Lavandula pedunculata — Butterfly Lavender — is a Mediterranean lavender native to Spain, Portugal, Morocco, and western Turkey, closely related to and often confused with French Lavender (Lavandula stoechas). It is distinguished by long, wiry flower stalks that lift the dense flower head well above the gray-green foliage, topped with prominent purple bracts that flutter like butterfly wings — the feature both common names refer to.
It shares French Lavender's need for sharp drainage and full sun, and dislikes wet or heavy soil, especially in winter. In frost-free zones it can self-seed readily around bare soil or gravel mulch, so deadhead spent stalks before seed sets if you want to keep it in check. Prune after the main flush to keep growth compact, but never cut back into old bare wood, which does not regenerate. The essential oil is high in camphor rather than the linalool that makes English Lavender prized for perfumery, so it has traditionally been used more for cleaning products and topical antimicrobial remedies than fragrance.
Growing lavender? Read the Lavender Growing Guide — which species suits your zone, drainage, pruning, and harvesting for drying, timed to your frost dates.Lavender Shab Disease
Shoots wilt and die back individually while the rest of the plant looks healthy. Small dark fungal bodies may appear on infected stems, and dieback spreads over the season.
Prune out and destroy affected stems well below the wilted section, cleaning tools between cuts. Remove severely infected plants. Improve air circulation, avoid overhead watering, and plant in well-draining soil to limit spread.
Phytophthora Root Rot
Wilting despite moist soil, yellowing leaves, stunted growth, and dark, decayed roots and crown tissue. Vines may collapse during hot weather.
Plant in well-draining soil and avoid waterlogging. Remove and destroy affected vines. Improve drainage with raised beds or amended soil and avoid overwatering.
Botrytis (grey mould)
Grey fuzzy mould on petals and stems, worst in cool wet conditions.
Remove affected parts immediately. Improve air circulation. Avoid overhead watering. Apply copper fungicide if severe.