Plant Decadence® Periwinkle Popcicle False Indigo in full sun for best flowering. Space plants 3-4 feet apart. Use well-drained soil, preferably sandy or loamy. Water regularly during the first growing season to establish a deep, extensive root system. Once established, it is drought-tolerant. Fertilize in early spring with a balanced, slow-release fertilizer. Prune back in late winter or early spring to encourage new growth. Divide clumps every 3-4 years to maintain vigor.