Growing an oak tree from seed is a slow but satisfying method of propagation. Oak trees can be difficult to grow from cuttings. Preserving a favorite tree or family heirloom can be accomplished by collecting and germinating acorns. The process is not labor intensive, but it does take some time. A few tools and techniques will allow anyone to grow oak trees from acorns.
Harvest the acorns in early fall. Make sure they are still slightly green, with just the beginnings of brown coloration forming. Examine them closely for insects and moldy or rotten areas. Place the selected acorns in a bucket of water. Discard those that float, as these typically will not germinate.
Place the non-floating acorns in a heavy plastic, resealable bag filled with lightly dampened peat moss or sawdust. Put the bag in the refrigerator for a few months, checking periodically for mold or rot and removing questionable acorns. Plant the seeds when the roots begin to protrude from their split shells, usually in December or January.
Place the acorns in large seed flats and leave outside for the winter as an alternative to putting them in a refrigerator. Place chicken wire and/or a layer of sawdust mulch over the seed flats to help protect and insulate them.
Plant the acorns 2 to 4 inches deep in small pots of loamy, well-drained soil. Water regularly until the soil is thoroughly wet. Allow the top inch of the soil to dry out before watering again.
Plant the oak seedling in the ground in rich, well-drained soil when it reaches 1 to 2 feet tall. Water once a week, more often if the soil is very well-drained or sandy.
Place a layer of bark mulch around the tree to control weeds and retain moisture. Keep the mulch from directly touching the trunk of the tree as mulch can hold water and cause disease or rot.