The Mountain Hydrangea 'Wilson 7820' is a lacecap cultivar of Hydrangea serrata with a collector's number name. It produces flat flower heads with a ring of blue sterile florets surrounding a center of tiny fertile flowers. The plant has a compact habit and is cold-hardy, typical of the species. It is a choice selection for enthusiasts of species hydrangeas.


| Family: | Hydrangeaceae (hy-drain-jee-AY-see-ee) |
| Genus: | Hydrangea (hy-DRAIN-juh) |
| Species: | serrata (sair-AY-tuh) |
| Cultivar: | Wilson 7820 |
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Mountain Hydrangea 'Blue Deckle': Serrated Leaves and Delicate Blue Lacecaps
Mountain Hydrangea 'Golden Sunlight': Variegated Foliage and Delicate Lacecaps
Mountain Hydrangea 'Yae no Amache': Japanese Double Lacecap with Layered Beauty
Hydrangea 'Chishima': Compact Serrata from the Kuril Islands
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