Weed control is what actually dominates my garden management. The west of Britain has such mild winters that many wild pasture grasses and things like creeping buttercup can grow almost all year round. If you live in the country chances are you'll have a massive 'weed seed bank' in the soil, so any soil disturbance brings up more seeds to germinate. Long-term, perennials form good solid clumps which tend to be weed-resistant and undisturbed soil develops a layer of moss which seems to reduce weed seed germination. At this time of year in the border, you can see some early Geranium phaeum and G. endressii growth and some evergreen Liriope, but the green haze is germinating grasses. Now is a good time to get on top of weeds, and then the rapid growth of perennials in spring will soon form a good solid canopy.
Seedlings of I'm not quite sure what - perfect for flame-gunning.
In the end, as plantings mature, the range of weed seed in the top layer of soil gets exhausted, and gradually increasing clumps of herbaceous dominate, so it becomes less of a problem, but I think I've still got quite a few more years of serious weed control yet.
For those who don't garden in an Atlantic climate, you probably have no idea how quickly or how comprehensively pasture grasses can take over and completely suffocate all other plantlife, apart from brambles (their co-conspirators in garden overwhelming) and decent sized woody plants. Even let loose into other climate zones they can do a pretty good job of eliminating other plants too.
Some years ago I did experiment with growing perennials in rough grass, but the fact is that very few species will co-exist, primarily because of the ability of Atlantic climate grasses to grow at any temperature above freezing. I still do have an experimental area for this, but for the rest of the garden, it has to be serious weed control.