... What you have is known as an Ivy Ball. It was a vase used to start ivy.
Terry â€” I am mystified. How does a raised round ball start ivy? And why? I only need to leave my garden unattended for a few weeks, and ivy has devoured my potting shed, all the other plants in the garden, and, triffid-like, is trying to take over our home. You can't compost ivy prunings as it poisons other plants (well you can, but it takes forever to get rid of the poison).
The only reasons we allow it to grow is that it covers an unsightly modern wall and that it provides a valuable food source and habitat for small birds, such as wrens, blue and great tits, song thrushes, and our blackbirds (different species to yours, I believe), particularly during the worst of the winter. There is nothing quite so fascinating as watching a pair of wrens working the ivy and the fern border below.