![]() Canada thistle can spread quickly, so early detection and removal is important. The flowers are purple and grow in clusters. ![]() The leaves are dark green and have a spiny margin. This perennial weed has a deep root system that can make removal difficult. Canada Thistle or Creeping Thistle (Cirsium arvense). Be sure to check your garden regularly for this weed as it can quickly take over. If the weed has already gone to seed, you can dig up the entire plant and dispose of it in the trash. Make sure to wear gloves when handling this weed as the sap can cause skin irritation. The best way to remove black nightshade is to pull it up by the roots. If ingested, it can cause stomach pain, vomiting, and diarrhea. This weed is often confused with the edible nightshade (Solanum lycopersicum), but the black nightshade is poisonous. It has small, dark green leaves and produces small white or purple flowers. The black nightshade is a annual herb that grows up to two feet tall. ![]() This pesky weed can be found in gardens, landscapes, and even potted plants. What are the tall weeds with purple flowers called?.Musk Thistle or Nodding Thistle (Carduus nutans). Dove’s-Foot Crane’s-Bill (Geranium molle). Creeping Charlie or Ground Ivy (Glechoma hederacea). Common Thistle/Spear Thistle/Bull Thistle (Cirsium vulgare). 31+ Gorgeous Built-in Planter Box Ideas.31+ Repurposed Old Door Ideas For Your Backyard.33+ Beautiful Vintage Garden Decor Ideas.90+ Small Patio Decorating Ideas on a Budget.
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