'Harden Off' Plants Before Placing Them Outside
2023-05-22
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1The month of May is the best planting time in many areas in the northern half of the world.
2Many gardeners are visiting garden centers now to buy plants.
3Those who have grown plants from seeds indoors may be getting ready to plant them in the garden at about this time.
4However, seedlings cannot usually go straight from an indoor growing area to outdoor beds and borders without risk.
5They need to be "hardened off" first.
6That means slowly introducing the plants to environmental conditions like sunlight, wind, and changes in temperature that they have not yet experienced.
7If plants are not hardened off enough, they could get burned by the sun or go into shock from more wind exposure or lower temperatures than they are used to. Stressed plants can recover.
8But the process usually sets their growth back by a few weeks.
9Start hardening your plants by placing them outdoors in a sheltered area that is partly protected from the sun.
10Do this for increasing periods each day for about a week before planting them in the garden.
11Protection from the sun is important.
12Even the window that gets the most sun in your home or an electric growing light cannot compete with the strength of direct sunlight.
13Choose a day after the danger of frost has passed and when the temperature is above seven degrees Celsius.
14Place plants outside for an hour, set a timer, and then bring them back inside to a warm spot, under electric plant lights is the best choice.
15Repeat this on the second day for two hours.
16Add an hour of outdoor time each day for a week.
17After that, they can safely be planted in their permanent homes, whether in the ground, a raised bed, or a container.
18Follow the weather and keep an eye on conditions throughout the process.
19Bring plants inside if rain or severe wind threatens during their outdoor time.
20Do not be concerned if there is no protection from the sun in your garden.
21You can harden your plants under an outdoor table, for example.
22Under large outdoor plants works equally as well.
23If you have none of those, you can protect your plants from the sun with something like an umbrella.
24If the weather is not hot, you can even plant your seedlings directly in the ground.
25Then harden them by covering each individually with a large plastic container with its bottom and top removed.
26Burying the bottom in a few centimeters of soil will hold the container in place.
27You can water plants through the pouring hole at the top.
28Remove the container for each day's hardening-off period.
29And then set it back into place and secure it into the soil afterward.
30Watch your plants carefully because high temperatures and strong, direct sunlight might "cook" them.
31Follow weather conditions and use your best judgement before planting seedlings directly in the garden.
32If you started plants in a greenhouse, they have already been growing in direct sunlight, so the process is easier.
33Open the windows for a few hours each day for about a week.
34Then, move seedlings to a sheltered outdoor area for two hours the first day and four hours the second day.
35After that, they should be ready to be planted outdoors.
36I'm Gregory Stachel
1The month of May is the best planting time in many areas in the northern half of the world. 2Many gardeners are visiting garden centers now to buy plants. Those who have grown plants from seeds indoors may be getting ready to plant them in the garden at about this time. 3However, seedlings cannot usually go straight from an indoor growing area to outdoor beds and borders without risk. They need to be "hardened off" first. 4That means slowly introducing the plants to environmental conditions like sunlight, wind, and changes in temperature that they have not yet experienced. If plants are not hardened off enough, they could get burned by the sun or go into shock from more wind exposure or lower temperatures than they are used to. Stressed plants can recover. But the process usually sets their growth back by a few weeks. 5Hardening indoor plants 6Start hardening your plants by placing them outdoors in a sheltered area that is partly protected from the sun. Do this for increasing periods each day for about a week before planting them in the garden. Protection from the sun is important. Even the window that gets the most sun in your home or an electric growing light cannot compete with the strength of direct sunlight. 7Choose a day after the danger of frost has passed and when the temperature is above seven degrees Celsius. Place plants outside for an hour, set a timer, and then bring them back inside to a warm spot, under electric plant lights is the best choice. 8Repeat this on the second day for two hours. Add an hour of outdoor time each day for a week. After that, they can safely be planted in their permanent homes, whether in the ground, a raised bed, or a container. 9Follow the weather and keep an eye on conditions throughout the process. Bring plants inside if rain or severe wind threatens during their outdoor time. 10Do not be concerned if there is no protection from the sun in your garden. You can harden your plants under an outdoor table, for example. Under large outdoor plants works equally as well. If you have none of those, you can protect your plants from the sun with something like an umbrella. 11If the weather is not hot, you can even plant your seedlings directly in the ground. Then harden them by covering each individually with a large plastic container with its bottom and top removed. Burying the bottom in a few centimeters of soil will hold the container in place. You can water plants through the pouring hole at the top. 12Remove the container for each day's hardening-off period. And then set it back into place and secure it into the soil afterward. Watch your plants carefully because high temperatures and strong, direct sunlight might "cook" them. Follow weather conditions and use your best judgement before planting seedlings directly in the garden. 13If you started plants in a greenhouse, they have already been growing in direct sunlight, so the process is easier. Open the windows for a few hours each day for about a week. Then, move seedlings to a sheltered outdoor area for two hours the first day and four hours the second day. After that, they should be ready to be planted outdoors. 14I'm Gregory Stachel 15Jessica Damiano reported this story for The Associated Press. Gregory Stachel adapted it for VOA Learning English. 16____________________________________________________________________ 17Words in This Story 18garden - n. an area of ground where plants (such as flowers or vegetables) are grown 19seedling -n. a young plant recently grown from a seed 20exposure - n. the fact or condition of being affected by something or experiencing something 21frost - n. the occurrence of weather that is cold enough to cause water to freeze and frost to form 22umbrella - n. a device that is used for protection from the rain and sun 23greenhouse - n. a building or part of a building that has glass walls and a glass roof and that is used for growing plants 24___________________________________________________________________ 25What do you think of this story? 26We want to hear from you. We have a new comment system. Here is how it works: 27Each time you return to comment on the Learning English site, you can use your account and see your comments and replies to them. Our comment policy is here.