They may be beloved for their ability to transform a garden, but be warned: there are several perennials you should never plant together. Ever.
We know, we know; it sounds like the missing rule from The Gremlins – keep them out of the light, don't give them any water, never feed them after midnight, and don’t plant these perennials anywhere near each other. Trust us, though; it’s one of those secret rules that all master gardeners abide by… even if they don’t tell us all about it.
