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Your pepper plants may not survive if you move them from the protected inside to harsh, all-day sunlight. Spend a couple more weeks setting them outside in indirect sunlight for brief periods during the day.  It may be best to choose hours in the morning or late afternoon, rather than during the hottest hours. Over the course of the 2 weeks, leave them out for a little bit longer each day. On the last day you do this, leave the plant out for about 8 hours. Avoid leaving young peppers out overnight until they are fully hardened off after a few weeks of increasing the time they spend outside. This is not really an exact amount, but not every plant or garden is the same. If you make the hole about the size of three good shovelfuls, you’ll have room to add some sand and compost, as well as put the plant in. Dig 1 hole at a time and follow the next steps. Then you can judge if the hole was big enough for your plant or if you need to make the following ones bigger. Since peppers started out in tropical climates, they thrive in sandy soil. Put 1 shovelful of sand into the hole, followed by 1 shovelful of compost or manure. Level the sand and compost out and pack them down just a bit. After the sand and compost are in the hole, gently pull the pepper plant from the pot. Place it into the hole carefully so that it stands up straight. Ideally, the top of the soil that’s attached to the plant should be about 1 inch (2.5 cm) below the top of the hole. Use the extra dirt from when you dug the holes to fill in around the plants. Pack the soil down nice and tight so it is pressed against the roots and soil that was on the roots. As the pepper plants continue to grow, they will spread their leaves out. Because of this, it’s important to plant them far enough apart for them to expand. Each row needs to be far enough from the one next to it so the plants can expand on both sides and give you room to walk through. You’ll want about 1 foot (0.30 m) of walking room between the rows, so be sure to leave enough room.  It’s better to put them farther apart rather than too close. Check recommendations for the specific variety of pepper that you are planting. Some benefit from closer spacing. Soak the soil all around the plants so the soil from the plants combines with what you added around the roots. There’s a danger of overwatering, so pay attention that the ground doesn’t become soggy. Transfer the soil moisture meter to your garden.

Summary:
Place the plants outside in indirect sunlight for a few hours a day. Dig a hole for each plant that’s about 3 shovelfuls deep. Pour some sand and compost or manure in the planting hole. Set the plant into the hole. Fill the hole around the plant’s roots. Bury the pepper plants 18 to 24 in (46 to 61 cm) apart in the same row. Make the rows 24 to 36 inches (61 to 91 cm) apart. Give the plants a thorough watering.