Arnold promise witch hazel is a beautiful, easy-to-grow plant that is perfect for any garden. With its distinctive, bright green leaves and pretty, yellow flowers, it is sure to add a touch of magic to any garden.
Related plant:
Hamamelis Arnold Promise
About soil condition, Arnold Promise Witch Hazel prefers well-drained soil, but it is not too choosy about soil type otherwise. It will thrive in sandy soil, loamy soil, or clay soil, as long as the drainage is good. This shrub is also tolerant of drought conditions, once it is established.
So, like the other Witch Hazel shrubs, the Arnold Promise Witch Hazel will do best in full sun to partial shade. It is a deciduous shrub, so it will lose its leaves in the fall, but that just gives you a better view of the bright yellow flowers that appear in the late winter and early spring.
The temperature condition of the witch hazel is very important. If the temperature is too hot, the witch hazel will evaporate and the plant will die. If the temperature is too cold, the witch hazel will not be able to produce the necessary oils and the plant will die.
Ideal humidity condition for this plant is around 40%. If the humidity level drops below 30%, the leaves will start to turn brown and crisp. If the humidity level gets too high, around 60%, the leaves will start to yellow and drop off.
Mentioning fertilizer, this type of plant doesn't need much. In fact, too much fertilizer can actually hurt it. You're better off using a low-nitrogen fertilizer or even compost. As for the roots, they like to stay on the drier side. Arnold Promise Witch Hazel thrives in well-drained soil.
Pruning is an important part of keeping your witch hazel healthy and looking its best. Prune in early spring, before new growth begins. Cut back any dead or diseased branches, and thin out crowded areas to allow for better air circulation.
Propagation is best done by rooting softwood cuttings taken from the plant in late spring or early summer. Fill a planting container with a moistened soilless potting mix and make a slit in the mix with a sharp knife. Dip the base of the cutting in rooting hormone and insert it into the slit in the potting mix. Firm the mix around the cutting and water it well. Place the container in a warm, bright location out of direct sunlight and keep the potting mix moist. Cuttings should root in four to six weeks. Once the cuttings have rooted, transplant them to individual pots filled with a soilless potting mix.
Usually, the plant growth rate is achieved during the first three years after planting. After that, the plant's growth rate will depend on the climate and growing conditions. In general, arnold promise witch hazel prefers full sun and well-drained soil. It is tolerant of a wide range of soil types, but it will not tolerate wet or soggy conditions.
Common problems for this kind of plant are: crown dieback, twig dieback, leaf drop, and witches' broom. These problems are caused by different species of fungi. Crown dieback is caused by the fungus Phomopsis arnoldiae, and twig dieback is caused by the fungus Diplodia pinea. Leaf drop is caused by the fungus Pythium ultimum, and witches' broom is caused by the fungus Taphrina japonica.
Source:
Witch Hazel - Washington State University
Arnold & Hazel Donald: Always giving back | McKelvey School of ...
Witchhazel | Yale Nature Walk
