Blue Princess Holly Hedge
We are creating a privacy hedge. We'd like to use Blue Princess Holly. We're trying to determine if it will meet our needs.
We'd eventually like a dense, uniform height hedge, informally trimmed, 10-12ft tall. We'll start with 6' tall plants, or taller if we can find them.
Below is a picture of where we want to plant it. We will plant a few feet off the pictured fence. I am facing west in the photo, and the wind chiefly comes out of the west. You can see the plant will have partial, but not full, protection from winter winds.
I put up two flags in the picture. The lowest one (on the right) is 8ft tall, the higher one is 12ft.
The location gets full sun all year long. There is some shade in the morning, then full sun from mid-morning on.
The hedge will be 20 feet long. Each fench post in the photo is 10ft apart. We'll start the hedge at the first post on the right of the picture and go down the hill 20 feet.
We're located in Berkley, MI, zone 5b or 6a. Based on a general soil test for our lawn our soil is "Mineral, Clay loam", pH 7.6.
1. How tall might a Blue Princess get in these conditions?
2. How much do they grow each year?
3. How far apart should we plant them? I'm wondering if the horizontal growth rate is the same as the vertical, and thus how quickly it will fill-in between plants.
4. How many males (Blue Prince) would we need to keep the females pollinated? Or how many "Berri-Magic Royalty", which is a male and female in the same pot?
5. Do the males and females grow at the same rate, so could we put them both in the same hedge?
6. Would this location be protected enough from winter burn? Would using an anti-desiccant spray be sufficient protection?
Talking to a few nurseries and checking their websites I've been getting conflicting information, so any help would be appreciated!