Both lily-of-the-valley plants and trumpet vines are grown for ornamental purposes due to their glossy, attractive foliage and colorful blossoms. Without proper maintenance, the plants sometimes escape their boundaries and turn invasive, presenting a weed problem to the backyard landscaper. Lily-of-the-valley is also poisonous if consumed. Take measures to kill lily-of-the-valley and trumpet vine plants to restore your yard's safety and beauty.
Use pruning equipment such as a machete or pruning shears to cut back the plant to expose its base. Lily-of-the-valley plants can grow dense foliage that hides the stem, while trumpet vines can send out long tendrils that can form confusing entanglements over their base.
Dig out the lily-of-the-valley or trumpet vine by hand. This is best if the plants are juvenile and not widespread. Grasp the plant at its base and pull upward, or use a spade for faster removal of plants that have longer root systems.
Spray the lily-of-the-valley or trumpet vine with a glyphosate-based herbicide. This is ideal if the plant is too established for easy manual removal or if you're faced with many plants for which manual removal would take too much time. Spray the herbicide on all exposed surfaces of the lily-of-the-valley or trumpet vine according to the herbicide's label, as toxicity varies by product. The plant will die within 10 to 14 days.
Replant the sprayed area with new vegetation three weeks after applying the herbicide to prevent new weeds from growing in where the lily-of-the-valley or trumpet vine once grew.