Perennials – General Information Herbaceous Perennials search site – Cornell University Herbaceous Perennials fact sheets – Michigan State University Herbaceous Perennial Production – University of Vermont Growth Retartant Efficacy Trials on Perennials - Michigan State University Complete Flower induction table – Michigan State University Overwintering Containerized Perennials – University of Massachusetts Preventing Rodent Damage to Overwintering[Read More…]