Does any one have any experience withe these? I was looking to plant 4 in from of some English Boxwoods, so their mature height would need to be less. I have seen most estimates to be around 2-4 feet. That would work, but a nursery here has them and tag says 4-6 feet. I have also seen the higher estimates on a couple of other sites. Are there two types? Also how winter hardy are they? I am in 6A and they would be north facing. I have some other evergreen azaleas,* Girards Hot Shot, Irish eyes, Shapiros late show) that are rather leggy. Maybe not enough sun because there is a 25 ft Pear shading them. The Rhodies (Purple Gem0 planted close to them have no such issues. The Silver Swords would have no trees shading them, but because they will face North, no blazing mid day sun. One more thing, I have clay soil, so I can plant them high. Maybe thats the issue with the others? Thanks, because I am planting multiples, I need some input before purchasing.