Genista lydia (south-eastern Europe, western Asia)
Habit: An attractive, prostrate and broad dwarf shrub, 0.3-0.5 m tall, 1 m wide, thorns tipped, arching twigs, conspicuous grey-green; overall domed habit, slow-growing.
Flowers: Yellow butterfly flowers on prickly lateral shoots, May or June, luxurious flowers.
Fruits: Inconspicuous husks.
Leaves: Lanceolate and small, grey.
Roots: Deep, collect nitrogen.
Demands: Only in full sun; tolerates heat and drought, plant in protected areas due to sensitivity to frost, needs wind protection.
Soil: On poor, mineral soil; always well drained and not too moist; slightly acidic to slightly alkaline.
Hardiness: Zone 7a