Invasive Plants to Avoid in Rhode Island and Planting Alternatives: A List of 20 Native Species

Invasive plants pose a peril to Rhode Island's native ecosystems and economy, as they lack natural enemies like predators or diseases indigenous to the region.

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2025 September 23 . 2:13 PM

2 min read

Intrusive Plant Species to Watch Out in Rhode Island, and Alternative Native Plants to Consider

Invasive Plants to Avoid in Rhode Island and Planting Alternatives: A List of 20 Native Species

In Rhode Island, several invasive plant species have made their way into gardens and garden stores, posing a threat to local ecosystems. These unwelcome guests include Japanese knotweed, multiflora rose, garlic mustard, mile-a-minute vine, and bush honeysuckles, all of which were introduced to the U.S. mainly in the 19th and early 20th centuries.

One of the most notable invasive plants is Japanese knotweed (Fallopia japonica). This plant grows three to 10 feet tall and can spread rapidly through rhizomes and sprouting root fragments. Japanese knotweed features broad, alternate leaves with a flat base and pointed tip, and smooth, hollow stems with swollen joints.

Another invasive species to be aware of is Porcelainberry. Its foliage resembles grape leaves, with three to five lobes per leaf and slightly hairy undersides. Porcelainberry can climb trees and form dense mats over vegetation.

English ivy (Hedera helix) is another invasive plant that forms dense, weed-excluding mats on the ground and climbs into tree canopies. English ivy has waxy, dark green leaves that range from unlobed to having as many as five lobes.

However, not all is lost for garden enthusiasts. There are several native alternatives to these invasive plants that can help maintain a balanced ecosystem. For instance, Virginia creeper makes for a good alternative vine.

Morrow's honeysuckle (Lonicera morrowii) is a woody perennial shrub with creamy white to yellow tubular flowers that bloom in pairs in early spring. Bush honeysuckle (Diervilla sessilifolia) is a native shrub similar to Morrow's honeysuckle.

Lastly, Bearberry is an attractive native evergreen ground cover that can add a touch of beauty to any garden without posing a threat to the local ecosystem.

By being mindful of these invasive plants and opting for native alternatives, gardeners can help protect Rhode Island's natural habitats and preserve its biodiversity.