Temperature: Hardiness Zones 5-10 (8 if your located in high hot & humid area)
Watering: If Lavenders could talk they would shout, "don't over water!" Excessive watering promotes disease and Lavenders are very susceptible to root rot from moist soil. When you do water, make sure to water the soil and not the plant, adequately and not excessively.
Soil:Well draining soil is the key to a happy Lavender, to help prevent root rot from moist soil.
Comments: Good circulation is vital as lavenders cannot tolerate damp and humid conditions. They need a lot of room to grow and they need a lot of air moving around them to avoid excess moisture which will lead to rot.
'Grosso' Lavender is hardier than other Lavender varieties, and is best appreciated for its sturdy growth habit and ease of drying and preserving. This aromatic herb works well as a fragrant hedge or an accent when planted with Bergamot, Feverfew or Joe Pye Weed. One of the tallest Lavender varieties, 'Grosso' is also deer and rabbit resistant, grows easily in sandy or salty conditions and is very self sufficient. Because its blooming flower stalks are more round than other varieties, 'Grosso' is commonly called "Fat Spike".
Like other Lavenders, 'Grosso' is known as a stress reliever and is added to many shampoos, lotions and Aromatherapy spa products for its soothing effect. Producing huge, profuse blooms, this is commercially preferred over other strains because of its tolerance to cold. Because this is a hybrid, 'Grosso' is sterile and will not produce seed. The best way to propagate is from stem cuttings once the plant is established.