One
of the most popular blue hydrangeas is the Nikko Blue hydrangea.
The Nikko Blue hydrangea has blooms that begin as cream colored
with blue margins, and then turn a solid blue as the plant
matures. The Nikko Blue hydrangea prefers full shade to partial
sun, and is widely adaptable to a range of soils. Hardy in
zones five through nine, the Nikko Blue hydrangea prefers
soil that is slightly acidic.
Another
of the blue flowering hydrangeas is the Blue Billow. This
blue hydrangea is one of the earliest blooming lacecap hydrangeas.
They grow to four feet high and six feet wide, and have many
dark iridescent blue flowers. The plants prefer part shade,
and bloom early in the growing season. These blue hydrangeas
are pretty cold hardy, and grow best in zones five through
nine.
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| Another
way to get blue hydrangeas is to custom tint the blooms personally.
Affecting the acidity level of the soil will do this. Hydrangea
microphylla will bloom either blue or pink, depending on the
soil. In more acidic soil, the blooms will be blue, and pink
in alkaline soil. If blooms are pink and a blue would be preferred,
simply add some aluminum sulfate to the soil mixture, and
the following year blooms will be blue.
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