We have grown Aloysia virgata since 2001 and it has become one of our favorite summer flowering plants. In our climate, tree verbena dies to the ground in winter and behaves as an 8' tall perennial, whereas in more southerly climates it makes a large open shrub to 15'. The upright woody stems of Aloysia virgata are clothed with dark green sandpapery leaves. Starting in July and continuing until a hard frost, the branches end in terminal spikes of extremely fragrant white flowers that attract butterflies, other cool insects, and even garden visitors. The intoxicating fragrance of vanilla almond is strongest in late afternoon and evening.