Lavandula x intermedia 'Grosso'
Lavandula x intermedia 'Grosso' (Purple Lavandin) - This plant grows as a mound to about 2 feet tall by 3 feet wide with fragrant narrow leaves. Sweet smelling, dark purple flowers bloom in summer. Appreciates an open sunny location where it can grow well in poor alkaline soil. It is drought tolerant and needs only to be irrigated occasionally to infrequently once established – over watered plants are floppy and weaker. Dislikes overly wet conditions. It is cold hardy to below 15 degrees F and can be long lived if pruned hard after flowering in late summer – cut back deep into the leafy stems above the hard wood but do not prune in late fall or winter. Some recommend replacing plants every 5 years or so. Lavenders are attractive to bees and butterflies but not particularly to browsing animals – deer tend to leave alone but rabbits sometimes nibble. This lavender variety is the most commonly used to extract lavender oil.