Phlomis russeliana - Jerusalem Sage seeds

Phlomis russeliana, commonly known as Jerusalem Sage or Russel's Phlomis, is a perennial ground cover plant of interest for its robustness and unusual appearance. This Mediterranean plant bears attractive green foliage and upright stems with whorls of pale yellow flowers. It adapts well in borders, rock gardens, or as a mass planting, where it is valued for its drought resistance and low maintenance requirements.

Belonging to the Lamiaceae family, Phlomis russeliana is native to Mediterranean regions, particularly Syria and Turkey. In its natural habitat, it is mainly found in dry and sunny areas, often on rocky or poor soils. This bushy, perennial plant can reach up to 1 metre in height and spread about 60 to 80 cm wide. Its growth is moderate but regular, allowing it to gradually form large structured masses. The greyish-green, woolly foliage persists in winter in mild regions. It remains attractive even outside the flowering period. The stiff, erect floral stems bear whorls of light yellow helmet-shaped flowers, appearing from June to August. These flowers, arranged in tiers along the stems, contrast pleasantly with the foliage. They attract numerous pollinators. The fruits of Phlomis russeliana are dry capsules, called achenes, which develop at the base of faded flowers. Ovoid and small (3 to 4 mm), these brown achenes contain a single seed. They often persist on the plant in autumn. The plant may sometimes self-seed in the garden without becoming invasive.

Phlomis russeliana is also notable for its cold resistance (down to -15°C) and its drought tolerance once well-established. It is an ideal plant for dry climates or gardens. This Jerusalem Sage fits well in perennial borders, dry or Mediterranean gardens, and even as an edging plant along pathways. Its vertical structure and spike-like yellow flowers create dynamic scenes. It pairs particularly well with other sun-loving, drought-tolerant perennials such as Lavenders, Catmints, Euphorbia characias ssp. wulfenii (Spurge), and Achillea millefolium 'Terracotta' (Terracotta Yarrow). Phlomis russeliana is also highly effective for stabilising slopes or embankments. It can be used en masse to create a meadow effect or in combination with dry soil grasses for a natural, flowing effect.