I purchased my Mother two 'Weeping Cherry' trees this year. I've planted them out and they've actually shown a large amount of new growth. I've had new whips growing 2'+ off of them. The plants are roughly 5' tall from the ground. There are no limbs all the way up and the trunk is ~2" in diameter. All the growth is on the top and it's all coming out of the top 4". I know it was probably cut and encouraged to do this at the nursery, since many people will buy them as a container plant or as a decorative plant for a small yard.
However, she has a large yard and would like to grow this tree much larger. I know they do grow to be large and I would love something that grew to look like this:
I will add pictures of what mine currently look like soon, but my question is about how to encourage them to grow bigger. With a regular tree, they'd tend to put branches straight up and I could choose a leader to encourage it to grow. However, these all hang down. Will they just keep building up higher, will it eventually put out a leader, do I need to pick one that's close to the top and splint it up till it thickens and stays pointing up? What do I do in this situation. Thank you.
Edit: Here are the pictures I promised. Also, the back of the plant tag said it would get roughly 34-40' tall and have a 20-30' spread. I did see that it was grafted. When I say it has whips growing out, you'll see them in the pick, they don't grow straight out. It appears there were branches on the grafted section that were pruned back and the new whips are growing horizontally and down from near these joints. Because of the tag, I wasn't really worried about the height, but more about if I needed to do anything to encourage it to grow upwards, since the branches all droop. I didn't know if a leader would eventually grow upright.