image description — Avoid exotic, invasive plants like Oriental bittersweet and multiflora rose. These plants may have attractive berries, but they can cause severe damage to native plants, shrubs, and trees.

MassWildlife: Avoid decorating with invasive plants

12:19PM / Sunday, December 10, 2023Print Story | Email Story

During the holiday season, many people use plants to decorate their homes or businesses. If you wish to use plants in your decorations, be sure to select native species such as native pines, spruces, hemlock, American holly, mountain laurel, fir, or winterberry holly.

Avoid exotic, invasive plants like Oriental bittersweet (Celastrus orbiculatus) and multiflora rose (Rosa multiflora). These plants may have attractive berries, but they can cause severe damage to native plants, shrubs, and trees. Invasive plants can spread quickly in open fields, forests, wetlands, meadows, and backyards, crowding out native plants that provide valuable wildlife habitat. Oriental bittersweet can even kill mature trees. Cutting and moving these invasive plants to make wreaths or garland can spread their seeds even more. Birds may also feed on the fruits hung for decoration and further spread the digested but still-viable seeds. Both plants are extremely difficult to control; when cut, the remaining plant segment in the ground will re-sprout and grow quickly. It is illegal to import or sell bittersweet and Multiflora rose in any form (plants or cuttings) in Massachusetts.

Get tips to identify Oriental bittersweet and multiflora rose below or click here to learn more about invasive plants in Massachusetts.

Oriental Bittersweet

Identification: A climbing deciduous, woody vine that can grow up to 60 feet long and up to 6 inches in diameter. It can also grow along the ground spreading orange-colored roots. Young stems are brown with warty lenticels (raised pores); bark of older plants appears gray. New twig growth is smooth and green. Leaves are rounded and are narrower at the base. Small greenish flowers bloom from May to June. Yellow-orange capsules are produced from July to October. Later in the fall, the seed covering splits open to reveal red-orange seeds.

Threat: Oriental bittersweet grows fast and wraps around nearby shrubs or trees. Native woody plants can be shaded out, strangled, or uprooted. It can reproduce by seed or through root suckers.

Multiflora Rose

Identification: A deciduous shrub with arching and scrambling stems that may grow up to 10–15 feet tall. The stems are red to green with scattered, broad-based prickles. Each leaf has 5–11 elliptical leaflets with sharply serrated edges. After the flowers fade in late summer, rose hips (resembling leathery red berries) are left on the plant and remain throughout the winter.

Threat: Multiflora rose grows in dense thickets and quickly outcompetes other plants. It can completely dominate abandoned fields or pastures. Each plant can produce half a million seeds and these may remain viable in the soil for up to 20 years.

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Pittsfield Man Creates Device to Clear Lakes of Algae Blooms

By Breanna SteeleiBerkshires Staff
08:07AM / Sunday, October 11, 2026

Marc Bellora holds a jar of lake water, left, to compare to water cleaned by his Aqua Clarifier Water System.

PITTSFIELD, Mass. — Marc Bellora has high hopes for a device he's created to treat lakes from harmful algae blooms.

His patented water clarifier can physically remove captured material rather than letting the nutrient-rich material settle back into the lake, which occurs when herbicides are used.

"It's a long-term lake management tool that can be used to reduce legacy nutrients in lakes and ponds over time," he explained. "We built the prototype, this is a prototype. It does approximately 65 to 70 gallons per minute. It's very environmentally friendly. Can be used with air only, or we can use a low-dose potable polyaluminum chloride (PACL) or chemical on board that can help improve results."

The water clarifier barge is based on well-proven technology for water treatment, he said. "It's a self-contained, portable, mobile unit that removes algae blooms, nitrogen, phosphorus, and the associated nitrogen and phosphorus within lakes."

Bellora founded Clear Waterways Group with business partner Mark Simon. They built a prototype mobile unit and are still working out the kinks. It's taken Bellora about five years to bring the project to fruition as he is also a full-time Realtor.

He says the repurposed barge they use has a device that uses air to filter the water to separate harmful bacteria or uses a chemical at low doses. They are testing both to see how well each does at cleaning the water.

"They would do the same thing here, except they would spray it, and it blocks all that stuff together," Bellora said of the use of herbicides. "But then it drops to the bottom. So now all the nutrients that are attached in that plot go to the bottom and contribute to the legacy nutrients only to fuel next year's bloom. Ours removes it."

He said just using air alone has removed 70 to 90 percent of harmful algae where he has been operating on the south end of Pontoosuc Lake.

"Essentially, we take in the bad stuff, we take in the lake water. We separate the good stuff from the bad stuff. Clean water goes back into the lake, and the bad stuff can either be composted, or it can be taken to the wastewater treatment plant, which is what we're doing here," he said.

Bellora explained that tiny air bubbles attach to particles in the water, making them buoyant so they rise and can be removed. The unit can operate with air alone, or with a low dose of potable polyaluminum chloride.

PACL helps through flocculation: it gathers small particles into larger clumps that are easier for air bubbles to capture. He said this can help remove dissolved nutrients that air alone may not capture as effectively.

Bellora said he was inspired to build something like this after noticing the lakes he enjoys being shut down because of algae blooms.

The city issued a health advisory for Pontoosuc in August, warning residents not to swim or come in contact with the lake water because of an algae bloom. The cyanobacteria can cause skin irritations, vomiting and diarrhea and nerve or liver problems.

Bellora previously worked for a company that used traditional dissolved air flotation (DAF) systems to treat water. In that role, he traveled around the country to work at paper mills and food-processing plants.

That experience gave him a practical understanding of DAF, and while flying between jobs, he would see green ponds and wonder whether the technology could be adapted to treat lakes.

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