Cultivation Methods and Precautions for Hydrangea macrophylla
Today's focus is to introduce the cultivation methods and precautions for Hydrangea macrophylla and the cultivation methods and precautions for Bougainvillea spectabilis. Hydrangea macrophylla has full and large, beautiful flowers, with colors that can be red or blue, making it a pleasure to the eyes and refreshing to the spirit. It is a common potted ornamental tree, and those who have not cultivated Hydrangea macrophylla may have questions about how to care for it. Let's follow [Shan Cao Xiang Flower Care] to see what are the cultivation methods and precautions for Hydrangea macrophylla.
Cultivation Methods for Hydrangea macrophylla
We mainly look at how to take care of Hydrangea macrophylla from four aspects: soil, fertilization, watering, and sunlight.
Soil
Hydrangea macrophylla is suitable for growing in fertile, well-drained acidic soil. The pH level of the soil has a significant effect on the color of the flowers; when the soil is acidic, the flowers are blue; when the soil is alkaline, the flowers are red. It is better to cultivate Hydrangea macrophylla in acidic soil (pH 4-4.5 is ideal).
Fertilization
Hydrangea macrophylla enjoys fertilizer. During the growing period, generally apply a thin, decomposed cake fertilizer water every 15 days.
To maintain the acidity of the soil, 1%-3% ferrous sulfate can be added to the fertilizer solution; regularly watering with alum fertilizer water can make the plant lush and green; applying 1-2 times of potassium dihydrogen phosphate during the bud formation period can make the flowers large and colorful; the application of cake fertilizer should avoid the dog days of summer to prevent diseases and pests and damage to the roots.
Watering
Hydrangea macrophylla has large leaves and lush branches, requiring a lot of water. During the growing seasons of spring, summer, and autumn, water sufficiently to keep the potting soil moist. In hot summer weather, due to high evaporation, in addition to watering enough, water should also be sprayed on the leaves every day; Hydrangea macrophylla has fleshy roots, so watering should not be excessive, and avoid waterlogging in the pot, otherwise, the roots will rot; after September, as the weather gradually cools down, gradually reduce the amount of watering.
Sunlight
Hydrangea macrophylla is a short-day plant, forming flower buds after more than 10 hours of darkness per day for about 45-50 days. During normal cultivation, avoid direct sunlight, and 60%-70% shading is ideal.
Precautions for Cultivating Hydrangea macrophylla
Disease and Pest Control
The main diseases include wilt disease, powdery mildew, and leaf spot disease, which can be controlled by spraying 65% wettable powder of zinc omadine 600 times solution. The main pests are aphids and thrips, which can be controlled by spraying 40% omethoate emulsion 1500 times solution.
Spring Care
For potted plants, prune dead branches and repot with new soil. After the plant has adapted, apply 1-2 times of thin liquid fertilizer with a nitrogen-based formula to promote the growth of branches and leaves.
Cultivation Methods and Precautions for Hydrangea macrophylla
Summer and Autumn Care
Should be placed in a semi-shaded area or under a canopy to prevent direct sunlight and avoid yellowing and burning of the leaves. Apply 1-2 times of top dressing before and after flowering to promote green leaves and abundant flowers. After the flowers fade, promptly prune the flower stems to maintain an attractive appearance. Keep the potting soil moist but prevent waterlogging after rain to avoid root rot due to excessive moisture.
Winter Care
After entering winter, plants grown outdoors should be covered with soil for insulation to survive the winter safely; potted plants can be placed in a warm, south-facing location protected from cold winds. Although the leaves fall off in winter, the roots and branches remain alive, and new leaves will sprout in the following spring.
Propagation Methods for Hydrangea macrophylla
There are various ways to propagate Hydrangea macrophylla, usually through division, layering, and cutting.
Division
It should be done before the early spring sprouting. Separate the rooted branches from the mother plant and pot them directly. Do not water too much and keep them in a semi-shaded area until new buds sprout, then transfer to normal care.
Layering
It is done when the buds are swelling, and after 30 days, the plant can grow. Cut it from the mother plant in the following spring, transplant with soil, and it can bloom in the same year.
Cutting
It is done during the plum rain season. Cut the top tender branches, about 20 cm long, remove the lower leaves, and the suitable temperature for rooting is 13-18°C. Roots will form after 15 days.
Tissue Culture
Using dormant buds as the explant, after routine disinfection, inoculate them on MS medium supplemented with 6-benzylaminopurine 0.8 mg/L and indole acetic acid 2 mg/L to induce adventitious buds. When the seedlings are 2-3 cm tall, transfer them to 1/2 MS medium supplemented with indole acetic acid 2.0 mg/L to grow into complete small plants.
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