The Knotweed Page!
  A web site devoted to information about Japanese Knotweed and related plant species
The Knotweed Page  |  All About Knotweed  |  Taming The Wild Knotweed  |  Knotweed Literature  |  Plant Native!

Recent greenhouse research with Japanese knotweed (Fallopia japonica) and related species

This is F. baldschuanica, also known as Polygonum aubertii or "Silver Lace Vine".
F. baldschuanica sets seed
Fallopia baldschuanica, Polygonum aubertii
The silver lace vine has set seed every summer in the University greenhouse, even in the month after it was first sent to me as a dried out root ball with bare stems. However, I have had no luck getting the seeds to germinate.

Mom (and Dad?) and Baby
F. japonica var. "Variegated", a horticultural variety available for sale in the U.S., which is male-fertile and can also produce seed.
variegated knotweed in flower

Offspring of F. japonica var. "Variegated"

F. japonica var. "Crimson Beauty" (note the red pigment in the vegetation and inflorescences), also available for sale in the U.S.
F. japonica var. 'Crimson Beauty'
F. japonica Crimson Beauty in fruit
Crimson Beauty produces shorter, rounder fruits than wild F. japonica, and the fruits have a pink tinge to them.

Knotweed seedlings compete for light and space in the growth room at the UMB Greenhouse.
One of 7 trays of tiny knotweed seedlings
female offspring with developing fruitmale offspring in flower
Offspring grown from seed to adulthood were a mixture of male and female plants. On the left is a female plant with developing fruit, and on the right is a male plant in flower.

Back to Jenn's Web Garden
All photos, scanned images and graphics are the property of Jennifer Forman and may not be reproduced in any way without express permission from her.