Related: How to Grow a Lemon Tree Indoors for Delicious Citrus Year-Round Planting a black walnut tree next to a lemon tree will cause one—or both—to suffer. They produce a chemical toxin ...

On this winter edition of ID That Tree, Purdue Extension forester Lenny Farlee uses black walnut and eastern cottonwood twigs to show you tips on how to identify native Indiana trees with alternative ...