Keystone Plants Maximize Small Spaces

Yards are getting smaller and the conversion of natural habitat to residential communities is shrinking the availability of native plants to support native insects. While we should protect native habitat as our first choice for supporting native insects, we have learned that we can make a difference in our designed landscapes by choosing the most productive plants. 

“Keystone” is the term for the most productive plants in terms of how much they support insect herbivores such as caterpillars, the larval form of butterflies, moths, and sawflies. The more insects a plant can support, the more productive it can be for the local ecosystem that depends on those insects (like birds).

Native Clematis

It’s too hot and dry to plant now, but you might be thinking of what you’ll buy and plant in the fall so now is a good time to make a list. Including some keystone plants would help you take your efforts further than without them. 

I had a hard time finding a good list so I created one using Doug Tallamy’s early resources. You can download and print my list from here. Of course you’ll want to first take stock of what you might already have – for example you might already have an oak tree or a maple (or if your neighbor has those, you can usually consider them close enough to count). If so, plant for maximum diversity by choosing something new like a river birch, a willow, or a hawthorn.

If you have very little space, you might consider choosing keystone herbaceous plants (these are your perennials, see the back side of my handout for them). Homegrown National Park has some nice resources for using keystone plants in containers; here is a link to the Southeastern one. You’ll notice them using the keystone plants goldenrod, asters, and sunflowers – those are the top 3 keystone perennials. I've included links to earlier blogs about those 3 plants so you can see some of the choices available.

So walk around and see what you've got and make plans for adding new ones in the fall to amp up the biodiversity in your garden and in the ecosystem.