Plant Invincibelle® Ruby Smooth hydrangea in well-drained soil with full sun to partial shade. Space plants 3-4 feet apart. Water regularly, especially during dry spells, to keep the soil consistently moist. Fertilize in early spring with a balanced, slow-release fertilizer. Prune in late winter or early spring, cutting back stems to about 12 inches to encourage new growth and blooms. Protect from harsh winds and extreme temperatures.