Some people like to start their dinner with a salad of lettuce or other leafy greens. Ancient Egyptians and Romans also liked to have lettuce with their evening meal. But they served it at the end.

Some people like to have lettuce salad or other leafy green vegetables as an appetizer for dinner. The ancient Egyptians and Romans also liked to eat lettuce with their dinners, but they put it last.

There are hundreds of kinds of head and leaf lettuces. The most popular ones include head lettuces such as iceberg, Boston, bibb and romaine.

The types of head lettuce and leaf lettuce are There are hundreds of varieties, and the most common lettuces include: iceberg lettuce, Boston lettuce, bibb lettuce, and romaine lettuce.

Experts say lettuce is one of the easiest vegetables to grow in your garden. The best time to plant the seeds is during cool weather. Advisers at the University of Illinois Extension say the best planting temperature is fifteen degrees Celsius .

Lettuce is one of the easiest vegetables to grow in the garden, and cool weather is the best time to sow it, experts say. Gardening consultants from the University of Illinois Extension say the optimal temperature for planting seeds is 15 degrees Celsius.

Lettuce seeds are small, so do not place them too deep in the ground. If you plant some seeds every week or two, you will have harvests ready to eat one after another.

Lettuce seeds are small, so don't bury them too deep in the soil, and if you sow a few seeds every one to two weeks, you'll have a constant supply of lettuce.

You can use a seed tray to start the seeds indoors. The container should be deep enough to hold at least three centimeters of soil.

You can use a seed tray to start the seeds indoors. The container should be deep enough to hold at least 3cm of soil.

There should be about one centimeter of space between the soil and the top of the container. The container should have holes in the bottom so extra water can flow out.

Between the soil and the top of the container. There should be 1 cm of space at the mouth of the container and a small hole at the bottom of the container to allow excess water to drain away.

Drop the seeds over the surface and cover them lightly with soil. If the soil is not already a little wet, give it some water. But not too much -- you do not want to drown the seeds.

Spread seeds on top of soil and cover lightly with soil. If the soil is not moist enough, sprinkle some water, but not too much - don't drown the seeds.

Next, cover the seed tray with paper. Remove the paper when the seedlings have grown up far enough to touch it. You can transplant the seedlings into the garden when they are about two to three centimeters tall. Do this when the weather is not too hot and not too cold.

Then, cover the seeding tray with paper. When the seedlings grow close to touching the paper, remove the paper. When the seedlings grow to 2 to 3 cm high, they can be transplanted to the vegetable garden, but the temperature must be suitable during transplanting.

Take out as much of the soil as you can with the seedlings. Plant them in the ground in a hole that is bigger than the lettuce roots. Keep the plants watered, but not too heavily.

When transplanting seedlings, try to bring as much soil as possible, dig a hole in the ground that is larger than the root of lettuce, and plant the seedlings. Water frequently, but don't water too much.

Harvest leaf lettuces when the leaves are big enough to eat. Pull the leaves from the outside of the planting so the inside leaves will keep growing. Or, you can cut off the whole plant. Leave about two or three centimeters above the ground so the plant will re-grow. Cut off head lettuces at ground level.

Leaf lettuce can be harvested when the leaves are old enough to be eaten. Remove the outer leaves of the lettuce so that the inner leaves can continue to grow. Alternatively, you can cut the entire lettuce, leaving 2 to 3 centimeters of rhizome at ground level so that the lettuce can regrow. If it is head lettuce, cut it along the ground level.

Lettuce is best when served fresh. Store the remainder in the refrigerator in a plastic bag. It will last a few days and sometimes longer.

Fresh lettuce is best, Leftover lettuce should be stored in a plastic bag in the refrigerator, where it will keep for a few days or even longer.