Answer: New ivy plants can sprout from even the smallest piece of root, so although you attempted to get all the roots out, apparently some remained. The roots have some stored energy and you can starve them out by cutting down every single sprout, as soon as it emerges and before it develops leaves. The more sprouts the roots have to develop, the more energy they use. As long as that spent energy isn't replenished through photosynthesis, the roots will eventually run out of energy and die out. Don't let any leaves develop and you'll hurry the process along. Another way to discourage the ivy is to lay a deep mulch over the bare soil. 4-5 layers of newspaper or weed barrier placed in the bed and then covered with the landscape rock should keep the ivy from sprouting. If you don't plan to plant anything in the bed for a while, you can use a vegetation killer (check your local garden center for products registered for use against ivy). Use the herbicide, cover the soil with newspapers or weed barrier, then put down your landscaping rocks. Best wishes with your landscape!
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