Cityline hydrangea is a deciduous shrub that is native to Asia. The plant has large, dark green leaves and produces white or pink flowers in the summer. Hydrangeas are popular ornamental plants and cityline hydrangeas are commonly used in landscaping. The plants are easy to care for and require little maintenance.
Related plant:
Cityline Paris Hydrangea
Related plant:
Cityline Mars Hydrangea
About soil condition, the cityline hydrangea grows best in rich, well-drained soil with a pH of 5.5 to 6.5. It tolerates some shade, but performs best in full sun. Be sure to water regularly during the first growing season to establish a deep, extensive root system.
So, like the other hydrangeas, the cityline hydrangea needs at least 4 hours of sun each day to produce the best blooms. If you live in an area with very hot summers, it's best to plant this hydrangea in a spot that gets some afternoon shade.
The temperature condition that is ideal for cityline hydrangeas is between 60 and 70 degrees Fahrenheit. Cityline hydrangeas thrive in humid environments, so they are often found in cities with high humidity levels. They can tolerate brief periods of cooler temperatures, but they will not tolerate prolonged periods of cold weather.
Ideal humidity condition for this plant is 50%. If the humidity is too low, the leaves will begin to wilt and the flowers will drop. If the humidity is too high, the leaves will begin to yellow and the plant will become overall stressed.
Mentioning fertilizer, usually the plant food that is applied to cityline hydrangeas is a water-soluble, well-balanced fertilizer that is applied every two weeks during the growing season. A 10-10-10 or 12-12-12 fertilizer is fine. If you are using a fertilizer with a lower middle number, such as 5-10-5, then use it at half the recommended rate. A good way to know if your cityline hydrangea needs fertilizer is to dig up a shovelful of soil from around the plant and look at the handful of soil. If the soil is dark and crumbly, it probably doesn't need fertilizer. If the soil is light colored and sandy, it probably needs fertilizer.
Pruning is an important part of keeping your cityline hydrangea looking its best. You should prune in early spring, before new growth begins. Cut back any dead or damaged branches, and then trim back the remaining branches by about one-third. This will encourage new growth and help keep your plant compact and full.
Propagation is typically done via rooting stem cuttings taken from the desired plant. The cuttings should be 6-8 inches long and taken from new growth. The bottom leaves should be removed and the cutting should be placed in moistened potting mix. The cutting should be placed in a humid environment and the potting mix should be kept moist. After a few weeks, the cutting should develop roots and can be transplanted to a new pot or location.
Usually, the plant growth rate is reported as being between 1 and 2 feet per year. However, some gardeners have found that their cityline hydrangeas have grown much more quickly than that. One gardener reported that her cityline hydrangea grew 4 feet in one year!
Common problems for this kind of plant are aphids, mites, and whiteflies. These pests are usually controlled with insecticidal soap or horticultural oil. However, if the infestation is severe, you may need to use a stronger insecticide. Also, powdery mildew can be a problem, especially in shady, humid conditions. To prevent powdery mildew, make sure the plant has good air circulation and avoid overhead watering. If powdery mildew does occur, you can treat it with a fungicide.
Source:
Hydrangea - North Carolina Extension Gardener Plant Toolbox
Take a Look at Hydrangeas - Penn State Extension
Selecting Hydrangeas for the Home Landscape | Ohioline
