How to Direct-Sow Seeds in a Garden
By The National Gardening Association, Bob Beckstrom, Karan Davis Cutler, Kathleen Fisher, Phillip Giroux, Judy Glattstein, Mike MacCaskey, Bill Marken, Charlie Nardozzi, Sally Roth, Marcia Tatroe, Lance Walheim, and Ann Whitman from Gardening All-in-One For Dummies
With direct sowing (or direct seeding), you plant garden seeds directly in the ground right where you want them to grow. Some plants grow better when direct-sown because their developing roots don't adapt well to being transplanted from a pot to the ground.
All seedlings grow roots as rapidly as they grow leaves, and some annual flowers put an awesome amount of energy into roots right off the bat. Flowers that spend their infancy developing long, brittle, carrotlike taproots are often difficult or impossible to transplant, so they’re best sown right where you plan to grow them.
Follow these guidelines to make direct-sowing a pleasant and rewarding experience:
Give special attention to plants that must be grown from direct-seeding, such as poppies and larkspur.
Plant seeds of plants that you will recognize or that have a distinctive appearance. For example, nasturtium leaves look like no other plants, and mistaking a bean or pea seedling for a weed isn’t easy.
Soak large seeds in water overnight before planting them. This step really speeds things along when you’re sowing hard seeds, such as sweet peas and morning glories. Before soaking, break the hard seed coat by scratching or nicking the coat with a file. Doing so does a great deal in helping the seed take in moisture.
Sow seeds in the right season. Some direct-seeded annuals are best planted in the fall or first thing in the spring; others do best when they’re planted in warmer soil in early summer.
Prepare the planting bed thoroughly. Take extra care to rake smoothly — lumpy soil and clods interfere with germination.
Sow seeds in a definite pattern. When you see a pattern of little sprouts in your soil, you’ll know that those growths are flowers, not weeds. Some seeds are best sown in rows, but you can scatter others.
Sow large seeds by hand directly where you want them to grow. If seeds are too small for your fingers, gently tap them out directly from the packet. Mix seeds with sand to help you broadcast them more evenly, if you like.
Pay attention to the seed-packet directions for best planting depth. For many seeds, a light layer of sifted compost is sufficient coverage. At other times, you simply press seeds into the soil with the back of a hoe.
Water gently and with care. Keep the soil damp until seeds sprout.
Cover seeds with something for a few days after you plant them. Old blankets and cardboard boxes make an excellent seed cover. The coverings keep the soil constantly moist while the seeds are germinating. Remove the covering as soon as you see the first sprout.
Weed early and often. If you have trouble weeding around small seedlings, use a table fork to gently pull out awkward little weeds.
After seedlings develop two sets of true leaves, thin out those that stand too close together. Gently pull extra seedlings without disturbing the ones you want to keep.

Gardening Glossary
annuals
Plants that complete their entire life cycle within one growing season. The plant germinates from seed, grows and blooms, and then produces seed and dies.

Gardening Glossary
biennials
A plant that take two growing seasons to complete its life cycle. It germinates and grows leaves and stems in the first year; produces flowers and fruit (seed) in the second, and then dies.

Gardening Glossary
bolt
When a plant flowers or produces seed prematurely.

Gardening Glossary
cold frame
A wooden or concrete block box in which you can grow plants or hold dormant during the cold winter months.

Gardening Glossary
cole crops
A family of vegetables, including broccoli, cabbage, cauliflower, kale, and Brussels sprouts. They thrive in cooler weather.

Gardening Glossary
complete fertilizer
Any fertilizer that contains all three of the primary nutrients, N-P-K (nitrogen, phosphorus, potassium). Phrase is based on regulations governing the fertilizer industry. Does not mean that the fertilizer literally contains everything a plant needs to thrive.

Gardening Glossary
deadheading
The practice of pinching or cutting off spent flowers

Gardening Glossary
evaporative-pad humidifier
A humidifier in which fans blow across a moisture-laden pad that sits in a reservoir of water.

Gardening Glossary
harden off
The process of acclimating plants grown indoors gradually to the brighter light and cooler temperatures of the outside world.

Gardening Glossary
hardiness
The ability of a plant to survive is called its hardiness.

Gardening Glossary
humus
A stable end product of organic-matter decomposition that's believed to increase microbial activity in soil, improve soil structure, and enhance the root development of plants.

Gardening Glossary
Bacillus thuringiensis Bt
An effective bacteria that attacks only the larvae of caterpillar family insects. It is safe to other insects, animals, and humans.

Gardening Glossary
macronutrients
Mineral nutrients that plants need in the largest quantities: nitrogen, phosphorus, potassium, calcium, magnesium, and sulfur.

Gardening Glossary
mulch
Organic or inorganic material placed over the surface of soil, usually directly over the root zone of growing plants. Used to conserve moisture, kill weed seedlings, modify soil temperature, provide attractive covering to garden beds.

Gardening Glossary
organic matter
Once-living stuff like compost, sawdust, animal manure, ground bark, grass clippings, and leaf mold (composted tree leaves). Used to enrich soil and improve soil texture.

Gardening Glossary
perennials
Any plant with a life cycle of three or more years. Herbaceous (non-woody) perennials include flowering plants and herbs, mainly. Woody perennials include trees and shrubs. Longevity depends on the plant and growing conditions.

Gardening Glossary
pH
The measure of soil's acidity. Soil with low pH means it's too acidic; soil with high pH means it's alkaline. Most plants grow best in soil with a pH value between 6.5 and 7.2. Neutral soils measure 7.

Gardening Glossary
photosynthesis
The process through which plants take nutrients from the air and from the water in the soil to produce sugars that fuels the plant's growth.

Gardening Glossary
primary nutrients
Nitrogen, phosphorous, and potassium are the three nutrients plants need in the largest quantities.

Gardening Glossary
root crops
Plants with edible underground roots such as onions, carrots, beets, potatoes, turnips. Most root crops are cold-weather crops.

Gardening Glossary
self-blanching
A type of cauliflower with leaves that naturally curl over the head and exclude light. Requires cool temperatures for leaves to curl effectively.

Gardening Glossary
sets
Small onion bulbs, about 1/2-inch wide, that were started from seed the previous year. Grow onion sets with the pointy end up.

Gardening Glossary
side-dressing
The act of adding a small amount of fertilizer around or "on the side" of plants after they're growing.

Gardening Glossary
succession planting
Planting small, 2-to-4-foot patches of plants every two weeks throughout the growing season so that you can harvest a crop over an extended period of time.

Gardening Glossary
thinning
The act of cutting the least robust seedlings in your garden to give the healthier plants more room to grow.

Gardening Glossary
vining crops
Crops that grow on vines, such as cucumbers, melons, pumpkins, and winter squash. They usually require support (staking, trellising, etc.) to keep them off the ground.