Ragweed

Ambrosia artemisiifolia

Ragweed (Ambrosia artemisiifolia) is an annual plant native to North America that has now naturalized and grows wild in various regions around the world.
 - Growth Characteristics:
- It typically grows to a height of 30 to 150 cm, and its stems and leaves are rough and hairy.
- The leaves are deeply pinnately divided and arranged alternately.
- The flowers change from green to brown, bloom between August and October, and reproduce through pollination.
 - Propagation Methods:
- It primarily reproduces by seeds.
- Seeds that mature in the autumn fall into the soil and germinate the following spring.
- It has a very strong reproductive capacity, as a single plant can produce thousands of seeds.
 - Cultivation Methods:
- It is generally not cultivated in agriculture or gardens, but it can be artificially grown for ecological research. - When cultivating, it is recommended to select a location with well-drained soil and plenty of sunlight.
 - Use in the Garden:
- It is generally not used as a garden plant. Rather, it is a target for removal as it can hinder the growth of other plants and produce allergens.
 - Major Pests and Control Methods:
- It is relatively hardy, so serious pest problems are rare, but it may occasionally be attacked by aphids or certain insects.
- Control methods include physical removal (pulling up by the roots), mowing, and the use of herbicides if necessary.
- To reduce reproductive capacity, it is effective to remove it before the seeds mature.

Ragweed requires management as it has a high potential to cause allergies and can disrupt the ecosystem. It is advisable to choose other, more beneficial plants for gardens.

Plant Family	Asteraceae
Height	1~2m
Colors	green
Bloom Period	August~September
Water Needs	commonly
Exposure	Sunny
Freezing Resistance	-30°C

Maple leaf pigweed
Ambrosia trifida

shadberry
Amelanchier asiatica