From Ground: Initially, water the sessile oak to moisten the soil. Afterwards, use a shovel or spade to dig around the outer edge of the plant's canopy to avoid damaging any major roots. Once you have created sufficient clearance around the tree, begin digging beneath the tree, being careful to preserve as much of the root ball as possible. When you can move the tree without resistance due to roots, gently lift it from the ground and place it on a tarp or in a wheelbarrow for transportation.
From Pot: Begin by
watering the sessile oak to make removal easier. Place your hand on the surface of the soil, with the trunk between your fingers, then gently turn the pot upside down to slide the plant out. Be careful to support the root ball and avoid damaging the trunk or branches.
From Seedling Tray: Water the seedlings first to ease removal. Gently loosen the soil around the base of the plant using a small tool like a spoon or a popsicle stick, taking care not to damage the roots. Lift each seedling out one by one, holding them by the leaves rather than the stem or root.