Foliage: The leaves are large, deeply lobed, and resemble oak leaves. They are dark green in summer, turning rich shades of red, purple, and bronze in the fall.

Flowers: Produces large, upright, conical flower clusters that start white and gradually turn pinkish as they age. The blooms appear from late spring to early summer and can persist into fall, providing long-lasting beauty in the garden.

Light Requirements: Prefers partial shade to full sun. For optimal growth and flowering, plant "Harmony" in a location that receives morning sun and afternoon shade, particularly in warmer climates. While it can tolerate full sun, especially in cooler regions, too much direct sunlight in hot areas can cause leaf scorch and reduce flower production.

Soil Requirements: Thrives in well-draining, fertile soil. "Harmony" prefers rich, loamy soil with a slightly acidic to neutral pH (5.5-6.5). It can adapt to various soil types, including sandy and clay soils, provided they drain well. Incorporating organic matter such as compost or leaf mold into the soil will help retain moisture and improve fertility, which is essential for the plant's health.

Watering: Requires regular watering, especially during dry periods. Keep the soil consistently moist, but avoid waterlogging, as "Harmony" is relatively drought-tolerant once established but performs best with consistent moisture. Mulching around the base of the plant helps retain soil moisture and regulate temperature, which is especially beneficial during hot, dry spells.

Temperature and Humidity: Hardy in USDA zones 5-9. "Harmony" is well-suited to temperate climates and can tolerate cold winters, going dormant and regrowing in the spring. It prefers moderate to high humidity levels but can adapt to various conditions. Protect the plant from harsh winds and extreme frost to ensure it remains healthy throughout the growing season.

Fertilization: Apply a balanced, slow-release fertilizer in early spring to support healthy growth and abundant flowering. A second application in mid-summer can help sustain the plant during the peak blooming period. Use a fertilizer specifically designed for hydrangeas or a balanced formula with equal parts nitrogen, phosphorus, and potassium. Avoid over-fertilization, as it can lead to excessive foliage growth at the expense of blooms.

Pruning: Prune lightly in late winter or early spring before new growth begins. Since "Harmony" blooms on old wood, avoid heavy pruning, which could reduce the number of flowers for the following season. Remove dead or weak stems and shape the plant as needed. If the plant becomes too large, prune after flowering to control its size without sacrificing the next year's blooms.

Pests and Problems: Generally pest-resistant, but may occasionally be affected by aphids, spider mites, or leaf spot. Ensure good air circulation around the plant to prevent fungal diseases. If pests or diseases are detected, treat with insecticidal soap or neem oil. Regular inspection and good garden hygiene can help maintain plant health.