Bonsai in August We are now coming towards the latter stages of summer and the trees are starting to slow down their active growth in preparation for autumn and the onset of changes to their leaves if they are deciduous. Here is a quick generic guide to bonsai in August but for individual species you may need to adjust the guidance as well as for the developmental stage your bonsai trees are at.
Watering Continue to check your trees daily and water as required and you will have noticed they will still be taking up more water and dry out quicker in the hotter weather. Continue to maintain a higher level of watering at this stage. Water in the mornings ideally and if necessary water more than once a day.
Re-potting None required unless emergency repotting required where the pot is damaged or there is a pest concern or drainage issue. Try not to damage the roots during an emergency repot and just place the tree in another pot of the same size or larger for the time being until the correct repotting season without root pruning or disturbance.
Feeding This is the time to continue feeding while the trees are actively growing before they start to go into autumn. Organic feeds are preferable to chemical feeds including products like liquid seaweed and this can be fed daily as part of the watering regime or less often depending on the stage of development of the tree. Ideal feeding at this time is liquid feed as the watering regime has picked up and you can feed with each watering, and the general rule is little and often.
Pruning This is the time to prune back all excessive growth on deciduous trees and start to work on removing the larger leaves on a regular basis in preference of retaining the smaller leaves forming after the larger leaves have been removed.
Trimming Continue to trim long extension shoots to maintain the shape through regular trimming and remove the terminal shoot in some species to aid with creating a more compact form. Continue to prune tropical trees to maintain their shape and trim the new shoots.
Root pruning This is not applicable at present unless any trees are being repotted but for the majority of species they should already have been done.
Insects and pests Check for the repeat infestations of bugs and pests like green and black fly, red spider mite, scale insect, mealy bug as well as vine weevil beetles. With the warmer weather insect pests can start to build up numbers and are more likely to appear on the shoots and leaves and start causing foliage damage. Watch out for the on set of mildew and prune out any damaged leaves or treat any infestations if found. Spray with insecticide as required or once a month for pest prevention using products like SB Invigorator. Methylated spirits cotton buds are an effective method of removing scale insects from branches.
Moss and weed control Continue to keep this in check and treat or remove unwanted moss and remove any newly forming weeds.
Wiring Wiring can be started on some of the larger branches if the tree has been defoliated but otherwise it is not a good time to wire as the process can damage the foliage.
Protection Protect from the heat of the sun if the trees have a thin bark like Japanese Beech and provide additional shade and wind protection to avoid leaf scorch or wind burn of the leaves.
Assessment Continue to update your bonsai records and photograph your trees to record their progress.
Tools This is something everyone should do each time they use their tools but often it is not easy to do depending on how often you are using your tools. However, it is good practice to clean and sharpen your tools after use and this is a good time to go through your tool kits and clean them up before the start of the pruning season.
Display areas If you have trees out in display areas check that they are not drying out or getting too much sun and ensure they have shade if required as the temperatures during the day currently are fairly hot.
Propagation This is a good time to take semi ripe cuttings from this years growth.