Fall Garden Prep: 9 Jobs That Pay Off Next Spring

There is a moment every fall when the garden tips from abundant to tired. The tomatoes split, the squash leaves go grey with mildew, and the bean vines rattle when the wind picks up. It is tempting to call the season finished and walk away until spring. But the few weekends between the last harvest and the first hard freeze are some of the most valuable gardening time of the whole year.

Work you do now has months to take effect. Compost spread in October is half-integrated by April. Lime added after a fall soil test has time to adjust the pH before planting. Garlic planted this month will be one of the first things you harvest next summer. And beds put to bed properly come back in spring ready to plant, rather than needing a weekend of clearing first.

Here are the nine jobs that give the best return, in roughly the order most gardeners tackle them.

1. Clear spent crops, but not everything

Start by pulling annual vegetables that have finished: the tomato plants, the bean vines, the cucumber and squash plants. Healthy plant material can go straight onto the compost pile, chopped up so it breaks down faster.

You do not need to strip every bed bare, though, and there are good reasons not to. Cutting healthy annual plants off at soil level, rather than pulling them, leaves the roots in the ground. They decompose over winter, feeding soil life and leaving channels that help water and air move through the soil. In ornamental beds, the hollow stems of many perennials give overwintering shelter to native bees and other beneficial insects, and seed heads feed birds through the cold months. Many gardeners now leave perennial stems standing until spring and cut them back once temperatures warm up.

A reasonable rule is to be tidy in the vegetable garden, where pests and diseases can overwinter on crop debris, and relaxed in flower borders, where standing stems do more good than harm.

2. Remove diseased plants carefully

Plants that suffered from disease this year need different treatment. Tomato leaves with early blight or late blight, squash covered in powdery mildew, and anything with bacterial wilt or clubroot can carry problems into next season if the debris stays in the garden.

Bag diseased material or send it out with municipal yard waste, where large commercial piles reach temperatures that a typical backyard heap does not. Home compost piles rarely stay hot enough, long enough, throughout the whole pile to reliably kill disease organisms, so it is safer to keep diseased plants out of them entirely.

Make a note of which beds had problems. Rotating crop families to different beds next year is one of the simplest ways to break disease cycles.

3. Test your soil now, not in spring

Fall is the best time of year for a soil test. Labs are less busy than in spring, so results come back quickly, and you have the whole winter to act on them.

Timing matters most for pH. If your soil is too acidic, the usual fix is garden lime, which reacts slowly and can take several months to change the pH meaningfully. Lime spread in fall is working by planting time. Lime spread in May may not catch up until midsummer.

Most state Cooperative Extension services offer inexpensive soil tests through their university labs. A standard test reports pH, phosphorus, potassium and often organic matter, along with recommendations for the crops you plan to grow. Take samples from several spots in each bed, about 6 inches deep, mix them in a clean bucket, and send in a cup or so of the mix.

4. Feed the soil with compost and leaves

Once beds are cleared, spread compost. An inch or so over established beds is plenty, and it can sit on the surface over winter. Worms and freeze-thaw cycles will start working it in for you. For new beds or poor soil, 2 to 3 inches mixed into the top few inches makes a bigger difference. The compost calculator turns those depths into cubic yards or bags for your bed sizes.

Fall also brings the best free soil amendment there is: leaves. Run them over with a mower to shred them, then spread them over beds or pile them in a corner to become leaf mold. Shredding matters. Whole leaves, especially large ones like maple and oak, mat into a soggy layer that sheds water. Shredded leaves stay loose, break down faster, and are much more welcome by spring.

If you have more leaves than beds, a simple wire cage or a heap in a shady corner will turn them into leaf mold in one to two years. It is low in nutrients but excellent for improving soil structure and water holding, and it makes a superb ingredient in homemade seed-starting mixes.

5. Cover bare soil for winter

Bare soil over winter is exposed soil. Rain compacts the surface and washes away fine particles, and in many areas weeds move in during mild spells. Covering beds protects the soil and often improves it. You have two good options.

Sow a cover crop

Cover crops are plants grown to protect and improve the soil rather than to eat. Cereal rye is the most forgiving fall choice for most of the US. It germinates in cool soil, grows through mild spells in winter, and holds soil in place with a dense root system. It can be sown later than most cover crops, often into mid-fall in many regions.

Other common options include crimson clover and hairy vetch, legumes that add nitrogen but need to be sown earlier to establish before cold weather, and oats, which grow quickly in fall and are killed by hard freezes in colder zones. A winter-killed oat cover is especially convenient for small gardens, because it leaves a soft mulch that is easy to plant into in spring.

Cereal rye does need a plan for spring. It grows vigorously once the weather warms and should be cut down before it sets seed, ideally a few weeks before you plant. In small raised beds, many gardeners find a winter-killed cover or a simple mulch easier to manage.

Mulch the beds

If a cover crop is more than you want to manage, cover beds with 2 to 3 inches of shredded leaves, straw or compost. It protects the surface, feeds soil life, and suppresses early weeds. Pull it aside in spring to let the soil warm before planting. The mulch calculator works out how much you need.

