While Lavender is usually regarded as a summer-blooming flower, some Lavender plants are early bloomers with their magnificent blooms appearing early in spring. Others are late bloomers with blooms opening up in midsummer and lasting until late summer. Planting one of each in your garden will reward you with heavenly fragrance and attractive flower spikes from spring until late summer. Alternatively, you can simply choose a variety of Lavender which blooms almost continuously from spring to summer's end.
Fitting this description are Lavandula stoechas cultivars (Spanish Lavender), which produce several full flushes of flowers during the growing season, provided their flowers are cut after each flush.
Lavandula stoechas, also called Spanish Lavender or Butterfly Lavender is recognizable by the conspicuous sterile bracts resembling extravagant ears, on top of the short dense inﬂorescence. Grown for its silvery aromatic leaves, its very distinctive flowers, however, steal the show with their "ears" sprouting from each flower head. This Lavender loves hot weather, but is more tender (Hardiness 8-9) than other Lavenders. Flowering typically occurs as early as May (in areas with mild summers and winters) with another flush of blooms in June followed by another flush of color in late summer or fall.
Note: Bloom times highly depend on weather conditions. Spring may arrive sooner or later in your area than in California or New England. But the bloom sequence of Lavenders remains unchanged. Early blooming Lavenders will always be the first ones to show off in the garden, whether this is in May or June in your area.