Article in English: Hydrangeas will begin to wilt if the soil gets too dry, so make sure you water them every day or two, especially during the hot summer months. Water the hydrangeas near the base of the plants and above the roots, rather than spraying the water directly onto the flowers; this prevents the flowers from getting burned by the sun. New hydrangeas do not need to be pruned; if you do so, you may not get new blossoms the following spring. If you have older hydrangeas that have gotten quite large and need to be cut back, make sure you prune at the right time of year according to the variety of hydrangea you planted.  Bigleaf hydrangea varieties should be pruned after the blossoms have faded in the late summer. Pee Gee Hydrangea (H. paniculata), also known as Panicle, are best pruned in late winter or early spring or fall. This variety blooms on the current season’s wood, so go easy on pruning. Don’t cut to the ground unless your bush is getting too big. Annabelle Hydrangea (H. arborescens) can be lightly pruned in the summer after the spring bloom, or cut down to the ground in late winter. Oakleaf and other hydrangeas that bloom on the current season's wood should be pruned while the plant is still dormant, in late winter or early spring, before the blooms emerge. . Cover them with mulch, straw, or pine needles to a depth of at least 18 inches (45.7 cm). If you have smaller bushes, you can cover the entire plant for the winter. Remove the cover in early spring, after the last frost. Use chicken wire or some other small fence like cage to help mulch stay around plant’s crown. The color of hydrangeas depends on the pH of the soil in which they are planted. If you have pink or blue hydrangeas, it's possible to change their color by changing the soil's pH. This can take weeks or months, so be patient!  Wait until your plant has been in the garden at least two years before attempting color change. To change flowers from pink to blue, lower the soil's pH by adding sulfur or peat moss. To change flowers from blue to pink...

Summary in Indonesian:
Jaga tanah tetap lembap. Pangkas bila diperlukan. Lindungi hydrangea selama musim dingin. Ubah warna hydrangea.