💜 Grosso Lavender

What it looks like

Why this variety

Grosso is the lavender you have seen in photographs of endless purple rows: a lavandin — a hybrid of English lavender and spike lavender — bred for the perfume industry, with long, fat spikes of violet-blue flowers on stems up to 3 feet tall. It produces more oil per plant than any English lavender, which is why it is the most widely grown lavender on earth, and in a home garden it means armloads of bundles from a single shrub.

Grosso’s vigor is the lavandin advantage made visible: hybrid vigor gives it bigger plants, longer stems, and more flowers than either parent, and its open, upright habit moves air through the plant — a real asset in humid gardens where still, damp air kills lavenders. Its scent is stronger and more camphorous than English lavender’s, which makes it superb for sachets, bouquets, and oil, and less ideal for delicate baking.

Florida translation, honestly: Grosso is tougher than English lavender in heat, but it is still a Mediterranean plant that demands drainage above all. In North Florida, a raised bed with gritty mix and gravel mulch gives it a real shot at perennial life; farther south, grow it in a large pot you can shelter from the wettest weeks, and enjoy the biggest lavender harvest of any type you can grow here.

How to grow

Buy plants — lavandin hybrids are sterile and do not come true from seed. Plant in spring in full sun and sharply drained soil, spacing 30–36 inches apart; Grosso is a big plant and crowding it defeats the airflow that keeps it healthy. Water in well, mulch with gravel, and cut flower spikes as they open. After bloom, shape lightly into green growth; never cut into bare old wood.

Water & feeding

Water deeply but rarely once established, only when the top few inches are dry. Grosso is drought-tolerant and dislikes wet feet far more than dry spells; in Florida’s rainy season, a raised bed is the difference between a perennial and a puddle casualty. Feed lightly in spring — a little castings or balanced feed — and skip heavy nitrogen, which grows floppy stems that need staking.

Common problems

• Root and crown rot in wet soil — drainage is the whole game.
• Floppy stems if overfed or shaded — full sun and lean soil keep stems upright; stake only if a storm flattens a loaded plant.
• Woody centers with age — annual shaping into green growth, and replacement after 5–7 years if the center goes bare.
• Camphor-forward scent — wonderful for sachets and oil, stronger than English lavender for baking; use a lighter hand in the kitchen.

Harvest

Cut long spikes just as buds open, in the morning after dew dries — Grosso’s stems are the longest of any common lavender, so bundles are generous and drying is easy. Hang upside down in a warm, airy spot out of direct sun, strip buds once crisp, and expect a second, smaller flush after a light summer cut. One mature plant can fill a season of sachets.

Saving seeds

Grosso is a lavandin — a hybrid of English lavender and spike lavender — and it is sterile, so it does not come true from seed; buy plants and propagate by cuttings. The Saving seeds section of the Lavender guide covers seed for the species generally.