I use a combination of things. I use the add plants section on here to list my plants with photos. I add the general location too.
then on A2 graph paper I draw a scale plan and use pencil to mark the location of the plants. Pencil so if they die or I move them I can rub them out and replace with the new sutff.

id do a scale map and a ledger if i was going to do it myself .

That ok what seaburn says,I always write down dates when things are, planted,when i sow seeds the dates etc put little notes about what colors where .Important note always make anote of your failures and sucesses.Ijust do it in a cheap diary its simple to do and you ref it when req.Also take year round photos of the garden different places and directions.

Fabulous ideas, thank you very much. I will start one this week.
Lynne x

...and so will I!...I have never had the time before!

If anybody is familiar with Microsoft access you could make a simple data base with all your information that you required that’s what I have done

And if you make a scale drawing of the garden, just put circles for where you have plants and use a number inside, then make a list of the numbers and what plants they are - takes up much less room on your drawing, and that's how I produce design drawings for clients.

Thank you all x. Keep the ideas coming please.
Lynne x