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. 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. For mass and foundation plantings, allow 8 feet between plants. Make sure the area is protected from cold winds and the hot summer sun for the best results. All summer last year. Endless Summer hydrangea spacing depends on the effect you want. Just … The Original Endless Summer Hydrangea Care. However, morning sunlight and afternoon shade is best in hot climates, as the plant won’t do well in intense, direct sunlight. Hydrangeas love water so keep the soil moist for the first 2 to 3 months after planting and in summer for the first year especially in full sun … In warmer climates, less sun is required. Pruning during the growing season is not recommended, but if desired, prune after the first flush of blooms. Hydrangea paniculata is the best of all hydrangeas able to tolerate the sun. Plant in well-drained, moist soil rich in nutrients. These hydrangeas thrive in full sun to partial shade and make beautiful cut flowers in addition to adding visual interest in the garden. This plant needs five to six hours of sunlight and won’t grow in full shade. Plant 4 feet apart for smaller border plants. 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. The lower threshold of sunlight is 4-6 hours a day. Trim off any winter-damaged or dead stems throughout the year. Weird how differently they behave! Another advantage of this species is that some varieties can tolerate very low temperatures (-35 ° F). Panicle hydrangeas actually need at least five hours of full sun to flower their strongest. Plant Endless Summer hydrangeas in early spring. 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. This is one of the more tolerant hydrangeas, putting up with heat, cold, drought and full sun. I stand corrected about full sun after reading all the new posts. For a full sun hydrangea, plant panicle hydrangea (Hydrangea paniculata). I actually had to put umbrellas over them or they would have become crispy critters. Choose a planting location that receives morning sun and dappled afternoon shade. Still kicking myself that I didn't take a pic of that. Although not required, prune Endless Summer Hydrangeas in early spring. Panicle hydrangea (H. paniculata) – Panicle hydrangea is one of the most sun tolerant hydrangeas. Provide at least six hours of sunlight per day in zones 4-5. I moved 10 ES hydrangeas 10 feet over into noon sun. Panicle hydrangeas can be successfully grown in hardiness zones 3-8. across (12 cm), densely packed with intense rose-pink, violet or blue florets, depending on the soil pH. 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