the Garden of Growth Without Life

Where is this? It makes little sense to ask where the Garden of Growth Without Life is, much like many places in the far realm. This little pocket of almost reality is located in the Proxima of the chaos seas, and it is unclear if the Garden of Growth Without Life is a places or a thing. Growth without Life is a known Old One, it's notable creations are things which appear as if they are alive while being entirely not living. This garden is an epitome of this. The garden seems filled with fungal growths each strange and dynamic, but still none of it is alive in any sense of the word. It even has 'beasts' which wander the garden but even these aren't alive.
Why would your players want to travel here? Only fools and madmen would want to travel to the garden, for only death and madness lies there. Yet if one is powerful enough it is possible to warp the garden with their mind, allowing the traveler to create works of such impossibility that it would be impossible to render them anywhere else. It is not necessary to travel there in the flesh though. Some walk the gardens in their dreams, and gain such gifts of the mind which grant powers unknown to others.
What difficulties do they face getting here? Travel to anywhere in the far realm is unsure and unsafe. Trying to travel to the garden in the flesh requires passage through a portal, very few of these are found in the world. The only known portals in the world are found in the Underdark, in a mushroom forest of the Growth Without Life's design. The forest's very air is poisonous causing different effects completely at random. To travel there in a dream is also perilous, the easiest way to do so is to consume potent poisons formed from unliving fungi. Those who posses boons from the Growth Without Life can also undergo such a pilgrimage.
https://dungeonmasterblock.freeforums.net/thread/1642/dm-nastics-87-journey-destination