Question: I would like to plant pines in a location where walnut trees were removed two years. Is it still risky to plant here?
Answer: Fortunately, the substance called juglone that's released by walnut tree roots is toxic for only one year after the tree is removed. So, you can safely plant anything you like in that location.
Q&A Library Searching Tips
When singular and plural spellings differ, as in peony and peonies, try both.