Autumn leaves in the garden: 4 mistakes and what your beds need instead
Fallen leaves aren't waste – they're mulch, compost and winter shelter in one. These four fixes help you use them well, kids included.
October is leaf season, and a lot of people bag it all up for the green bin. But those leaves hold part of the nutrients the tree took up over summer. Here are four common mistakes and how to do better.
Mistake 1: Clearing away every leaf
A bed left bare over winter loses humus and soil life. A loose layer of leaves, roughly 5 to 10 centimetres (2 to 4 inches) deep, protects the soil from heavy rain and frost, and earthworms pull most of it down by spring. Maple, linden, fruit tree and birch leaves work especially well.
On beds with winter crops like lamb’s lettuce or winter spinach, keep the plants clear or scatter leaves only thinly between them – thick, wet layers invite rot and slugs there.
Mistake 2: Throwing every leaf into one pile
Leaves from oak, walnut, plane tree or poplar break down slowly because they contain a lot of tannin or are tough and leathery. Walnut leaves also contain juglone, which can hold back sensitive plants. That’s no reason to bin them, but they don’t belong as mulch straight on your vegetable beds. Collect them separately in a wire cage, where they turn into fine leaf mould in one to two years.
The nice part: a simple cage of chicken wire and four stakes takes half an hour to build. Kids love stomping the leaves down, which saves you the compacting.
Mistake 3: Spreading diseased leaves on your beds
Leaves with apple scab, rose rust or black spot can carry fungal spores through winter. Pick out visibly infected leaves and put them in the municipal green waste bin or into a hot, well-mixed compost – not back as mulch under the same plants.
Healthy leaves are nothing to worry about. When in doubt: leaves that are evenly coloured, without spots or coatings, can stay.
Mistake 4: Tidying the leaf pile
Hedgehogs, beetles, bumblebee queens and toads look for hiding places in late autumn. A loose heap under a hedge or along a fence, with branches as a frame, makes an ideal winter shelter. Leave it alone over winter if you can, and skip leaf vacuums and blowers, which also suck up small animals.
A nice family project: build a hedgehog shelter from branches and leaves together. Watch it from a distance and don’t disturb it if someone moves in.
Your leaf plan for this weekend
Start by raking the lawn, since leaves smother grass there. Then sort the leaves: maple, linden and fruit tree leaves onto beds or under shrubs, oak and walnut into the wire cage, diseased leaves out, and one pile for the wildlife. If you like, scatter a handful of horn shavings per square metre over the bed first so the soil doesn’t tie up too much nitrogen as the leaves break down.
In Rootivo’s garden journal you note where you spread leaves, so in spring you know right away which beds were already covered.