between waterings.

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Spacing: 24 inches

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Days to maturity: 120-150 days (first flowers); full mature size in 2-3 years

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Planting depth: Plant transplants at same depth as nursery container; sow seeds 0.1 inches deep (press into soil, barely cover)

Soil

Type: Well-draining sandy or gravelly loam

pH: 6.0-8.0

Amendments:

Perlite or pumice for drainage Coarse sand Avoid heavy compost or peat moss

Growing Zones

Find your zone →

Thrives in zones 6-9, with winter protection possible in zone 5b

5b 6a 6b 7a 7b 8a 8b 9a 9b

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Growth Stages

Seedling

3-4 weeks

Tiny cotyledons emerge within 14-21 days; very delicate with needle-like leaves.

Keep soil barely moist, not wet. Provide bright light. Ensure excellent drainage to prevent damping-off. Germination is slow and irregular.

Vegetative

2-3 months

Compact bushy growth with narrow, silvery-green, aromatic foliage. Plant develops a woody base.

Pinch back growing tips when 4-6 inches tall to encourage bushiness. Reduce watering as plant matures. Begin light shaping. No fertilizer needed.

Budding

2-3 weeks

Elongated flower spikes develop at stem terminals; buds appear tightly packed along stems.

Continue reducing water. Do not fertilize (nitrogen promotes foliage at expense of flowers). Ensure full sun exposure for best bloom color.

Flowering

6-10 weeks (June-August in most climates)

Abundant purple-violet flower spikes emerge in profusion. Grosso produces notably larger and more numerous flowers than many lavender varieties.

Harvest flowers as they open for culinary/craft use or to prolong blooming. Deadhead spent flowers to encourage repeat blooms. Minimal water and no fertilizer.

Hardening/Dormancy

2-3 months

Growth slows, foliage deepens in color. Plant prepares for winter dormancy or dry season.

Reduce water to minimal levels. Do not prune in fall (wait until spring after frost danger passes). Mulch lightly in colder zones if winters are harsh.

Companion Planting

Plan your garden →

Plant with:

Rosemary Thyme Catmint Santolina Oregano Salvia Echinops (Globe Thistle) Salvias Artemisia Curry Plant

Avoid planting near:

Hydrangeas Hostas Ferns Moisture-loving perennials Dense shade-loving plants Nutrient-hungry vegetables

Common Pests

Hand-pick beetles early morning; use neem oil spray if severe; encourage beneficial insects. Mostly cosmetic damage.
Increase air circulation; spray leaves with water to raise humidity; use insecticidal soap; avoid excessive nitrogen fertilizer.
Spray with strong water stream; use insecticidal soap or neem oil; attract beneficials like ladybugs and lacewings.
Prevent with excellent drainage and minimal watering. Remove infected portions. Ensure good air circulation. No fungicide reliably effective; prevention is critical.

Uses

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Floral Flavoring & Herbal Tea

Culinary

Grosso lavender flowers are edible and used to flavor desserts, honey, salt, and herbal infusions. The large, abundant blooms make it ideal for culinary production. The flavor is floral, slightly sweet, and aromatic. [source]

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Relaxation & Sleep Support

Medicinal

Lavender essential oil and dried flowers are widely used in aromatherapy and herbal medicine for their calming properties. Linalool and linalyl acetate are the primary bioactive compounds responsible for relaxation benefits. [source]

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Essential Oil & Perfumery

Craft

Grosso is commercially cultivated worldwide for essential oil production. The variety yields 1-2% essential oil by weight with high linalool and linalyl acetate content, making it valuable for perfumes, cosmetics, and aromatherapy products. [source]

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Dried Flower Arrangements & Sachets

Household

The large, long-stemmed flower spikes are ideal for dried flower arrangements, wreaths, and home fragrance sachets. Dried flowers retain fragrance for months to years. [source]

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Pollinator Support

Wildlife

Grosso lavender is an excellent nectar and pollen source for honey bees, bumble bees, butterflies, and other pollinators throughout its long flowering season. It is valued in organic and sustainable gardens for supporting beneficial insect populations. [source]

This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.

Harvest Tips

Harvest flower spikes in early morning after dew dries, just as flowers begin to open for maximum fragrance and color. Cut stems 2-3 inches from woody base to encourage new growth. Dry flowers by hanging bundles upside-down in a warm, airy, dark location for 2-3 weeks. Grosso produces abundant flowers suitable for large-scale harvesting. Best harvested in peak bloom (typically July-August in temperate climates).

Fun Facts

🌱 Grosso is one of the most commercially important lavender cultivars worldwide, accounting for significant global essential oil production. Its name means 'big' or 'large' in Italian/Spanish, referring to its notably larger flower spikes compared to English lavender.
🌱 Mediterranean lavenders can live 15-20+ years or longer if grown in ideal conditions with proper drainage and minimal water. Some wild populations in the Mediterranean are believed to be hundreds of years old.
🌱 Lavender's fragrance comes from volatile essential oils stored in specialized glandular hairs on the flowers and leaves. These oils are most concentrated in early morning hours and peak during peak bloom, which is why harvest timing significantly affects oil yield and quality.

Gardening Terms

New to gardening? Learn about terms used in this guide:

Cultivar Deadhead Full Sun Germination Hybrid Mulch Pinch Back

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