Avoid Purchasing These 11 Intrusive Plant Species at Nurseries
In the world of gardening, some plants may seem appealing at first glance, but their invasive nature can cause significant harm to native vegetation and the environment. Here's a rundown of some invasive plants to be wary of, along with some alternatives to consider.
Scotch broom (Cytisus scoparius)
Growing in USDA zones 5-8, this plant with cheerful yellow flowers can spread aggressively, choking out native plants. It emits a toxic chemical in the soil that may prohibit other plants from growing. If you're looking for alternatives, consider dianthus, hardy geranium, or creeping phlox.
Japanese barberry (Berberis thunbergii)
This shrub with purple or red foliage is now considered invasive in some areas, particularly in eastern North America. It thrives in full sun to deep shade in USDA zones 4-8. Japanese barberry has been shown to have a role in the spread of Lyme disease. The larger the number of Japanese barberry in an area, the higher the incidence of Lyme disease-carrying ticks. Control takes persistence and involves hand pulling or digging early in the season, before the seed drops.
Japanese honeysuckle (Lonicera japonica)
A climbing vine covered with sweetly scented flowers in spring, Japanese honeysuckle is an invasive weed in USDA zones 4-11. It suppresses the growth of native plants and ultimately damages the environment around it. Japanese honeysuckle is easily spread to other areas by birds, who love to feast on its berries.
Mexican evening primrose (Oenothera berlandieri)
Thriving in USDA zones 4-9, this plant may draw you in with its delicate pink flowers, but it can quickly get out of hand. It has been known to outcompete other plants in a flower bed and even take over grassy lawns. Dianthus, hardy geranium, and creeping phlox are all terrific low-growing alternatives to Mexican evening primrose.
English ivy (Hedera helix)
A non-native plant that is now considered invasive in many states, English ivy's aggressive foliage can smother native vegetation and cause extensive damage to natural areas, walls, and structures. It is difficult to kill English ivy, so the best course of action is to avoid planting it in the first place.
Barberry substitutes
If you're looking for red or purple foliage alternatives to Japanese barberry, varieties of weigela and ninebark are great options.
When researching invasive plants in your region, state extension services are a great place to start. It's essential to remember that the term invasive is relative and dependent on your region and geographical climate.
Lastly, many types of honeysuckle will prove welcome additions to the garden if chosen carefully. Always do your research and consider the potential impact of a plant before bringing it into your garden.
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