Only the flowers of bigleaf (Hydrangea macrophylla), also known as mopheads and lacecaps, can change color. Other types such as oakleaf hydrangeas or hydrangea… See more

Look for hydrangeas that are bred to be blue such as 'Nikko Blue', Endless Summer The Original, 'Blue Danube', 'Penny Mac', 'Blauer Prinz', or Endless Summer Twist-n-Shout. The … See more

For true blue flowers, the hydrangeas need to be grown in acidic soil (pH 5.5 and lower). For pink flowers, the plants need neutral to alkaline soils (pH 6.5 and higher). For purple … See more

Soil pH needs to be regulated to produce consistently blue blooms. Work pH soil additives into the top layer of the soil around the root zone to help keep the flowers the … See more