Kamakura may be the first place that comes to mind for hydrangeas in Kanagawa, but the prefecture hides a world of unique varieties found nowhere else. From seaside blooms to mountain clusters and rice-paddy backdrops, here are three original hydrangea cultivars you can only encounter in Kanagawa.

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Hakkei Blue — Yokohama Hakkeijima Sea Paradise

Named through a public contest to celebrate Hakkeijima Sea Paradise's 20th anniversary in 2013, Hakkei Blue is a lacecap hydrangea distinguished by pale blue petals and double-flowering form. Find it in the park's Blue Paradise zone and Hakkei Blue Garden. During the rainy season, the island hosts one of the prefecture's largest hydrangea festivals, with roughly 20,000 plants in full bloom.

Shione — Kannonzaki Park, Yokosuka

Shione is the signature hydrangea of Kanagawa Prefectural Kannonzaki Park in Yokosuka, where the park acquired both the original stock and naming rights. Its defining feature is a remarkable colour shift — blooms open pure white and gradually transition through blue to purple tones as they mature. Look for them around the Park Centre and the Flower Plaza.

Kaisei Blue — Kaisei Town

Nestled in western Kanagawa, Kaisei Town adopted the hydrangea as its official flower in 1977 and has been cultivating them along paddy fields and farm roads since 1983, planting roughly 5,000 bushes. Today the sight of verdant rice fields framed by hydrangeas is the town's signature early-summer landscape. Kaisei Blue was created to commemorate the 30th Kaisei Hydrangea Festival — bred from the 'Ohayo' lacecap variety with a pale blue-purple lacecap parent. The blooms open in soft blue and deepen to a rich, intense indigo over time. The festival takes place in early June each year.

When to See Hydrangeas in Kanagawa

Peak viewing typically runs from early June through early July. Coastal areas — Yokohama, Kamakura, and the Miura Peninsula — colour up first, hitting their stride in the first half of June. Cooler inland spots around Hakone, Tanzawa, and the western Ashigara region tend to peak from late June into mid-July.

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