First, you would have much the same slight possibility of growing olive trees for fruit in your climate as I would in mine...they would be more likely to produce a harvestable crop if container grown and moved to an unheated greenhouse over winter, given some protection from Spring frosts. Olive needs a long, hot growing season to ripen fruit, no late spring frosts to kill the blossoms and adequate winter chill to insure fruit set.

None of the cultivated edible varieties can be propagated by seed. Seed propagated trees revert to the original small-fruited wild variety. From seed, you might have a tree of ornamental value but with fruit you would not eat.

Sow in moist seed sowing mix and cover with a 3mm layer of sowing mix or vermiculite. Keep at a temperature of around 18-21C (65-70F). After sowing, do not exclude light as this helps germination. Keep the surface of the sowing mix moist but not soggy; Germination will take anywhere from 1-10 months.