Garden remove-and-replace list

[gs_silva]

This is long-term and will be added to later.

Remove ----------- Replace with

burning bush ---------- tbd
ajuga ------------------- wild strawberry
mullein ---------------- nothing
buckthorn ------------- milkweed
bittersweet ----------- blackberry
periwinkle ------------- tbd
lily of the valley ------- domestic strawberry
pachysandra ----------- turtlehead
forsythia --------------- spicebush
boxwood ----------------- tbd
Japanese quince----------- tbd