Whorled leaf attachment is where three or more leaves attach at each point or node on the stem. The opposites are maple, ash, dogwood, paulownia buckeye and boxelder (which is really a maple).

For many cats, a mere whiff of catnip can send them into a licking, rolling, plant-shredding frenzy. Masao Miyazaki, a biologist at Iwate University in Morioka, Japan, and his colleagues analyzed ...

Most cat owners know catnip as a treat for their feline friends to roll in and chew, but a new study finds that the common herb has qualities that repel mosquitoes.