What's the matter with the yellowing leaves of Marguerite daisy?

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Marguerite daisy, also known as Argyranthemum frutescens, or maiden flower, is a perennial shrub plant of the genus Argyranthemum in the Asteraceae family. Its unique ornamental value and wide adaptability make it very popular in the horticultural field.
Growth characteristics of Marguerite daisy:
Marguerite daisy is a perennial shrub plant, which means it can continue to grow and bloom in multiple growth cycles. Once planted, as long as it is properly managed, its beautiful flowers can be enjoyed for many consecutive years, providing long-term ornamental value for gardening enthusiasts.
In its seedling stage, Marguerite daisy is similar to a herbaceous plant, but as it grows, its branches gradually become lignified and turn into woody plants. It can reach a height of one meter, has a strong branching ability, and can naturally form a compact and beautiful tree shape without excessive pruning. Marguerite daisy has abundant flowers, with each branch bearing flowers, and they bloom uniformly, making it extremely ornamental.
The pruning of Marguerite daisy is an important means to maintain its beautiful plant shape, promote new growth, and increase the amount of flowering. According to its growth habits and flowering characteristics, the pruning time is usually chosen in spring and early summer.
Spring pruning: In early spring, when the new growth just starts, it is an excellent time for pruning. Pruning at this time can remove the dead or damaged branches that may appear during winter, avoid nutrient waste, and create better conditions for new growth. In addition, spring pruning is also a good opportunity to shape or limit the size of the plant, and appropriate pruning can be carried out according to personal preferences and gardening needs.
Early summer pruning: If Marguerite daisy blooms in spring, then early summer after the flowering period is also a good time for pruning. Pruning at this time can remove the withered flowers, avoid the continuous consumption of nutrients on the withered flowers that have lost their ornamental value. At the same time, early summer pruning can also stimulate the plant to produce more new growth and lateral buds, preparing for the next round of flowering.
Precautions:
• Avoid pruning in late autumn and winter: Pruning in these two seasons may stimulate the growth of new tender branches, and these tender branches are easily damaged in the low-temperature environment, which is not conducive to the overwintering of the plant.
• Pruning tools and techniques: Clean and sharp tools should be used during pruning to reduce the damage to the plant. Try to prune in the early morning or on cloudy days to avoid excessive evaporation of the wound area caused by direct sunlight.
• Post-pruning maintenance: Appropriate watering and fertilization should be carried out after pruning to help the plant recover quickly. At the same time, strengthen the daily maintenance management to maintain appropriate soil humidity and light conditions.
As a perennial shrub plant, Marguerite daisy has won the favor of many gardening enthusiasts with its abundant flowers and compact and beautiful tree shape. Through reasonable pruning and management, its ornamental value can be further enhanced.

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