Most of the gardening books or magazines will tell you that winter is the time to be looking through the seed catalogues: when it's too wet, cold and miserable to be out there gardening, we should all be checking out the catalogues and sending in orders.
Do you do that?
I don't! But I do use winter as a time to make plans.
Planning, for me, starts with the annual sort-out of the photos. I usually take a lot of hasty snaps over the year, and I don't always have time to label them properly, so this is a good opportunity to go through the backlog, naming them and filing them so that I can find any particular one when I want it. (Also a good chance to prune out any not-very-good photos!)
But I take photos for a reason, and usually, the reason is to remind me to do something, to identify something, or to remind of a plant that was either very good, or very bad.
Very good plants are worth repeating, and very bad ones need to be moved or replaced or dealt with in some manner, and I find that taking a photo at the height of their glory -or ignominy - is a great help months later, when I've forgotten what they looked like or, in some cases, forgotten exactly where they were...
So here I am in that no-man's land between Christmas and New Year: it's far too cold to work, and it's also too cold to go outside and do any potting up or propagating: so it's a good time to sit indoors in the warm, going through photos and making notes about jobs to be done once the weather warms up again.
And sometimes, it's just nice to look through the photos and to remember what happened last summer!