TERRESTRIAL INVASIVE SPECIES
Terrestrial Invasives
Plants alter natural habitat for other plants, wildlife, and pollinators. Invasives on Assembly Point include:
Japanese Knotweed
Purple Loosestrife
Oriental Bittersweet
Garlic Mustard
Japanese Barberry
Burning Bush
Bush Honeysuckle
Vines
Phragmites
Garlic Mustard: on the edges of Otyokwa along Cross Over Lane/Bay Parkway, and Lake Parkway
The plant
Flowers: Small (1/4 inch), white, 4 petals, on the end of the main stem and side branches, blooms April through June.
Leaves: Heart-shaped to triangular, 1-3 inches wide, coarsely toothed on edges, alternate on the stem, give off a garlic odor when crushed. Height: Flowering stalks grow 1-4 feet tall.
Roots: Taproot is slender, white,and has a fibrous root system. Seeds: Capsules appear soon after flowering and quickly lengthen. Seeds are small, produced in a row inside the capsule, and black when ripe. More than 100 seeds per plant.
How plant is spread
Garlic mustard is spread through seeds and through remaining roots in the ground after harvesting.
How to eradicate plant
Purple Loosestrife: Cross Over Lane
The plant
Flowers: Tall purple spike made up of lots of little flowers blooms June through September.
Leaves: Narrow leaves, two pairs of leaves opposite along the stem. Leaves range in length from 1”=3”
Height: Stalks grow 2-8 feet tall. Roots: Fibrous root system.
How plant is spread
Purple loosestrife enjoys an extended flowering season, generally from June to September, which allows it to produce vast quantities of seed. The flowers require pollination by insects, for which it supplies an abundant source of nectar. A mature plant may have as many as thirty flowering stems capable of producing an estimated two to three million, minute seeds per year.
Purple loosestrife also readily reproduces vegetatively through underground stems at a rate of about one foot per year. Many new stems may emerge vegetatively from a single rootstock of the previous year.
How to eradicate plant
Plants alter natural habitat for other plants, wildlife, and pollinators. Invasives on Assembly Point include:
Japanese Knotweed
Purple Loosestrife
Oriental Bittersweet
Garlic Mustard
Japanese Barberry
Burning Bush
Bush Honeysuckle
Vines
Phragmites
Garlic Mustard: on the edges of Otyokwa along Cross Over Lane/Bay Parkway, and Lake Parkway
The plant
Flowers: Small (1/4 inch), white, 4 petals, on the end of the main stem and side branches, blooms April through June.
Leaves: Heart-shaped to triangular, 1-3 inches wide, coarsely toothed on edges, alternate on the stem, give off a garlic odor when crushed. Height: Flowering stalks grow 1-4 feet tall.
Roots: Taproot is slender, white,and has a fibrous root system. Seeds: Capsules appear soon after flowering and quickly lengthen. Seeds are small, produced in a row inside the capsule, and black when ripe. More than 100 seeds per plant.
How plant is spread
Garlic mustard is spread through seeds and through remaining roots in the ground after harvesting.
How to eradicate plant
- Hand Pulling – do not compost, plants must be bagged and sent to the dump as they continue to grow without
soil. If flower has set, follow instruction below for Cutting/Herbicides. - Cutting/Herbicides - Cutting plants a few inches above the soil surface leaving one set of leaves. Cut just after the flower stalks have elongated but before the flowers have opened can be effective in slowing seed production. Plants will put out a second set of growth containing new flowers. and may kill garlic mustard plants.
Remaining leaves selectively spray with an herbicide (glyphosate – Weed be Gone/Roundup) to kill remaining plant. Remember anything the herbicide touches will affect that plant too so selectively spray. Wear recommended protective gear and clothing.
Purple Loosestrife: Cross Over Lane
The plant
Flowers: Tall purple spike made up of lots of little flowers blooms June through September.
Leaves: Narrow leaves, two pairs of leaves opposite along the stem. Leaves range in length from 1”=3”
Height: Stalks grow 2-8 feet tall. Roots: Fibrous root system.
How plant is spread
Purple loosestrife enjoys an extended flowering season, generally from June to September, which allows it to produce vast quantities of seed. The flowers require pollination by insects, for which it supplies an abundant source of nectar. A mature plant may have as many as thirty flowering stems capable of producing an estimated two to three million, minute seeds per year.
Purple loosestrife also readily reproduces vegetatively through underground stems at a rate of about one foot per year. Many new stems may emerge vegetatively from a single rootstock of the previous year.
How to eradicate plant
- Hand Pulling – the preferred method.
- Herbicides with glyphosate – Weed be Gone/Roundup) to kill but only before flower has set. Remember anything the herbicide touches will affect that plant too so selectively spray. Wear recommended protective gear and clothing.
Japanese Knotweed
Our first project to eradicate Japanese Knotweed was a small project on a resident's property along the lake in 2015. (see slideshow below).Chemical injection was not an acceptable solution for these residents. Every year the homeowner culls reoccurring plants, and the site is relatively free of knotweed now.
Our first project to eradicate Japanese Knotweed was a small project on a resident's property along the lake in 2015. (see slideshow below).Chemical injection was not an acceptable solution for these residents. Every year the homeowner culls reoccurring plants, and the site is relatively free of knotweed now.
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2023: the APWQC took on a Japanese knotweed control project at the southern end of Lake Parkway. Click below for button to take you to a summary of that project. |
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After the eradication of invasives such as knotweed, native plants could be introduced.
Native Plants for Lake George Include:
Local suppliers of native plants
- Garden Time: 652 Quaker Rd, Queensbury, NY 12804 (518) 793-8555 www.gardentimeinc.com
- Lazy River Farms: 3620 State Rte 9, Warrensburg, NY 12885 (518)623-5726
- Mandy’s Spring Farm Nursery: 1637 County Rte 28, Granville, NY 12832(518) 642-3676
- Sweet Pea Farm Perennials: 121 Federal Hill Road, Bolton Landing, NY 12814 (518)644-3020,www.sweetpeafarmperennials.com•
- Toadflax: 1604 Saratoga Rd., South Glens Falls, NY 12803 (518)793-2886o www.toadflaxnursery.com
- Watkins Garden Center: 126 River St., Hudson Falls, NY 12839 (518)792-5217
| assembly_point_japanese_knotweed.docx |
| biocontrol.pdf |
| knotweed_by_mary_helen_okeeffe.docx |
