Jap. knot or Giant knot?

miketropicJune 22, 2014

Found this the other day and didn't know if it was jap. Knot or Giant knot..Anyone know how to tell the diff other than mature size?

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miketropic

leaves about the size of my hand

    Bookmark   June 22, 2014 at 11:36PM
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bubbleoffplumb(z6 NY)

if you scroll down the PDF,
there are some comparison notes and photos.
the flowers are different and the underside of japonica is less "hairy".
your plant looks a lot like F. japonica (japanese knotweed) to me.
With your closer observation, you should be able to tell for sure.

Here is a link that might be useful: identify F. japonica vs F. sachalinensis

    Bookmark   June 23, 2014 at 11:32AM
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miketropic

thank you for the linnk I will check it out

    Bookmark   June 24, 2014 at 1:16AM
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