Pro: Good bugs overwinter in our leaf litter.
Con: Bad bugs do too.A number of garden plants are really susceptible to disease because they’ve been bred heavily for flowers or fruit instead of for disease resistance. Roses get all kinds of bugs and fungus, Camellias get petal blight (brown mushy flowers), Rhododendrons can get thrips, and fruit trees can get any number of insect and fungal diseases. All of these issues can overwinter in the warmth and protection of leaf litter. In addition, if you have snails and slugs in your garden, they love to lay eggs in fluffy fallen leaves, particularly in fall.
The solution?I rake up fall leaves from around anything that I have experienced pest problems with or that I know is susceptible to problems like that (Roses, Rhodies, Camellias, hybrid Fuchsias, peach and apple trees, citrus), and I take that leaf litter to my city’s compost, which I know will get hot enough to kill any diseases. For snail reduction, you can remove the litter around susceptible perennials and compost it on site, or just spread the leaves around trees and shrubs. With other areas of the garden, leave things as natural as possible to promote the overwintering of salamanders and “good” bugs , both of which eat garden pests, and the native insects that so many birds love to eat. If I need to rake in some areas, I try to compost it myself to avoid the gas, time and expense of taking leaf litter to the compost site and then bringing purchased compost back from there at a later date.
Pro: Leaves are great protection from frost.
Con: In wet climates, matted leaves can shade out sections of groundcover or lawn, and can rot sensitive perennials.In my climate, we get a ton of rain and some frost. I’ve seen maple leaves mat down over large areas of groundcover or lawn and totally shade and kill an area in a month. In addition, so many perennials can be smothered and rot from a nearly impenetrable mat of fall leaves.
The solution?Gently remove leaves that are directly on top of any plant, whether that’s lawn, groundcover, perennials, or even shrubs if you get a clump of leaves matted on them! Then shred the leaves, either in a shredder or by running on top of them with the mower a few times. Because shredding the leaves makes sure they can’t form a thick, killing mat on top of plants, you can then toss the finely shredded leaves back into your garden beds, or just compost them for next year’s use.
Pro: Leaves are one of the best types of compost available for improving your soil.
Con: Landscape fabric and wood chip mulch don’t allow the composted leaves to contribute to the soil.If you have wood chip mulch or landscape fabric in place to prevent weeds, the leaves will break down on top of the mulch or fabric and form a delicious growing medium in which new weeds will love to sprout. That makes landscape fabric in particular worse than nothing.
The solution?If you want the soil-building benefits of your fall leaves, you can rake them up and compost them, then once it’s all broken down into actual non-bulky compost, you can move your mulch aside and spread it, then move your mulch back on top for weed prevention. If you have landscape fabric, you can move the wood chips aside around the holes in the fabric where plants are, get a good grip on the edge of the fabric around those holes, and lift it up so you can tuck handfuls of compost under the fabric to feed the plants. If you do this, you’ll need to be careful to spread the compost evenly under the fabric and reach as far out under the fabric as possible so you don’t just dump soil on the base of your plants (plants don’t approve of that). It’s a bit of a pain, but slipping fresh compost under your landscape fabric can really help your plants thrive. If you want the wildlife benefits of leaving your leaves, I’ve found it’s fine to just rake them in spring and compost them then. I’ve never seen a significant buildup of compost on top of chips or landscape fabric from leaving whole leaves through one winter.
Pro: I love the benefits of leaves.
Con: I hate how messy they look!Our personal aesthetics vary so much. The contrast between our garden and a neighbor’s, more crisp lines of architecture vs. the softer style of a country home, and the style of planting we do in our gardens all have an impact on whether or not fallen leaves fit in with our garden’s style.
The solution?If fallen leaves currently look out of place, you can help your garden and your own eye evolve to make them a better fit, or you can just do what you can to reap the benefits from them without having an impact on how things look. If you want to go the design route and help your garden be a place where you don’t notice fallen leaves, there are a few things you can do:
- Plant year-round, evergreen plants in the foreground of your garden beds so that fallen leaves towards the back aren’t so visible.
- Plant in larger groups so that the overwintering plants make a bolder, more intentional design statement. If your eye is drawn by a stand of red-stemmed Dogwoods or a drift of Hellebores, you’ll be less likely to see the drifts of leaves as a messy element and more likely to see the poetry in the way they fall.
- Draw the eye upward with hanging bird feeders, structural or sculpture elements, and taller planting elements that bloom in winter, like the evergreen Darwin’s Barberry (Berberis darwinii) shrub, a Hardenbergia vine with purple or white flowers, Silk Tassel or Garrya elliptica with its hanging white tassels, or a Coral Bark Japanese Maple for tall stem interest.
- Spend more time in nature and notice how the palette of browns and greens in winter has a relaxed sense of calm. Visit natural gardens and start to intentionally find the beauty in a garden left naturally.
- Rake up leaves from high-traffic areas and places that you can see easily; leave any leaves you can’t really see and let them compost naturally where they fall.
- Try to avoid the gasoline-intensive cycle of using a blower or vacuum to pick up leaves, setting them out for the city to take, then going to purchase finished compost from them later on. Instead, rake by hand, compost on site, and re-use your compost in your garden in spring.
- If you won’t be growing winter vegetables, you can layer leaves on your vegetable beds to hold down weeds all winter while supporting native bugs and improving your soil. In spring, the leaves will be mostly composted and you should be able to plant.
- Plant a few natives in your garden to help support wildlife in other ways. Peter Haggard has some tips on the best wildlife-supporting native plants for coastal Northern California.