Like Sociable, I've had to adopt a system where I whip out all of the high-value stuff in storage and dump it in the garden at the beginning of each chapter, then remove it once all of the scenes are unlocked. Takes about 10 minutes, start to finish.
Luckily, what with crystal scenes coming rather regularly, I haven't had to do it every week for awhile now. More like every 2.
On ordinary days, my garden looks just like I want it, with wide expanses of green or paths, and courtyards, and all of the decorations that I like. The green, the paths, and the decorations can be zipped into inventory and leave room for the 2x2 and 3x3 buildings I hate, but which have high value.
And yes, I've had to get rid of some of my old stuff. About half of my Egypt items are gone, because even when I arrange the garden the way I want, it looks too cluttered with all of the sarcophagi, etc. I try to just store things, but if months go by and I haven't used them, I exchange them for white prints or silver.
That's the way it is, with GOT, since Playdom doesn't care about this issue.