I know many do remove the autumn leaves before they drop. I do not. For the obvious reason that the tree needs all the back flow of nutrients it can get before going into dormancy. It is a natural process, where the decaying leafs turns off their photosynthesis as days gets shorter and colder. Nutrients flow back and are stored for the following spring in stem, trunk and roots. There the stored nutrients will change their balance of frost protection for variations in temperatures during the cold period, and when spring arrives they will be activated and be the first gasoline for a fresh start of a new seasons growth.
Removing leafs before time, is therefore a little too hasty in the wish of getting trees nice and tidy for the winter, taking away the last feed for wintertime.
I clean of the withered leaves from the pot surfaces and benches when they are dropped, too avoid pests and fungus. But not before. Only trees that do not drop there leaves when they are entirely brown and dead, are cut off, for the same reasons. Beech for example keeps most of their leaves on during winter, but that is not necessary when overwintered as bonsai in a protected place, away from snow and cold sallow winds.
Always make an autumn clean up, to secure the health of the trees, but in time – not before time.
Frosts are hurrying up the leaves to fall. The beauty of late autumn shows, and with some early freezing nights also the leaf drop is forced to speed up. It is not necessary to pull the trees of their place on the outdoor garden benches now, because it will be warmer the coming days. The trees also benefits of a few freezing nights, killing some possible predators hiding underneath the bark and top soil.
It has been an unusual hot start on this years autumn season. Finally the colder weather has found its way and nature do as nature must do. Leaves slowly changes their colours, and begins preparation for winter.
Whatever you prefer to name this time of year autumn or fall, it is still one of my favourite times. The shifting from summer to winter calls on a colourful scenery in the landscape, garden or at the bonsai benches around here. Preparations for winter is coming nearer, but so far it is limited to few new stocks put in preparation for winter work (wiring mainly), and easy transplanting of bonsai who only needs a slight adjustments of the root ball. The green house has to be made ready for moving bonsai in in a few weeks. The time left is for enjoying the daily development of leafs on deciduous who shows their bright colours now and the days that follows.
The pictures shown are from the last two weeks app.