First let me mention, that if you're thinking to use of 3ds Max's Containers / XRefs together, take in mind, that XRef objects aren't supported by that feature (Containers doesn't allow you to Add XRefs to its content).
"Is there possibility that I have in master scene container with plants sources and then all separate xref files use that container for source of plants?"
Yes, that's possible and upon our internal tests all works as supposed.
"If I organize master scene in xrefs, I have doubling of same sources of plants from different xrefs."
Would you mind to share more details regarding this issue? Thanks in advance.
Most common work-flow is "direct" using XRefs as the Library Browser
lets you to create your own libraries / presets (which you can share among all) and when placing you can take advantage of the XRef to library
option. I would suggest you to check our "Creating Libraries
" tutorial covering that topic in detail.