The Pollinator Gardener: Spring Clean

April 25, 2022


The Pollinator Gardener is a recurring feature in Field Notes. 

The following is a partial reprint from the

Pollinator Garden Spring Clean-up 

Okay, now that spring has arrived, you can finally clean up the garden — sort of.

In the past, I used to remove all the leaves, cut back perennial stems to the ground, and put it all into leaf bags destined for the curb. Then, I would spread mulch to make it look tidy. It turns out that this typical approach to spring garden cleaning is bad for pollinators and birds. It’s also a lot of unnecessary work.

Now, I continue to leave the leaves in the garden, cut stems to 15 inches from the ground, and chop up the rest and to decompose over the summer. I no longer need to buy and spread mulch because the plant material I left in the garden becomes the mulch. Here’s more detail on how I clean up my gardens in spring.

As soon as I can work outside, I do remove the leaves and I cut down stems (to 15 inches) only at the edges of garden beds that can be viewed from the sidewalk, and from paths. I clear as far as I can reach without stepping into the garden to avoid compacting the soil while it is still very wet from melting snow. I also move or remove the leaves to reveal early-emerging Crocuses and Bloodroot shoots.

I don’t want neighbours to think I’m neglecting our yard, especially since I didn’t tidy up in the fall like they did. An advantage of leaving stems a foot or so tall is that they help keep leaves in place in my garden, instead of blowing away into my neighbours’ newly-raked lawns.

Periodically throughout April, I poke around in sunny areas to see if plants are starting to come up. The Oak leaves that blow into the front garden in the fall form thick mats. If plants are coming up, I remove some of the Oak leaves so they don’t smother the plants popping up underneath. The Maple, Basswood, and Birch leaves in the backyard are much lighter and break down quickly, so they don’t threaten to smother plants like Oak leaves.

Using the wheelbarrow, I move the leaves and old plant material to the backyard. I toss it around shrubs in the hedgerow or in the compost pile. I no longer put anything into leaf bags, another way I now save money and labour.

Wait for warmer weather
According to Savvy Gardening’s Spring garden clean up done RIGHT, we should wait until the daytime temperature warms to a consistent 10°C (or 50°F). (I assume this means daytime high temperatures.) Insects that have been overwintering in the garden will have had a chance to wake up and leave their winter sheltering spots. The Xerces Society provides additional guidance for figuring out when it’s safe to start in their article Don’t Spring into Garden Cleanup Too Soon!

A blog post by Douglas Tallamy, Leaf Litter: Love It and Leave It (March 30, 2021), revisits the topic of spring garden clean-up. Tallamy explains that insects don’t all emerge at the same time; some continue to develop within the shelter of fallen leaves throughout the spring and summer. He recommends that we leave the leaves permanently — which is what I do now.

Leave the leaves
Continue to leave the leaves on the ground (that you already left in place in fall and winter) instead of stuffing them into leaf bags; they will decompose to become a free mulch substitute. For a tidier look, remove leaves near garden edges and start a leaf mulch pile elsewhere in your yard. You could also focus on leaving leaves just in shady areas where you’re trying to mimic humus-rich, woodland conditions.

Leave stems 15-inches above ground
Typically, when we clean up our gardens, perennials are cut back to ground level. Instead, cut pithy or hollow plant stems to 15 inches, so they can be used as cavity nests by solitary bees, like Mason Bees and Small Carpenter Bees. Some stems that are used for nests include Joe Pye Weed, Cup Plant, sunflowers, goldenrods, coneflowers, Swamp Milkweed, bee balms, raspberries, elderberries, roses, and sumac. In my garden, I have seen Small Carpenter bees use stems of Anise Hyssop, Ironweed, and Purple Coneflowers.

New plant growth will soon cover the awkward stems that remain.

Less work, more time for bee-watching
With the time I save cleaning up the garden, I now spend it watching spring’s first bees and butterflies.

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