Posted: 25/06/2016 at 19:29
From your list, it looks as if you only have one - the Cordyline - to get correctly placed first time round. You won't want to be moving that around any more than can be helped.
Lemon Balm.......I'd be careful to keep that contained somehow......it will run like the clappers given half the chance Same with the mint.
Nicotiana will I think only do one year and then you will either re sow or with luck in mild conditions, they will regrow but they cannot be considered permanent as such.
The bulbs....well, you know your aspect and soil conditions......bigger clumps to begin with with will make more impact that one or two dotted about.
Are you particularly conscious of a colour scheme ? If so, try and get similar colours flowing from one to another.
The old way was always to plant taller stuff at the back of a border and graduate to small stuff at the front. There is no actual need to follow that regime provided you get the planting right and pleasing to the eye.
No doubt you will get lots of suggestions so hold hard and see if anything actually appeals to you. If not, I suggest you put plants where they will do well and look again next season. Most people move things at least once a year......if not more often........until they get it right