Immortality

Ageratum houstonianum

Growth Characteristics of Ageratum houstonianum

Ageratum houstonianum is an annual herbaceous plant native to Mexico, primarily used for ornamental purposes. It typically grows to a height of 30 to 60 cm, and its ovate leaves grow opposite each other. Small flowers of various colors, including blue, purple, sky blue, and pink, cluster together to form a rounded shape.

Propagation Methods

Ageratum houstonianum is generally propagated by seeds. Germination takes approximately two weeks, and the optimal temperature for germination is 18–20°C. After sowing the seeds, lightly cover them with soil, and it is important to maintain a moist environment through consistent watering.

Cultivation Methods
- Sunlight: It requires sufficient sunlight, needing at least 6 hours of direct sunlight per day.
- Soil: While it prefers fertile, well-drained soil, it grows well in ordinary garden soil. - Watering: Water when the surface of the soil dries out, but avoid overwatering. A well-drained environment must be maintained.
- Fertilizer: During the growing season, it is recommended to apply compound fertilizer at monthly intervals.

Uses in the Garden
Because the Bullohwa (Sunflower) features a variety of abundant flower colors, it is suitable for planting in garden borders, flowerbeds, or pots. It is particularly popular when combined with other plants to create mixed flowerbeds.

Important Pests and Control Methods
- Diseases: Powdery mildew and gray mold may occur.
- Control Methods: Maintain proper ventilation, avoid excessive moisture, and use fungicides if necessary.
- Pests: Aphids and spider mites are the primary pests.
- Control Methods: Wash with water or scrub with soap and water, and use applicable natural or chemical insecticides if needed.

You can maintain a healthy and beautiful Bullohwa through proper care and pest prevention.

Plant Type
Plant Family	Asteraceae
Height	20~70cm
Spread
Colors	Purple, pink, white
Bloom Period	July to October
Water Needs	commonly
Exposure	Sunny
Freezing Resistance	-2°C

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