Grosso
365d to harvest
Breathe in the unmistakable, cool-sweet perfume of Grosso Lavender—an aromatic standout with long, richly colored flower spikes that hold their fragrance as they dry. Expect a dense, upright habit with silvery foliage that feels softly velvety to the eye, and blossoms that deliver a concentrated, floral-lavender character. Grow Grosso for its showy, long-lasting blooms in the garden and for fragrant potpourri and sachets, or to scent your favorite homemade aromatic blends.
Crop Dates
Growing note: In frost-free Zone 10b, grow this cool-season crop during the cooler dry season (October–February).
| Milestone | Date |
|---|---|
| Start Indoors | — |
| Climate | Frost-Free Climate |
| Transplant / Sow Outdoors | Oct 1st |
| Harvest Begins | Feb 28th |
| Harvest Ends | Feb 28th |
Crop Details
| Trait | Value |
|---|---|
| Days to Maturity | 365 |
| Sun Requirements | Full Sun |
| Growth Habit | Shrub |
| Support Needed | None |
| Planting Depth | Normal |
| Germination Temp (°F) | 70 |
| Min Soil Temp (°F) | 60 |
| Min Night Temp (°F) | 45 |
| Harden Off (days) | Not Required |
Recommended Companions
Frequently Asked Questions
What pest or disease most commonly affects Lavandula × intermedia (Grosso), and how do I manage it?
The most common problem is root rot from poorly drained soil, which shows up as sudden wilting, yellowing, and blackened roots. Water only when the top 1–2 inches of soil are dry, plant in fast-draining ground or raised beds, and avoid wet foliage. If plants decline despite good drainage, remove the affected stems/plant and replant in fresh, well-drained soil to prevent spreading.
How can I tell when Grosso lavender is ready to harvest?
Harvest when most flower spikes are in color but the lower florets haven’t opened fully—about when the buds on the spike start to swell and the first flowers begin to show. Use a gentle touch: the spikes should feel firm, not papery or dried out. For best fragrance, cut on a dry morning and harvest before full bloom for the most consistent oil-quality.