You need to plant a minimum of 3' away from the wall of the house. 3' wide nandina + 5' wide hydrangea = 8' feet of space. There is no room for 4' of lorepetalum and not really enough for nandina + hydrangea.

If you want a shrub to be 3' or 4' wide ... that's only one plant.

The "odd numbers rule" is immaterial when the above-ground portion of the finished product will grow together as a single mass. And there are other cases -- such as 'bookending' -- where it doesn't apply.

Amy it has been three years since this post. Could you please let me know how big did your White Wedding hydrangeas get? I love the ones I bought this year but I am wondering if they come close to being 6 feet tall or 3-4 feet? Thank you in advance for your help.

@dianela7analabama I have White Wedding in a large container and it reached to about 3.5 feet tall, about 3 feet wide.

@westes Zone 9b California SF Bay

Thank you Westes for your reply. Maybe if it is able to get to 3.5 feet in a pot It can get to 6 in the ground? I am surprised I can’t find much on this one here or in YouTube after how well it has performed here on its first season.

Hard to say but potting does tend to keep the size in check somewhat.