Small-headed knotweed 'Red Dragon'

Persicaria microcephal 'Red Dragon'

Knotweed 'Red Dragon' (Persicaria microcephala 'Red Dragon') is a popular ornamental plant known for its beautiful leaf patterns and unique colors. The following is information regarding this plant's growth characteristics, propagation methods, cultivation methods, garden uses, and major pests and diseases, as well as control methods.

Growth Characteristics
- Leaves: This plant features elongated leaves with various red and purple patterns.
- Growth Habits: As a perennial herbaceous plant, it can grow up to approximately 60 cm above the ground.
- Environment: It thrives in sunny, well-drained soil. While it tolerates partial shade, locations with ample sunlight are preferred.
- Cold Hardiness: It is relatively cold-hardy and tolerates cold climates well.

Propagation Methods
- Seeds: It can be propagated by seeds, but this method can be time-consuming.
- Cuttings: This is the most common propagation method; healthy stems are cut in spring or early summer and planted in water or soil to encourage rooting. - Division: This is a method of propagation by dividing mature plants, performed in spring or autumn.

Cultivation Methods
- Planting: It is best to plant in spring or autumn. Maintain a spacing of approximately 30–45 cm between plants.
- Watering: Maintain adequate moisture levels normally, but avoid overwatering.
- Fertilizer: It is recommended to use low-nitrogen, slow-release fertilizer in the spring.

Utilization in the Garden
- Border Planting: Plant along the borders of flowerbeds or pathways to create visual boundaries.
- Containers: Plant in pots or containers to grow on verandas or terraces.
- Mixed Planting: Use various leaf colors to create a contrasting effect with other plants.

Important Pests and Diseases & Control Methods
- Diseases: It is susceptible to fungal diseases, and root rot may occur if care is neglected. Pay attention to drainage during the rainy season. - Pests: Aphids and scale insects may occur, so it is recommended to use insecticides regularly.
- Control Methods: In the case of fungal diseases, remove affected leaves and spray appropriate pesticides if necessary. For pest control, remove the plants upon early detection or use suitable insecticides.

If you fully understand and practice these care methods, the 'Red Dragon' can provide a stunning visual effect in your garden.

Plant Type
Plant Family	Knotweed family
Height	60~90cm
Spread	60~90cm
Colors	red, green
Bloom Period	July~August
Water Needs	commonly
Exposure	Sunny
Freezing Resistance	-10°C

Polymorpha
Persicaria polymorpha

Virginia Spike
Persicaria virginiana