Pressed Blue Hydrangeas – The secret to capturing these lovely shades of watercolor-like blues and greens is letting the flowers begin to age before you pick them for pressing. When the petals are streaked with many shades of blue and green, and have a papery feel, they are ready to press. Blossoms of hydrangea pressed too soon will quickly brown. I don’t use microwave heat to press hydrangeas, pressing between the pages of older books works best. These beautiful hydrangeas are a little preview of Spring in the midst of Winter.