For the window boxes: Provide drainage while keeping large pots light: Cut dollar store pool noodles and use as drainage material instead of stones. Large planters will be light enough to move later if needed.
Inspiring 45 Outdoor Bathroom Designs That You Gonna Love : 45 Inspiring Outdoor Bathroom Designs With Wooden Bathroom Wall And White Bathtub Wash Basin Closet Mirror Lamp And Ceramic Floor And Stone Ornament And Wooden Door
Maybe in a circle around the tree--leaving some space in the center for the trunk? Repurpose Broken Plates for Colorful Garden Ground Cover Check with an Arborist to see if this is good for the tree. I'd do this by the curb with a walkway light in it.
Plastic Straw as Stem Extender. "Boost a meager bouquet to new heights by inserting short flower stems into clear plastic straws to give them greater stature." From REAL SIMPLE All-Time Favorite New Uses for Old Things"