Lavandula intermedia Grosso
Grosso French Hybrid Lavender
Lavandula 'Grosso' is a classic French hybrid Lavender grown for its fragrant dark blue flower spikes and vigorous growth habit. With nice wide gray-green foliage, 'Grosso' is a large grower and blooms heavily providing an ample harvest of flowers for lavender wands, sachets, and culinary use. This is an outstanding honeybee plant providing mid-summer flowers after the English lavender finishes flowering in early summer. 'Grosso' has good cold hardiness for a French hybrid and thrives in zone 6 winters in well-drained soils.
Lavandula 'Grosso' is hardy to zone 10 only in dry, arid climates such as the West. This is not recommended for planting in a wet, humid environment such as the Gulf Coast, Southern TX or Florida.
HBL4O31 (Plant - 3.5" deep pot) - Out of stock.
HBL4O51 (Plant - 5" deep pot) - Out of stock.
|Common Name||Grosso French Hybrid Lavender|
|Botanical Name||Lavandula intermedia Grosso|
|Zones||6, 7, 8, 9, 10|
|Light Requirements||Full Sun|
|Mature Height||30-32" tall|
|Mature Spread||36-48" wide|
|Ships As||Potted Plant|
|Planting Time||Spring / Summer, Fall|
|Soil Type||Sandy Soil, Average Soil, Low Fertility Soil, Well-Drained Soil|
|Soil Moisture||Drought Resistant / Waterwise|
|Amount of Rain||10 to 20", 20 to 30", 30 to 40" (with care)|
|Advantages||Deer Resistant, Attract Butterflies, Bee Friendly, Rabbit Resistant, Fragrant Flower / Foliage, Extended Bloom Time (more than 4 weeks)|
|Additional Information||3.5" Pot size grown by our friends at Perennial Favorites in Layton, UT|
|Ideal Region||Coastal California, Southwest, West, Pacific Northwest|
|Neonicotinoid-Free||Yes - Learn More|
|Ships to Hawaii, Alaska & Canada||No|
Tips for Growing Lavender
Lavender are sun-loving plants that thrive in hot weather and grow best in arid climates. Lavender plants will be taller and wider in mild winter, hot summer climates. The same varieties when grown in cold (zone 5-6) winter climates tend to be more compact. Lavender plants require two-to-three growing seasons to reach mature size.
These perennials are a superb choice for the drought-resistant garden, doing best in the drier parts of the US like the Great Plains, Intermountain West and West Coast (which has a true Mediterranean climate (wet winters and dry summers). In the Mid-West and Eastern US, sandy soils are a must, and planting on a slope or in a raised bed provides optimum drainage. For the southern US with hot, humid heat, Spanish Lavender (Lavandula stoechas) is the best choice. For large growing Lavender, we recommend French Lavender or hybrid Lavender (Lavandula intermedia) varieties. The key is to make sure you choose a variety with sufficient winter cold hardiness for your region. (‘Vera’ and ‘Pastor’s Pride’ are among the most cold hardy.) Yet with proper soil preparation, and planting site selection, Lavender can also thrive in moister, more humid climates like the Mid-West, East Coast and Mid-Atlantic states. Lavender Phenomenal does particularly well in areas with more moisture and humidity.
- Plant in full sun with good air circulation.
- Plant into well drained soil. Compost-enriched garden loam is alright in drier climates, sandy or gravel soil is best in moister climates. Heavy, poorly-drained clay soils will be fatal.
- Select a raised or sloped bed, or a planting site against a hot wall or along a cement/asphalt walk or driveway where the reflected heat keeps growing conditions hotter and drier.
- New transplants need regular watering. Don't let the plants get too dry. Supplemental watering can be greatly reduced the second growing season as the plants become established.
- When using drip irrigation, place the emitter off to the side of the plant, not right on the root ball to avoid overwatering of mature plants.
- Fertilize once annually in the fall with a top dressing of Yum Yum Mix.
- Mulch with gravel or pine needles in arid climates. In moister climates mulching with gravel will protect the crown from excessive moisture and soil splashed onto the foliage.
More in-depth guidance for growing and maintaining Lavender plants: Growing Lavender, Lavender Bliss, A History of Lavender, The Bold and the Beautiful: New and Recent Lavender Introductions and Lavender: An Old World Herb That Has It All.
View more Planting Guides, or download our complete Planting Guide for tips on caring for your plants when you receive your order, as well as planting instructions for Perennials, Spring-Planted Bulbs, Fall-Planted Bulbs, Cacti & Succulents, Xeric Plants and more.
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Q & A
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USDA Hardiness Planting Zones
To determine if a plant is sufficiently cold hardy, the USDA created numbered zones indicating winter low temperatures; the lower the zone number the colder the winter.
- If the coldest winter temperature expected in your area is -15°F (zone 5) then any plants rated zones 3-5 will survive the winter temperatures in your area.
- If you live in very warm winter areas (zones 9-11) plants with zones 3-4 ratings are not recommended. The lack of freezing winter temperatures do not provide a time for winter dormancy (rest).
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