You can collect acorns from the same tree, at the same time, and you will get lots of genetic variation. I have bought liveoaks from a grower who collects his acorns from one tree and it is incredible how much variation there will be. These trees are being grown in rows and under the same conditions. Keep in mind that only 1/2 of the dna is coming from the mother tree. The other 1/2 comes from the pollen and each acorn can be from different sources of pollen. I have about 50 "Cathedral " oaks that are a cloned (actually started from cuttings) variety so they are genetically the same. The company is in Florida. There is a registered nursery/dealer near Palestine.