Grosso Lavender: Growing the Classic Lavandin for Bundles & Oil
Grosso lavender is the dependable workhorse of many harvest fields. It makes a broad silver-green mound, sends up long fragrant stems and produces the kind of purple sweep that convinces visitors the farmer planned everything—including the clouds.
Botanically, Grosso is Lavandula x intermedia 'Grosso,' a lavandin hybrid. Missouri Botanical Garden describes a mounded, shrubby plant roughly two to three feet tall with very fragrant summer flowers. Give it similar width and enough room to harvest without crawling through the row like a botanically themed commando.
Why growers choose Grosso
Grosso is widely valued for:
- Long, sturdy stems for fresh and dried bundles.
- A strong, recognizable lavender fragrance.
- Higher oil potential than many compact English lavenders.
- A large, uniform landscape habit.
- A later bloom window that can extend harvest after English lavender.
- Excellent pollinator activity when part of the crop remains in flower.
Lavandin oil generally carries more camphor than Lavandula angustifolia oil. That profile is useful for fragrance, soap, home products and many distillation programs, but it is not always the preferred flavor for food. Choose the cultivar by product goal.
Can Grosso grow in the Great Lakes?
Yes, in a suitable cultivar zone and especially in a dry winter site. Grosso is often listed for Zones 5 or 6 through 8 or 9, depending on the source and production system. Use the Great Lakes USDA Zone Finder and confirm the active product record.
Cold is not the only risk. Grosso's broad mound can trap moisture when planted tightly, and winter saturation can damage roots and crowns. Select an open, sunny site away from runoff and low ground.
Michigan State University Extension recommends sandy loam, good drainage and a pH around 6.5 to 8 for Michigan lavender. Test the soil before liming. If the profile remains wet after rain or thaw, use engineered raised rows, correct drainage or another site.
Plan spacing for a large lavandin
Plan individual plants at about their expected mature width, often 30 to 36 inches or more. A tighter hedge may close faster but can reduce airflow and access. In humid climates, extra room is inexpensive disease management.
For field rows, add the plant radius on both sides to the path required by your mower, cart, irrigation maintenance and harvest crew. Five- to six-foot row centers are common starting points, but equipment and cultivar vigor decide the final number. Test the layout in Field Planner and the Lavender Farm Simulator before planting.
Choose plugs, pots or bare root
Great Lakes Lavender Farm may offer Grosso in several formats:
- 72-cell trays for economical commercial volume.
- Deep 20-cell trays for greater root volume and easier field handling.
- 3-inch and 4-inch plants for garden and small-row installation.
- 1-gallon plants for demonstration beds and immediate landscape presence.
- Two-plus-year bare-root plants for eligible spring bulk planting.
Wholesale minimums currently begin at two 72-cell trays, three 20-cell trays or 75 bare-root plants per variety in multiples of 25. Use the Wholesale Hub for current crop, lead time, pricing and destination eligibility.
Plant Grosso correctly
Set the crown at grade. A container plant should sit at the same depth it grew in the pot; a bare-root crown should be even with finished soil while the roots extend downward. Backfill with the prepared soil, firm gently and water thoroughly.
Avoid rich compost pockets and heavy organic mulch against the woody crown. Mineral mulch can fit a dry landscape design, but it cannot fix a saturated subsoil.
Spring is the safest establishment season in marginal cold zones. Great Lakes ships eligible live plants March 1 through May 31 and October 1 through November 30, and bare root March 1 through May 31. Summer live-plant shipping is paused, while scheduled local pickup may be available when stock and checkout allow.
Irrigation and fertility
Water new Grosso deeply, then allow the root zone to approach dry. Monitor small plugs and windy plantings more closely. Once established, Grosso is drought tolerant, though a production field may need supplemental water during extended dry periods.
Use drip irrigation to limit canopy wetting. Inspect emitters and the wetting pattern; a line can look busy while a root zone remains dry three inches away.
Lavender is a light feeder. Test soil or production media. Too much nitrogen produces soft growth, fewer flowers and a mound more interested in sprawling than working.
Prune for a dense productive mound
Lightly shape young plants to encourage branching. After harvest, trim remaining flower stems and leafy growth into a rounded form while leaving green foliage on every cut. Avoid hard pruning into old, bare wood.
In cold regions, complete major shaping early enough for regrowth to harden. Wait for visible spring growth before removing winter-damaged tips. Annual light pruning is more successful than allowing years of woody growth and then attempting botanical renovation television.
Harvest Grosso by product
Dried bundles
Cut when spikes are colored and the first florets begin to open. This stage usually holds color and buds well. Cut stems consistently, retain leafy growth on the plant and dry small bundles in shade with strong airflow.
Fresh bundles
Allow additional flowers to open for visual fullness, then handle gently and keep stems cool.
Essential oil and hydrosol
Harvest stage affects oil quantity and aroma. Establish a consistent stage, distill labeled test batches and record crop moisture, flower development, charge weight, time and yield. "About purple enough" is not a repeatable distillation protocol.
Pollinators
Leave a portion blooming if pollinator support is part of the plan. Grosso's abundant flowers are attractive to bees and other beneficial insects.
Grosso versus Phenomenal
Both are vigorous lavandins with purple flowers and strong landscape value.
| Compare | Grosso | Phenomenal |
|---|---|---|
| Classic role | Long-stem bundles and high-yield fragrance crop | Broad landscape performance and vigorous rounded habit |
| Plant shape | Large mounded shrub | Compact-to-broad rounded mound depending on climate |
| Fragrance | Strong, classic lavandin profile | Strong lavandin fragrance |
| Decision factor | Proven harvest role and long stems | Site performance, architecture and cultivar preference |
Use Compare Cultivars for the current catalog data and trial both when commercial acreage is planned. The better plant is the one that survives your winter, fits your product and can be harvested by your crew.
Frequently asked questions
Is Grosso lavender edible?
Lavandin has a stronger camphor profile than English lavender and is usually not the first culinary choice. Use only a food-intended lavender product identified for culinary use.
How big does Grosso get?
Missouri Botanical Garden describes it at roughly two to three feet tall, and it can spread similarly. Leave enough room for airflow and harvest.
Is Grosso good for essential oil?
Yes. It is widely used for productive distillation and a strong lavandin fragrance. Record harvest stage and process for consistent results.
Can I grow Grosso in Zone 5?
Some listings include Zone 5, but site and winter drainage matter greatly. Confirm the active product record and use a protected, fast-draining microclimate.
Keep exploring
- Grosso Lavender Plants and Plugs
- Compare Cultivars
- Phenomenal Lavender Guide
- Wholesale Hub
- 72-Cell and 20-Cell Plug Trays
- Bare Root Lavender
- Field Planner
- Lavender Farm Simulator
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