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The root system of potted hydrangeas is not protected from winter cold the same way plants are when in the ground. As such, the winter hardiness zones are not accurate for potted plants.
Only some types of big leaf and mountain hydrangeas can change color in response to the presence of aluminum in the soil, not the soil pH. Forget about adding a penny, nails, coffee grounds, or ...
Hydrangea flower color changes based on the pH in soil. As the graph depicts, soil with a pH of 5.5 or lower will produce blue flowers, a pH of 6.5 or higher will produce pink hydrangeas, and soil in between 5.5 and 6.5 will have purple hydrangeas. Hydrangea flower color can change based on the pH in soil.
Most hydrangeas prefer moist, well-drained soil and partial sun. To help, we chatted with a master gardener to find out which plants make the best companion plants for hydrangeas. Meet the Expert
Hydrangea macrophylla by Abraham Jacobus Wendel, 1868. Hydrangea macrophylla is a species of flowering plant in the family Hydrangeaceae, native to Japan. It is a deciduous shrub growing to 2 m (7 ft) tall by 2.5 m (8 ft) broad with large heads of pink or blue flowers in summer and autumn. [2]
Hydrangea serrata is similar to H. macrophylla except it is a smaller more compact shrub with smaller flowers and leaves; it is also more hardy. With a rounded habit, it features dark green, serrated (toothed), ovate leaves to 15 cm (6 in) long, and clusters of long-blooming blue or pink lacy flowerheads in mid- to late summer.