Lavender 'Phenomenal' Lavender 'Phenomenal' One of the hardiest lavenders! flowers in midsummer, a little later than English types, exceptional winter survival. mound of silver foliage, long spikes of purple-blue flowers. ideal for cutting fresh for bouquets and sachets, and dries well. well-drained soil, 'Phenomenal' is a butterfly-attracting flower Name: Lavandula x intermedia 'Phenomenal' Growing Conditions: Full sun Size: To 32 inches tall and wide Zones: 5-9