Garden Plant Guide: Hydrangea Shrubs Lee's Product Team, October 14, 2024October 14, 2024 Everything You Need to Know About Hydrangea Shrubs for Your Landscaping Hydrangeas are popular flowering shrubs known for their large, colorful blooms and their ability to thrive in a variety of garden settings. These shrubs are versatile and can be used as focal points, border plants, or in mixed garden beds. Whether you’re a seasoned gardener or just starting out, understanding the key characteristics of hydrangeas can help you choose the right variety and care for them properly. Here’s a breakdown of important attributes to consider for hydrangeas. AttributeDescription for Hydrangea ShrubsSizeRanges from 3 to 10 feet in height and width depending on the variety.Insects & PestsProne to pests like aphids and spider mites, but generally manageable with care.Bloom TimeBlooms from late spring to early fall, with colors that may change based on soil pH.MaintenanceLow-maintenance; benefits from deadheading and proper pruning based on variety.Root GrowthShallow root system; consistent watering and mulching help keep roots healthy.SeasonalityDeciduous, offering seasonal interest with summer blooms and bare winter branches.Watering NeedsRequires regular watering to maintain moist soil, especially during dry periods.Sunlight RequirementsPrefers partial shade but can tolerate full sun in cooler climates.Soil CompatibilityThrives in rich, well-drained soil; bloom color changes based on pH levels.Growth RateModerate to fast growth rate with adequate water and sunlight.Hardiness ZoneBest grown in USDA Hardiness Zones 3–9, depending on the variety.Color & AestheticsShowy flower clusters in white, pink, blue, and purple; adds bold color to gardens.Wildlife AttractionAttracts pollinators like bees and butterflies.Allergy ConcernsLow allergen production, suitable for allergy-sensitive areas.Edibility/ToxicityToxic if ingested by pets or humans.Wind ToleranceSensitive to strong winds; best planted in sheltered areas.Invasive PotentialNon-invasive, easy to control in gardens.Mulching NeedsBenefits from mulching to retain soil moisture and regulate temperature.LifespanLong-lived perennial with potential to thrive for many years.FertilizationAnnual fertilization with balanced, slow-release fertilizer is recommended.Companion PlantingPairs well with shade-loving plants like hostas and ferns. See also Guide to Edible Northwest Plants for Your Front and Backyard Garden Plant Guide