So what exactly is a weed? Is it a plant that has weed in its name: goutweed, dockweed, chickweed? Not entirely. There are plenty of weeds that have seemingly innocuous names. Multiflora rose sounds pretty — many flowers. And it’s a rose isn’t it? Roses aren’t weeds. Well, they are when they take over everything in the landscape. Multiflora is considered an invasive.
Most plants have had some use at some point in history. And many so-called weeds have beneficial effects. Some repel insects and can be placed to protect other plants subject to those insects. Some are edible. Dandelions can be used in salads or made into tea. And some are poisonous — deadly nightshade, hemlock (beneficial only to those with suicidal or murderous intent).
Some common plants, such as English ivy, are considered weeds or even invasives, although ivy is carefully cultivated in the suburbs of Philadelphia. I keep it in check but I haven’t torn it out. It’s very useful: evergreen, covers bare spots, no fuss, it just does what it does without any attention from me. And I hope that it distracts my neighbors from the mess that is the rest of my landscape. (My neighbors’ yards, unlike mine, are all elegantly pruned, trimmed, and regularly nourished, but that’s another story.)
The standard tongue in cheek definitions of weeds are:
- A plant the use of which has yet to be discovered.
- A plant obsessed with sex (they do seem to grow much more vigorously than many plants purchased at some expense from the plant store).
But my favorite definition of a weed is a plant that’s growing where you don’t want it. In that case, it could be poison ivy or a broad-leafed grass in the middle of the lawn. Or it could be an antique tea rose.