I haven't tried to grow russian olive (oleaster,
Elaeagnus angustifolia) from seed, but I have successfully grown it from cuttings.
Propagating by cuttings was dead easy, and almost 100% success rate. In early spring before the leaves start to come out on the russian olives, Cut some branches that are anywhere from one to 4 inches in diameter. I like to "crown lift" the russian olives here because otherwise they get too bushy at the bottom and block the walking paths and canals, so the cuttings are a by-product of normal spring pruning. Cut off the tops and side twigs, to make sticks about 3 to 5 feet long, with no branches or maybe a single fork. Keep track of which end is up. Stand them in a
bucket of
water if you haven't already prepared the holes to plant them in. Dig holes 1.5 to 2 feet deep (because in our climate the top foot of soil can dry out completely, so deeper is better, and also reduces wiggling due to wind or impact). Do not improve the soil in the holes. Stick the cuttings in the holes, and put a cutting in each. Pack the removed soil back into the hole, packing it tightly by pounding with a stick and stomping with your feet so the cutting is tightly in there. Water it the same day, and frequently for the first half of the summer, and then when the plants have leafed out and seem strongly rooted, cut back on watering. This is the same method as for willows and poplars.