How far apart should one plant their plants from each other for various types? (stem, rosette,rhizome). I think I'm wasting room but I dont want to crowd them prevent some from adequate lighting. Is there a good rule of thumb?
Don't think there are any rules of thumb in this case. Really depends on the effect you want to achieve and the particular characteristics of the plant while allowing for room for growth. Also need to consider the lighting and if it has enough "omph" to penetrate a densely planted stand.