Fall fertilizing is mostly about restraint. Most plants are slowing down as days shorten and temperatures drop, and feeding them as if it were still summer pushes soft, leafy growth that has no time to harden before frost. That soft growth is the first thing frost damages, and the damage can spread into the plant and weaken it for the whole of next year. So the first rule of fall fertilizing is: feed less, feed gently, and for most plants, stop feeding altogether. The second rule is that fall is still a useful time to feed the soil, which is a different thing from feeding the plant, and the distinction matters.
That does not mean nothing gets fed in fall. Lawns, newly planted trees and shrubs, and some cool-season vegetables can still benefit from a light, well-timed feed, and organic soil improvers such as compost work slowly through fall and winter without forcing growth. This guide explains what to feed, what to skip, which products suit fall, and how to use the season to build soil fertility for spring instead of chasing growth now. If you are unsure about feeding a particular plant, check your local extension service, which can advise on soils and fertilisers for your area.
Why fall feeding is different
In spring and summer, plants are in active growth and can use nitrogen quickly, turning it into leaves and stems. In fall, growth slows, daylight shortens, and soil temperatures drop, so plants take up far less nitrogen and what they do take up goes into soft growth that frost kills. Excess fertiliser that plants cannot use does not just sit harmlessly in the soil: nitrogen can wash away in fall and winter rain, ending up in waterways, and salts from synthetic fertilisers can build up around roots and damage them. A heavy fall feed is therefore wasteful, harmful to water, and bad for the plants themselves.
What plants do need in fall is a chance to harden off. As temperatures drop, plants move sugars and nutrients into their roots, thicken cell walls, and prepare for dormancy. Phosphorus and potassium support root development and hardiness, which is why some gardeners use a low-nitrogen, higher-potassium feed in early fall for lawns and established plants. But even that should be applied early in the season, while plants are still active enough to take it up, not late in fall when growth has stopped. Our fall lawn care guide covers lawn feeding in detail, and fertilizing vegetables explains feeding through the growing season.
What to feed in fall — and what to skip
Lawns are the main exception to the no-feeding rule. A light fall feed helps grass roots grow strong through fall and winter, so the lawn greens up earlier and thicker in spring. Apply it early in fall, while the grass is still growing, and use a product suited to fall lawns rather than a high-nitrogen summer feed. Cool-season vegetables sown for fall harvest, such as lettuce, spinach and kale, can take a light feed while they are actively growing, but stop once growth slows and frosts begin. Newly planted trees and shrubs generally do not need fertiliser at planting: compost worked into the planting hole is enough, and a strong feed can burn new roots.
Skip feeding most other plants in fall. Roses should not be fed after late summer, since feeding encourages soft stems that frost damages — see growing roses for the rose calendar. Fruit trees should not be fed in fall, because a late flush of growth is vulnerable to frost and can reduce next year's fruit. Perennials, shrubs and evergreens need nothing, and houseplants brought indoors for winter should not be fed at all until spring — see our fall houseplant care and fertilizing houseplants guides. Annuals that are finishing can simply be composted, not fed.
Organic options for fall
Organic feeds and soil improvers suit fall far better than fast-acting synthetic fertilisers, because they release nutrients slowly as soil organisms break them down, and they improve the soil itself. Compost is the best fall soil feed there is: spread a layer over beds and let worms pull it down through winter, or work it into beds being planted. Our composting basics guide explains how to make it, and compost tea covers a liquid option for plants still growing. Well-rotted manure can be spread on empty beds in fall so it breaks down over winter, but never use fresh manure on beds, since it can burn plants and carry pathogens, and never use it on food beds close to harvest.
Bone meal is a slow-release source of phosphorus that suits fall planting of bulbs and shrubs, since it supports root growth without pushing leafy growth. Our bone meal fertilizer guide explains how to use it. Blood meal is high in nitrogen and fast-acting, so it is a poor choice for fall — see our blood meal fertilizer guide and save it for spring. Fish emulsion is a gentle liquid feed that can help fall vegetables while they are still growing, covered in our fish emulsion fertilizer guide. Wood ash contains potassium and raises soil pH, so use it sparingly and only if your soil is acidic, and never mix it with manure or nitrogen fertiliser.
