in light of what I know about the current dilemma & situation, what this dream is telling you, is the following:
............"Buried" in my garden, is the garden of the various realms of consciousness, sort of like "in my father's house are many mansions", meaning, that you have "buried" within your subconscious, some things which are perhaps, cute, (like a komodo dragon), but can be lethal as well........i.e. fighting to the death.
These are all symbols then, the way the subconscious mind speaks to us, and then it's up to us to reverse symbols into what our conscious mind works with on the daily awareness level.
in the dream state (one level of consciousness then), there are dragons, as the boogey man, or shadows, or evil doers, in this case, "fighting to the death".
on the "other level", the waking one, of awarenss, there are other catalysts in life, like people, enemies, or even a stalker.
You must understand, it all lies within the self.
The Natal Chart can help you to understand as well, the "demons" that lie within all of us.
In your case, perhaps, the questions you query each day of the waking day like, "Is he a true friend?" or?
"he does not respect my boundaries".......or
"a bad temper", or "a master manipulator"......then all of these issues with a catalyst for you on the waking level, will be transferred and answered for you in the sleeping levels of consciousness.
They are "intimately connected" one to the other.
Dreams are the "Magic Mirror" to the soul.
so, in summation:
Dragons buried in the garden sounds to me like the soul, is demanding you realize and take a look
at what is "buried" beneath the immediate level of consciousness.