I have a 4 to 5 year old Little Cado/Wurtz avocado tree and it has never flowered. It's growing great and looks very healthy. I thought it was both an A/B type that didn't need a mate. But also, our neighbor has a huge Haas tree so it does have that. I read that it should take no more than 2 years to get fruit from this variety. Any thoughts how I can promote fruiting?