How to apply fall fertiliser safely
If you do feed in fall, apply it early, while plants are still actively growing and soil is still warm enough for uptake. Water the soil before and after applying granular fertiliser, so it dissolves and reaches the roots rather than sitting on dry soil, and never apply fertiliser to dry or stressed plants. Scatter granular feed evenly rather than piling it against stems, and keep it off leaves, since fertiliser on foliage can scorch it. Follow the rate on the packet rather than guessing: more fertiliser is not better, and overfeeding is a common cause of plant damage. Wear gloves, wash your hands after handling fertiliser, and store products dry and out of reach of children and pets.
For liquid feeds, dilute exactly as directed and apply to damp soil, not to dry soil in hot sun. For compost and manure, spread a layer a few inches thick over empty beds and leave it on the surface over winter, letting worms and weather work it in. Do not dig heavy manure into beds in fall if the soil is wet, since digging wet soil damages its structure — see our fall soil preparation guide for the right approach. And do not fertilise before heavy rain is forecast, since rain washes nutrients away before plants can use them.
Building soil fertility for spring
The smartest fall fertilizing is often not fertilizing at all, but building soil fertility for spring. Sowing a cover crop such as clover or winter rye on empty beds fixes nitrogen, protects the soil from erosion, and adds organic matter when it is dug in during spring. Our cover crops for soil and green manure guides explain which cover crops suit which beds. Spreading compost, leaf mould or well-rotted manure on empty beds over winter does the same job more slowly, feeding soil life through the cold months so the soil is rich and alive when spring planting begins.
Leaf mould deserves a special mention: fallen leaves collected in fall, piled in a corner or in bags with holes, rot down over a year or two into a dark, crumbly material that is excellent for improving soil and mulching. Our leaf mulch guide covers leaves in the garden, and our fall composting guide explains how to handle the autumn glut of leaves and garden waste. Testing your soil in fall is also worthwhile, since a test tells you what the soil actually needs rather than what you guess it needs, and any lime or mineral amendment applied in fall has months to work before spring. See our soil pH testing guide for how to test.
Common fall fertilizing mistakes
The most common mistake is feeding too late, after plants have stopped growing, so the fertiliser sits unused or washes away. The second is using a high-nitrogen summer feed in fall, which forces soft growth that frost kills. The third is feeding roses, fruit trees and tender shrubs in fall, which weakens them for winter. The fourth is applying fresh manure, which burns roots and can carry disease. The fifth is guessing the rate rather than following the packet, which risks salt damage around roots. The sixth is fertilising dry soil, which concentrates salts around roots, and the seventh is forgetting that compost and soil improvers count as feeding too — a bed that received a thick layer of compost in fall does not need a synthetic feed as well. When in doubt, feed less and check your local extension service for advice on your soil type.
Frequently asked questions
Should I fertilize in fall?
Lightly and selectively. Lawns and actively growing fall vegetables can take a light early-fall feed, and compost or well-rotted manure can go on empty beds. Most trees, shrubs, roses, fruit and houseplants should not be fed in fall.
What fertilizer is best for fall?
A low-nitrogen feed, or better, an organic soil improver such as compost, well-rotted manure or bone meal. Avoid high-nitrogen summer feeds and fast-acting products late in the season, since they push soft growth that frost damages.
When should I stop fertilizing in fall?
Stop feeding most plants by early fall, while they are still active enough to use what you apply. Lawns can be fed early in fall, but feeding after growth has stopped is wasted. Houseplants should not be fed from fall until spring.
Can I put compost on beds in fall?
Yes, compost is ideal for fall. Spread it over empty beds and let worms pull it down over winter, or work it into beds being planted. See our composting basics guide for how to make good compost.
Is fall a good time to test soil?
Yes. A fall soil test tells you what the soil needs, and amendments such as lime applied in fall have months to work before spring planting. See our soil pH testing guide.