Clemmy, I cannot think of any single one book demonstrating this process but I do know from my own research that the information is to be found in several ares.

I drew my own garden hardscape on graph papers. But when in came to drawing seasonal plantings, I overlayed tracing papers on it. Each sheet represented spring,summer and fall. However since I'm terrible at drawing specific plants, I only used symbols representing the kinds of plants. I considered everything this way, from timing of blooms, colours and heights. It's a bit of a challenge and it was a rather imperfect project for me (non-artist) but at least I can imagine how things look. Country living magazine helped as a guide and I also like visiting the gardengate website (online extra), as well as BHG - just to guide me with the drawing part.

Anyway, you can subdivide a season and create drawings per division. (Examples, early spring, late spring - early summer, mid summer, late summer, early fall)

Thanks Ianna. That was very helpful. I was also considering using only simple symbols for representing the plants. It is a challenge for me also but I'm sure it will be worthwhile. Looking online for some helpful hints was a good idea. I got a lot of good info from there so thanks a lot for your help. It was helpful and much appreciated.
Clemmybug