6. Plant garlic and spring bulbs

Fall is planting season for a handful of crops that need winter cold to perform. Garlic is the most rewarding. Cloves planted a few weeks before the ground freezes grow roots in fall, sit through winter, and grow rapidly in spring for a harvest in early to midsummer. It takes almost no work and very little space. Our guide to planting garlic in fall covers timing, spacing and varieties in detail.

The same window suits spring-flowering bulbs such as tulips, daffodils, crocus and alliums. As a general guide, plant them about two to three times as deep as the bulb is tall, pointed end up, once the soil has cooled but before it freezes. Daffodils and alliums have the advantage of being largely ignored by deer and rodents.

Fall is also the traditional time to plant many trees, shrubs and perennials. Warm soil encourages root growth while cooler air reduces stress on the leaves, giving new plantings a head start before summer heat.

7. Build next year’s beds now

If you are planning a new garden bed for next spring, fall is the easiest time to start it, because winter will do most of the work for you.

Sheet mulching, sometimes called lasagna gardening, turns lawn into a planting bed without digging. Mow the grass short, cover it with overlapping sheets of plain cardboard with the tape removed, and wet it thoroughly. Then pile on layers of organic material: shredded leaves, grass clippings, compost, straw and kitchen scraps, building up 8 to 12 inches or more. By spring, the grass underneath has died and the cardboard has largely broken down. Top the bed with a few inches of compost or soil and plant straight in.

If you are building raised beds, assembling and filling them in fall gives the soil a full winter to settle, so you can top it up before planting rather than watching it sink around your seedlings. The raised bed soil calculator includes a settling allowance, and our article on why raised bed soil sinks explains what to expect.

8. Look after tools, hoses and water

Spend an afternoon on equipment before it gets put away. It is a small job that saves money and frustration in spring.

• Clean tools. Scrape off soil, wash and dry blades, and wipe metal with a light coat of oil to prevent rust. Sharpen pruners, hoes and spades with a file or sharpening stone.
• Treat wooden handles. A rub of boiled linseed oil keeps handles from drying out and splintering.
• Drain hoses. Water left inside can freeze and split hoses and fittings. Drain them, coil them, and store them out of the sun.
• Shut off outdoor faucets. In freezing climates, close the indoor valve to outdoor spigots and open the outside tap to drain the line, unless you have frost-free faucets.
• Empty rain barrels. Drain and disconnect them before hard freezes, and reconnect the downspout so water flows away from the house.
• Bring in drip system parts. Timers, filters and pressure regulators can crack if water freezes inside them.

9. Write down what worked

This is the job most gardeners skip, and the one many wish they had done when spring arrives. Memories of the season fade fast. By March, it is hard to remember which tomato variety cracked, which bed stayed soggy, or exactly when the first frost arrived.

Take fifteen minutes now to write down:

• Which varieties performed well and which disappointed.
• What you planted too much of, and what ran out too soon.
• Pest and disease problems, and where they appeared.
• Your actual first fall frost date, which may differ from the published average.
• Which beds were sunny, shady, dry or wet as the season changed.

A simple sketch of what grew where helps plan crop rotation next year. Those notes become the most valuable planning tool you have, because they are specific to your own garden.

Protecting late crops

Not everything has to end with the first frost. Many cool-season vegetables keep producing well into late fall, and some taste better after cold weather. Kale, collards, Brussels sprouts, carrots, parsnips, leeks and spinach all handle light frosts, and several become sweeter as plants convert starches to sugars in the cold.

A layer of lightweight row cover, often called frost cloth, can add several degrees of protection on clear, cold nights and extend the harvest by weeks. Drape it over hoops so it does not rest directly on leaves, and weigh down the edges. Root crops such as carrots and beets can stay in the ground under a thick layer of straw or leaves and be dug as needed through much of the winter in milder regions.

Tender crops such as tomatoes, peppers, basil and squash will not survive a frost. Before the first freeze, pick everything worth saving. Green tomatoes that have reached full size and started to lighten in color will usually ripen indoors at room temperature.

When to do fall garden prep

Timing depends on where you live. Your average first fall frost date is the best guide. As a general pattern:

• Before the first frost: harvest tender crops, sow cover crops that need time to establish, take soil samples, and set up row cover for late crops.
• Around the first frost: clear spent annuals, deal with diseased plants, spread compost, and plant garlic and spring bulbs.
• After the ground starts to freeze: mulch perennial beds and strawberries to protect roots from freeze-thaw cycles, and put away tools and water systems.

In the warmest parts of the country, fall is not an ending at all but the start of a second growing season. Gardeners in the Deep South, Gulf Coast, Southern California and desert Southwest often plant their main crops of lettuce, broccoli, carrots and other cool-season vegetables in fall and grow them through a mild winter.

A simple fall checklist

1. Harvest tender crops before the first frost.
2. Pull spent annual vegetables, cutting healthy plants at the soil line.
3. Bag or remove diseased plant material.
4. Send off a soil test and apply lime if it recommends it.
5. Spread compost over beds.
6. Shred leaves for mulch and leaf mold.
7. Sow a cover crop or mulch bare soil.
8. Plant garlic and spring bulbs.
9. Start new beds with sheet mulching.
10. Clean, sharpen and oil tools.
11. Drain hoses, rain barrels and drip parts.
12. Write down what worked and what did not.

None of these jobs takes long on its own. Spread across a few fall weekends, they turn spring from a scramble into a head start.

Frequently asked questions