|
Japanese
Knotweed –
What
to Plant in its Place |
It
is important to rapidly establish
native or non-invasive plants
to control knotweed and stabilize
the soil. Knotweed seedlings
do not compete well with other
vegetation.. Prior to planting
or seeding the area, it might
be best to wait a full growing
season to see if any native
or non-invasive plants, which
were stored in the seed bank,
revegetate the area naturally.
This will save you time and
money. However, whether or
not you decide to seed or plant,
you must continue to monitor
the area and treat resprouts
or new invasions of knotweed
as soon as they appear.
The
following is a suggested list
of native and/or non-native,
non-invasive plants to plant
in areas where knotweed grows.
Consult your neighbors, local
nurseries, garden clubs, or
the internet for more suggested
plantings. Always check first
for the potential invasiveness
of any new plant to be sure
you don't give yourself more
problems.
Trees
(suggested
because they are fast
growing): |
|
Dogwoods
(establish quickly)
Silky
and Gray Dogwoods (aggressive
spreaders)
Willows
(establish quickly)
Birches
Alders
Poplars
Sycamore
(grows quickly)
Ninebark
Sourgum
Black
gum
Sweet
gum
Aspen
Black
locust
Blackcherry
Tulip
poplar
Pin
oak
White
pine
Silver
maple
Shrubs
(suggested
because they are hardy,
with dense branches
and lots of leaves) |
|
Viburnums
(such as Arrowwood)
Shadbush
Bayberry
Chokeberry
Willows
(plant near water bodies)
Box
elder (grows in moist soils)
Sweet
pepperbush (grows in moist soils)
Herbaceous
vegetation
(suggested
where winter ice removes
woody vegetation)
|
|
Black-eyed
susan
Black
cohosh
Wild
rye
Virginia
Wild rye (perennial, tolerates
shade, found in moist, wooded
areas and riparian zones) *thick
litter layer may prevent some
seed germination
Riverbank
Wild rye (grows well in scoured
riverbanks)
Blue
stems
Big
Blue stem (deep, fibrous root
system may give them some advantage)
Switchgrass
(deep, fibrous root system may
give them some advantage)
Indian
grass
Joe-pye
weed (perennial wildflower needing
full sun, average to moist soils,
tall to overgrow knotweed, showy)
New
York Ironweed (perennial wildflower
needing full sun, average to
moist soils, tall to overgrow
knotweed, showy)
Fowl
Blue grass (perennial, normally
found in wet areas) *thick litter
layer may prevent some seed
germination
Prepared
by DRIPP (the Delaware River
Invasive Plant Partnership)
for the Sept. 27, 2003 Upper
Delaware Knotweed Community
Awareness Workshop. This list
is only meant to suggest some
of the many plant options that
you could consider. Please contact
your local nursery, garden club,
or the internet for more information.
To learn more about DRIPP, contact
Joanne Steinhart, DRIPP Project
Manager, at 570-643-7922,x12, jsteinhart@tnc.org.
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