Humulus japonicus, known as Japanese hop, is an ornamental plant in the family Cannabaceae. Some authorities have it as a synonym of Humulus scandens.Originally native to East Asian countries such as China, Japan, Korea, and extending its habitat to Vietnam, it was imported to North America in the late 19th century as an ornamental. Since its arrival in North America, it has spread widely. It can be found throughout the Northeastern U.S. and eastern Canada, and considered an invasive species in North America. It also features on the list of invasive alien species of Union Concern since 2019. This means it can no longer be imported in the European Union. Additionally, it has become illegal to plant it, breed it, transport it, or bring it into the wild in all Member States.
Japanese hop is fairly disease-resistant and typically not prone to illnesses. Nevertheless, it can be affected by pests and diseases present in its environment. These problems are usually mild. For care, the plant needs moderate maintenance. It should be pruned regularly to keep a neat appearance and promote healthy growth. Fertilizing can also encourage flowering. Japanese hop is suitable for anyone with outdoor space, such as a garden or patio, and does not demand extensive experience in plant care. Grown indoors, it may require more care.
How to keep Humulus Japonicus.
Light
Japanese hop does best in a spot that receives sunlight for most of the day. Sunlight improves its vigor and growth. Although it can tolerate limited light, strong growth happens when it gets plenty of sun. Too much or too little sunlight can damage its development or health.
Temperature
Japanese hop originates from temperate regions and prefers temperatures between 68 and 100 °F (20 to 38 ℃). It withstands high summer heat but requires cooler winters to do well. It is recommended to adjust temperatures seasonally to match natural fluctuations.
Fertilizer
Japanese hop benefits from regular, light applications of fertilizer to encourage healthy foliage. Fertilize Japanese hop about once a month during the summer. Nitrogen is vital for leaf development, so providing nitrogen-rich sources helps Japanese hop thrive.
Botanical profile.
- Plant Type
- Vine, Herb
- Life Cycle
- Annual
- Genus
- Humulus
- Family
- Cannabaceae
- Hardiness Zone
- 3-11
- Mature Height
- 0.91 m to 6.1 m
- Mature Spread
- 2.13 m to 3.05 m
- Leaf Color
- Green
- Leaf Type
- Deciduous
- Flower Color
- Green, White, Yellow
- Flower Size
- 15.24 cm to 30.48 cm
- Bloom Time
- Early summer, Mid summer
- Planting Time
- Spring, Summer, Autumn, Winter
- Harvest Time
- Mid summer
Other names.
