One of the most reliable shrubs for hot and dry sites, Genista hispanica (Spanish Broom) is a spiny, gorse-like deciduous shrub with abundant clusters of bright yellow, pea-like flowers in late spring and early summer. They are born atop spiny green stems clad with small and dark green prickly leaves.
From early spring to late summer (you can do it until early autumn if your area does not cause frost or is late) with organic fertilizers such as guano (available here) once a month.fertilizers so that the substrate does not lose its ability to filter water.