I actually had to put umbrellas over them or they would have become crispy critters. The lower threshold of sunlight is 4-6 hours a day. You gotta love a showy, flowering beauty that’s hardy to zone 3 (unlike its mophead, blue-flowered cousin H. macrophylla), looks its best in autumn when the rest of the garden starts to burn up, works in schemes from cottage to formal, adapts to full sun or part shade, some can be trained into a small tree or left as a big, blowsy shrub, is a romantic cut flower, and attracts butterflies. A recent addition to the Endless Summer series, Hydrangea macrophylla Endless Summer® BloomStruck® is another exceptional mophead cultivar with medium-sized, rounded flower heads, up to 5 in. Panicle hydrangeas can be successfully grown in hardiness zones 3-8. Here is a list of cold hardy Hydrangea varieties that will grow in USDA Planting Zone 6, where winter temperatures go down to as low as 10 below 0 F. These floriferous shrubs are used extensively in landscape design as colorful accents or specimens, natural hedges and buffers, or in groupings in landscape borders and home foundation plantings. across (12 cm), densely packed with intense rose-pink, violet or blue florets, depending on the soil pH. Endless Summer hydrangea spacing depends on the effect you want. Plant 4 feet apart for smaller border plants. Make sure the area is protected from cold winds and the hot summer sun for the best results. Plant in well-drained, moist soil rich in nutrients. I stand corrected about full sun after reading all the new posts. The original Endless Summer Hydrangea prefers partial shade, but the sunlight conditions vary with some in this series performing better in full sun than others. Panicle hydrangea (H. paniculata) – Panicle hydrangea is one of the most sun tolerant hydrangeas. Although not required, prune Endless Summer Hydrangeas in early spring. All summer last year. For a full sun hydrangea, plant panicle hydrangea (Hydrangea paniculata). Choose a planting location that receives morning sun and dappled afternoon shade. You can find Endless Summer Twist-n-Shout® Bigleaf Hydrangea online here.They also go by the name Hydrangea macrophylla ‘PIIHM-I’ PP20, 176. Weird how differently they behave! Plant Endless Summer hydrangeas in early spring. These hydrangeas thrive in full sun to partial shade and make beautiful cut flowers in addition to adding visual interest in the garden. Trim off any winter-damaged or dead stems throughout the year. Provide at least six hours of sunlight per day in zones 4-5. The Original Endless Summer Hydrangea Care. In warmer climates, less sun is required. I moved 10 ES hydrangeas 10 feet over into noon sun. Just … However, morning sunlight and afternoon shade is best in hot climates, as the plant won’t do well in intense, direct sunlight. This plant needs five to six hours of sunlight and won’t grow in full shade. 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