Sky Pencil Holly; how fast do they grow?
I have done a ton of research for a shrub/tree that will stay very narrow (2 feet max) and get at least 8' tall in full sun AND be evergreen. The plant I keep coming back to is Sky Pencil Holly. I want to make a hedge of them for privacy in my front yard (see picture below). I would like to know if anyone has had experience with them and can give me an idea of how fast they grow (inches/year) and what (if anything) I can do to make them grow faster (lots of water, fertilizer?). Are they a 'thirsty' plant? I live in a very dry climate, so I need to know how much water they need as I will have to provide it.
Also...I am going to need a lot of individual plants for this hedge; probably 18-20 spaced 2.5 feet apart. Does anyone have an online nursery to recommend with good prices, or should I just scope out my local nurseries when they open? I am trying to decide if I should splurge and buy bigger plants, or save some money and buy small if they are going to grow fairly fast.
Thanks for the advice in advance!