Hydrangeas. Pruning: Prune lightly after the vine is done flowering to control its height and width. They fill gardens with their green, leafy foliage and incredible blooms during the warm months. The two kinds of hydrangeas … The mophead hydrangea (Hydrangea macrophylla) is also known as the bigleaf, garden or lacecap hydrangea. Gardeners in zone 10 can try hydrangeas in containers. Hydrangea anomala ssp. And know your growing zone! This is the hydrangea where you can shift the color of blooms from blue to pink depending on soil pH. This variety thrives in Zone 8. petiolaris. It is commonly sold in florist’s shops and given as a gift in a 1-gallon pot. This is a list of heat tolerant Hydrangea varieties that will grow in USDA Planting Zone 9, where low winter temperatures can go down to 20 degrees F winter. They have large, coarse-textured leaves and grow 2- to 6-feet tall and wide, depending on the variety. Acid soil produces blue flowers, while alkaline soil produces pink flowers. Classic mophead or French hydrangea (Hydrangea macrophylla; top) opens softball size flowers that transition through a range of colors as they age. Its flowers range from white to pink to lavender to blue. Bigleaf or French hydrangea (Hydrangea macrophylla, USDA zones 5 through 9), feature the classic mophead or lacecap flower clusters and are either deep blue in acidic soil or pink in alkaline soil. These floriferous beauties 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. Hydrangea macropylla—also known as French, Japanese or Snowball hydrangea--is the most successful hydrangea for cultivation in Zone 10. Bigleaf hydrangeas (Hydrangea macrophylla) are also known as French hydrangeas or garden hydrangeas. Bloom time: May to July. 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. Southern gardeners can grow the old-fashioned mopheads, H. macrophylla, also called the bigleaf, French, garden or florist’s hydrangea. 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. Grow them in the shade or in cool sunrooms. Mopheads are rated to USDA cold hardiness zone 6. Hydrangeas are deciduous in Zone 8 and, in the southern parts of this zone, should be planted in dappled or partial shade and watered frequently during the height of the summer. Hydrangea (Hydrangea macrophylla), sometimes called French hydrangea, is a large shrub with beautiful masses of color. Zones: 4-8 (doesn't thrive in zone 7) Height/Spread: 30-40 feet/5-6 feet (grown upright) Exposure: Part to full shade. While some hydrangeas are extremely cold hardy and thrive in the harsh winter conditions up to zone 4, other hydrangeas are only cold hardy to growing zone 6. Varieties of smooth hydrangea (Hydrangea arborescens, USDA zones 3 through 9), also called wild hydrangea, only reach 3 to 5 feet tall and wide. Color: White. www.gardenality.com/Plants/793/Shrubs/French-Hydrangea.html The pH of the soil affects the color of the blooms. Here is a list of cold hardy Hydrangea varieties that will grow in USDA Planting Zone 4, where temperatures drop to as low as 30 below 0 F in winter. Mophead Hydrangea. Hydrangea trees make a bold statement as accent pieces in the garden and in containers framing entryways. 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