Japanese Hops
Humulus japonicus

Family: Cannabaceae
Genus: Humulus (HUM-uh-lus) (Info)
Species: japonicus (juh-PON-ih-kus) (Info)

Category:

Annuals

Vines and Climbers

Height:

6-8 ft. (1.8-2.4 m)

Spacing:

6-8 ft. (1.8-2.4 m)

8-10 ft. (2.4-3 m)

10-12 ft. (3-3.6 m)

12-15 ft. (3.6-4.7 m)

15-20 ft. (4.7-6 m)

Hardiness:

Unknown - Tell us

Sun Exposure:

Full Sun

Sun to Partial Shade

Danger:

Handling plant may cause skin irritation or allergic reaction

Plant has spines or sharp edges; use extreme caution when handling

Bloom Color:

Green

Bloom Time:

Mid Summer

Late Summer/Early Fall

Mid Fall

Foliage:

Deciduous

Other details:

May be a noxious weed or invasive

Soil pH requirements:

Unknown - Tell us

Patent Information:

Non-patented

Propagation Methods:

By dividing rhizomes, tubers, corms or bulbs (including offsets)

Direct sow as soon as the ground can be worked

From seed; direct sow after last frost

From seed; germinate in a damp paper towel

Seed Collecting:

Properly cleaned, seed can be successfully stored

Regional

This plant has been said to grow in the following regions:

Cole Camp, Missouri

Sedalia, Missouri

Puyallup, Washington

Gardeners' Notes:

0
positives
0
neutrals
2
negatives
RatingContent
Negative

On Feb 21, 2014, coriaceous from ROSLINDALE, MA wrote:

Two states have banned the trade, transport, or planting of this species due to its invasiveness.

Negative

On Jan 10, 2009, creekwalker from Benton County, MO (Zone 5a) wrote:

This plant is an alien and can be invasive. I particularly do not like this plant due to the firey red welts it causes on my skin from a mere brush against it. It has bristles on the leaves and stems that "grab" ahold of you.

Here is a web site with more information on this plant.
http://dnr.wi.gov/news/Weekly/Article_Lookup.asp?id=2663