'Trehane' Veronica (Veronica prostrata 'Trehane') is noted for its eyecatching, bright yellow-green leaves and lovely blue flower spikes. A perennial, it grows to 6 inches high and spreads to 18 inches wide. It likes full sun and moist soil. The light foliage and striking flowers make it a superb accent plant in the garden or in containers. It's also known as Golden Speedwell.