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Lavender Grosso
Lavandula intermedia Grosso
Lavender Grosso is renowned for its highly fragrant, oversized dark blue flower spikes and blooms profusely providing an ample harvest of flowers.
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Lavender Grosso Plants for Sale Online
Lavender 'Grosso' (Lavandula x intermedia 'Grosso') is one of the most fragrant and robust lavender varieties, prized for its long, deep purple flower spikes and high oil content. Blooming from mid to late summer, 'Grosso' produces masses of vibrant, aromatic flowers on tall, slender stems that are perfect for cutting, drying, or using in sachets, wreaths, and essential oils. Its silver-gray foliage adds year-round texture and contrast to garden beds, borders, and containers, making it a must-have for anyone seeking both beauty and functionality in the landscape.
This vigorous lavender cultivar thrives in full sun and well-drained, sandy or rocky soil, and it performs exceptionally well in hot, dry conditions. Lavender 'Grosso' is drought-tolerant once established, making it ideal for xeriscaping, Mediterranean-style gardens, and low-maintenance perennial borders. It's also highly deer- and rabbit-resistant and attracts a wide range of pollinators, including bees, butterflies, and hummingbirds. With a mature height of 24 to 36 inches and a tidy, mounding habit, 'Grosso' lavender adds fragrance, movement, and a burst of rich color to any sunny outdoor space.
Perfect for USDA Zones 5–9, Lavender 'Grosso' is easy to grow and maintain with light pruning and minimal fertilization. It pairs beautifully with other sun-loving, drought-tolerant plants like yarrow, salvia, and ornamental grasses. Whether you’re designing a water-wise garden, a fragrant herb bed, or simply adding elegance to your patio pots, 'Grosso' lavender offers long-lasting blooms, aromatic foliage, and exceptional garden performance year after year.
| Hardiness Zone: | 5-9 |
|---|---|
| Mature Height: | 2.5 to 3 Feet |
| Mature Width: | 3 to 3.5 Feet |
| Sunlight: | Full Sun |
| Water Requirements: | Water well until established |
| Selling Points: | Fragrant foliage, long bloom period |
How to Care for Lavender Grosso
Be sure to read our planting instructions to ensure a healthy and happy Lavender Grosso plant for years to come!
How do I Plant Lavender Grosso Plants?
To plant Lavender 'Grosso' (Lavandula x intermedia 'Grosso'), start by selecting a location that receives full sun—at least 6 to 8 hours of direct sunlight each day. This highly fragrant, cold-hardy lavender variety thrives in well-drained, slightly alkaline soil and does best in sandy or gravelly conditions. Avoid heavy clay soils that retain moisture, as excess water can cause root rot. When planting, dig a hole twice as wide and just as deep as the root ball, and gently loosen the roots before placing the plant. Position the crown of the lavender slightly above soil level, backfill with soil, and water thoroughly to help settle the roots. To ensure healthy growth, space Lavender 'Grosso' plants about 24 to 36 inches apart to allow for proper air circulation—essential for preventing fungal diseases in humid climates. After planting, apply a 1- to 2-inch layer of gravel mulch to improve drainage and reflect heat, mimicking the plant’s native Mediterranean environment. Water sparingly after establishment, and avoid fertilizing too heavily, as 'Grosso' lavender prefers lean soils. With the right planting technique and growing conditions, this vigorous cultivar will reward you with long stems of silvery foliage and deep purple blooms perfect for drying, cutting gardens, and pollinator-friendly landscapes.
How should I fertilize my Lavender Grosso Plants?
Fertilizing Lavender 'Grosso' (Lavandula x intermedia 'Grosso') should be done sparingly, as this drought-tolerant, Mediterranean herb thrives in lean, well-drained soil. In early spring, apply a light dose of a low-nitrogen, slow-release fertilizer—such as a 5-10-10 or 7-9-5 formula—to support healthy root development and strong flower production without encouraging excessive leafy growth. Spread the fertilizer evenly around the base of the plant, keeping it a few inches away from the crown to prevent rot, and water lightly afterward to help nutrients absorb into the soil. For gardeners seeking an organic approach, amending the soil with a small amount of compost, bone meal, or well-aged manure in the spring can provide adequate nutrition without overfeeding. Over-fertilizing Lavender 'Grosso' can lead to leggy stems and reduced bloom quality, so it’s best to feed only once a year or when signs of nutrient deficiency—such as pale leaves or weak flowering—are evident. With the proper balance of light feeding and minimal care, 'Grosso' lavender will thrive and produce long stems of fragrant, deep purple blooms perfect for drying, crafting, and attracting pollinators all summer long.
How should I Water my Lavender Grosso Plants?
Watering Lavender 'Grosso' (Lavandula x intermedia 'Grosso') properly is essential to maintaining its health and fragrance-rich blooms. During the first growing season, water deeply once or twice a week to help establish a strong root system. Be sure to allow the soil to dry out completely between waterings, as lavender dislikes consistently moist conditions. Overwatering can lead to root rot, especially in poorly drained soils, so it's best to water at the base of the plant to keep foliage dry and reduce the risk of fungal diseases. Once established, Lavender 'Grosso' becomes extremely drought-tolerant and requires minimal supplemental watering. In most climates, watering every 10 to 14 days during dry periods is sufficient. Always check the soil moisture by inserting your finger 1–2 inches below the surface—if it feels dry, it's time to water. Avoid overhead watering to preserve the silvery foliage and keep the blooms healthy and intact. With proper watering techniques, Lavender 'Grosso' will reward you with long-lasting, fragrant flower spikes that are ideal for cutting, drying, and attracting pollinators to your garden.
How and when should I prune Lavender Grosso Plants?
Pruning Lavender 'Grosso' (Lavandula x intermedia 'Grosso') is essential for maintaining its compact shape, encouraging bushy growth, and maximizing bloom production year after year. The best time to perform a major pruning is in late summer to early fall, just after the flowering period has ended. Use clean, sharp shears to trim back about one-third of the plant’s height, focusing on cutting into the soft, green growth—never into the woody stems, as lavender does not reliably regrow from old wood. This post-bloom pruning helps the plant conserve energy, prevent legginess, and encourages dense new growth the following spring. A lighter spring trim can also be done in early to mid-spring to remove any winter-damaged tips and fine-tune the shape. Deadheading spent blooms throughout the season will encourage additional flowering and keep the plant tidy. Proper annual pruning not only extends the life of your Lavender 'Grosso' plant but also improves air circulation, reducing the risk of mildew and other diseases. With regular care and timely pruning, 'Grosso' lavender will continue to produce long, fragrant flower spikes perfect for cutting gardens, dried arrangements, and pollinator-friendly landscapes.
