Spacing and planting of Emerald Green Arborvitae
I have inherited a 7 shrubs "Emerald Green Arborvitae" that the builder has planted (bought from Home depot). I want this to provide some privacy. A picture says more then a 1000 words so here is the current state.
Notice the trees are 55inches apart, 58 inches tall and 23inches wide at the base. The "fact sheet" from home depot states that the mature size of the tree is 8-10 feet tall and 24 inches wide.
Since they are already 23inches wide at the base but only 58inches tall and can grow to 120inches, I wonder if they can fill up the empty space? The other option is to replant them to be closer to 30inches apart, but I prefer they can grow taller and wider naturally then have a lot of small trees.
Notice that the trees that are planted by the builder are showing quiet a bit of the root ball, which concerns me a lot. The trees that I (re) planted are quiet a lot deeper in the soil. Here is a picture of the exposed root ball:
Also, there is no mulch on any of them.
So the questions:
Do I need to replant them to be closer in spacing?
Do I need to add mulch?
Do I need to replant the trees that are showing the rootball.
This is in NJ, the soil is rocky with clay.