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Gardening sources differ about the next steps to take - some recommend planting seedlings directly into the ground after a few weeks of growth in a pot or cup, while others recommend gradually increasing the amount of each day that the plant is exposed to the outdoor weather before finally planting it in the ground. Still others recommend transplanting the seedling to a larger pot, allowing it to grow further, and then finally planting it in the ground. Though there is no single right way to decide when to transplant a seedling into the ground, there are qualities to look for which can inform your decision to transplant your seedling. Good candidates for transplanting:  Are about four to six inches tall (10 - 15 cm), with small leaves. Have white, healthy-looking roots. Appear to be outgrowing their container. Have shown substantial taproot growth. Are a few weeks to several months old. Putting your seedlings outside without getting them accustomed to the outdoors can kill your plant. About a week or two before planting your seeds outside, place your seedlings outdoors for a few hours. Slowly increase how long you leave the seedlings outside each day for the next week or two. Then, your seedlings will be ready to be planted outdoors. Make sure your seedlings are protected from the wind so they don't blow over. Location is everything - pick a location for your oak tree where it has room to grow and won't be a hindrance when they've grown large. When choosing the site for your oak tree, some things to consider are:  The availability of sunlight. Like all photosynthetic plants, oaks need sunlight to survive, so don't plant them in shaded areas. The location of nearby sidewalks, water lines, buried pipes, etc. You don't want to have to kill your tree if work needs to be done in your yard. The shading effect of the full-grown tree. If you would like your oak tree to eventually provide shade for your home, plant it to the west or southwest of your home to maximize the shading effect it will have in the summer, while minimizing its shade in the winter.Note - in the southern hemisphere, the tree should be to the west or northwest side of your house to get the shading effect.  Nearby vegetation. Plants compete with each other for sun, moisture, and other resources. Don't plant your young oak right next to any substantial vegetation, or it may not reach maturity. When you've picked a good spot for your tree, clear any minor vegetation in a 3-foot (.9 meter) circle away. Use a shovel to turn over the dirt in the area to a depth of about 10 inches (25 centimeters), breaking up any large clods. If the soil isn't moist, you may want to moisten the soil yourself or wait until after a rain to plant your tree. In the middle of your 3-foot (.9 meters) circle, dig a hole about a foot or two deep (61cm-91cm) and a foot (30cm) wide. The precise depth of your hole will depend on the length of your seedling's taproot - it should be roughly deep enough to accommodate it. your oak. Taproot facing down and leaves facing up, gently place your oak into the hole you've prepared. Make sure the hole is deep enough to accommodate the oak's roots. Replace the dirt around the plant, packing it in lightly. Water your seedling after planting it.  Pack soil around the oak seedling, sloping the soil away from the seedling so that water does not sit at the trunk of the tree, which can be damaging. Lay a circular ring of mulch about one foot (.3 meters) around the tree to help the soil retain moisture and discourage the growth of weeds. Make sure it does not touch the stem of the tree. To increase the chances of a successful planting, you may want to place several acorns in the same area. In this case, plant young seedling acorns directly into the ground by clearing a 2x2 foot (61 cm x 61 cm) area and placing two acorns into that space, with one or two inches (2.5 cm - 5 cm) of soil on top.
Track the plant's growth. Harden off your seedlings before you plant them outside. Choose a site for planting. Prepare the site for planting. Dig a hole. Transplant