When the first warm days of spring arrive, you may feel ready to get back into the garden. Winter is over. The season has begun. Before planting anything, the soil needs attention.
There are a couple of ways to prepare a garden bed. Both have their uses. Sometimes we should till. Sometimes we should not.
Too much tilling over time can disturb soil structure and the life within it. Fungi, earthworms, insects and bacteria all have a role. Repeated digging can disrupt the soil food web and make it harder for the soil to hold together well.
At the same time, digging has its place. If soil is compacted or low in organic matter, mixing in compost and organic fertilizers can help straight away. Tilling or double digging can increase organic matter quickly when you are preparing soil for planting. Using a garden fork instead of a gas powered rototiller is a gentler option.
If the soil is already in reasonable condition, you can work amendments into the top few inches with a fork. If it is poorer or compacted, single digging may not be enough. In those cases, double digging can loosen the soil more deeply. Most gardens only need this once.
A common approach is to add a couple of inches of compost and a standard fertilizer mix. If a soil test shows the pH is off, ground limestone can be added for acidic soil and pine sawdust for alkaline soil. These are spread on the surface and worked into the soil.
Some gardeners incorporate compost and organic fertilizers based on a soil test. In new beds, several inches of compost may be mixed in at the start, then the soil is left mostly undisturbed in future years.
Soil moisture matters. Digging very wet soil can damage its structure and cause long term harm. A simple test is to squeeze a handful of soil into a ball and drop it from waist height. If it stays in a clump, it is likely too wet. If it breaks apart, it is usually ready.
When the soil is workable, clear the surface. Remove weeds or old crops. If a cover crop has been grown over winter, it can be cut at soil level and composted. It can also be dug in, but it will need a couple of weeks to break down before planting.
Another method is sheet mulching, also known as lasagna gardening. It works by building soil from the top down. Instead of removing grass and weeds, they are covered with a thick layer of cardboard or newspaper. On top of that, 12 to 18 inches of organic matter is added.
A simple version starts with cardboard or newspaper. Then add a 3 inch layer of manure or grass clippings. Then a 9 inch layer of straw or leaves. Fertilizers can be sprinkled between layers. The top layers can be lightly mixed to speed decomposition. The bed is then moistened.
Over time, these materials break down and feed the soil below. Organic matter increases. Soil biology improves. There is less need for heavy digging later.
Sheet mulching requires patience. It can take a season before planting directly into it. For new beds, especially in lawn areas, it can be a practical choice.
Healthy soil depends on structure and organic matter, but also on living organisms. Watering only at the base of plants can leave the surrounding soil dry. Microorganisms, earthworms and insects need moisture as well. When soil life is supported, plant health often improves.
Some gardeners add seaweed to compost without rinsing it. Others experiment with diluted sea water because it contains minerals and organic substances. Cover crops that combine legumes and grasses can also help. Legumes add nitrogen. Grasses contribute organic matter. Hairy vetch is often used for nitrogen capture. Cereal rye is used for the amount of growth it produces.
Microbial diversity can be increased by adding a few handfuls of soil from a different ecosystem, such as a forest or meadow, into a compost pile. Greater diversity in compost can lead to healthier soil.
In practice, many gardeners combine methods. Compost and organic fertilizers may be worked in at the beginning. A layer of mulch can be added on top. In later years, soil can be maintained with annual topdressing and mulch rather than repeated digging.
Start small. Prepare one bed at a time. Break up large clods with a fork. Shape the bed with a rake. Then it is ready for sowing or planting.
Preparing soil is not dramatic work. It is steady work. It helps plants grow stronger. It makes watering and weeding easier over time. Small improvements made each season can add up.