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Hydrangea paniculata 'HYLV17522' REDLIGHT® panicle hydrangea
Symbivit Tric (arbuscular)
Symbivit (arbuscular)Hydrangea
The panicle hydrangea (Hydrangea paniculata) is a deciduous shrub or small tree native to East Asia, naturally occurring in the mountain forests and valleys of China, Korea, Japan, and Russia’s Sakhalin Island. It is distinguished by its strikingly conical panicles composed of small fertile and showy sterile florets, which shift in color over the season from white through pink to wine-red, and by its high tolerance for full sun. The species was botanically described in 1829 by the German physician and botanist Philipp Franz von Siebold (1796–1866), who encountered it during his work in Japan. It reached Europe through botanical collections and expeditions of the 19th century, with the first cultivars such as ‘Grandiflora’ and ‘Floribunda’ spreading in gardens only toward the end of that century.
A milestone in the breeding of Hydrangea paniculata came with the expedition of American dendrologist Charles Sprague Sargent to Japan in 1892. He brought back seeds from which, in the following years, the cultivar ‘Praecox’ was raised—the first documented variety with early flowering. Its beauty was already praised in 1897 in the journal Garden and Forest, and when the plant became established in cultivation, Sargent himself called it in 1922 one of the most beautiful shrubs in the Arnold Arboretum. The original specimen still grows there today as a living botanical monument more than a century old.
REDLIGHT® is a compact panicle hydrangea that, from early July, produces abundant flower clusters about 12–14 cm tall and wide. At the beginning of flowering, the blooms are white to softly lime‑green, gradually deepening over the summer into vivid, even strikingly pink shades that make them impossible to overlook in September, bringing vibrancy and freshness among fading perennials. The leaves are rich green, deciduous, and the sturdy, upright branches hold the inflorescences without the need for staking. A mature plant reaches about one meter in height, making it ideal even for smaller gardens or containers.
This cultivar is part of the Gardenlights® series, which is introduced and marketed through Nick van Rosmalen’s company BREEDIT, supporting breeders with licensing and distribution. The actual breeder of is Dutch nurseryman Lendert de Vos of Kwekerij Lendert de Vos in Reeuwijk. The variety is protected by these patents: PP35447 (USA – 2023) and 66445 (EU – 2024).
REDLIGHT® can make a charming little shrub in a small garden, working beautifully as a modest specimen with ever‑changing colour that you will love summer through autumn. Or – if your garden is a bit larger – take a bolder approach and turn it into a low hedge, a border divider that will look stunning when paired with the right companions. In summer it pairs gracefully with pastel‑toned shrubs such as deciduous ceanothus or dwarf butterfly bushes. For a brighter spark, both large‑ and small‑flowered hypericum will do the trick, while dark‑leaved perennials like actaea, ligularia, or lobelia bring a touch of drama. And of course, it also looks excellent among evergreen shrubs – either as a foreground planting if they are taller, or intermingled with dwarf forms. To soften the effect, weave in a few smaller grasses such as pennisetum, molinia, Calamagrostis or deschampsia.
Last update 17-10-2025
Panicle hydrangeas thrive best in full sun but cope well with light partial shade provided they have sufficient moisture. Soil type is not critical, yet in fertile, deeper and well‑drained ground they produce the largest flower heads and the strongest framework. After planting they need regular watering, as their shallow root system dries out quickly during the first two years; once established they tolerate short summer droughts, although they remain healthier and less prone to wilting in evenly moist soil. They respond very well to feeding, but fertilisers with a lower nitrogen content are preferable to encourage flowering rather than overly lush growth that weakens the stems. They tolerate any aspect and a wide pH range. Each spring before budbreak they require a hard prune, leaving roughly 10 to 20 cm of the previous year’s wood, as they flower exclusively on new shoots. They grow well in containers but need more frequent watering and a sheltered position away from strong winds, which can snap young stems carrying heavy flower heads. Standard forms require a firm staking system, which must be renewed after four to five years to support the increasing weight of the crown. Their cold tolerance reaches approximately –34 °C (USDA zone 4).
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