What to do In May
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What to do In May
Autumn and the days are cooling down with occasional rain. But beware of warm days. Little bits of rain are often not enough to thoroughly water your trees. Often trees with a lot of foliage will prevent the water from reaching the soil. Trees standing in protected areas (like close to a wall, etc.) can also not receive any rain. Keep track of the moisture in your trees’ soil and water accordingly.
Growth on deciduous trees has stopped and several have already lost their leaves. Trees like maples show beautiful autumn colors. Some White stinkwoods will already be without foliage. Deciduous trees that have been defoliated during summer will lose their leaves later.
Several olives are showing new growth.
Pruning
Do not prune any of the deciduous trees. Pruning deciduous trees now will cause the trees to start pushing new buds. These new soft buds will only weaken the tree before they will stop developing or even die off during the winter. The tree will also not get enough rest, and this can cause smaller branches to die back.
Let leaves fall of your trees on their own time. Trees recover a lot of nutrients from old leave before dropping them. That’s why leaves change colour in autumn. If you remove the leaves to early the tree will lose that energy needed to get through winter.
This is an important time in keeping track of the development of your junipers (apex growth) as well as the pruning and development of your pines.
Next month we will start to work on Pines (pruning, styling and needle plucking)
Have a look at these articles by Jonas Dupuich from Bonsai Tonight describing Pine work.
Decandling black pine bonsai – an in-depth guide
Fertilizing
If the new growth on your pines has hardened off, you can start feeding them. Feed young pines that are in the development stage every four weeks and older pines in their refinement stage every six weeks until the end of winter. This will help the pine to build up strength for spring pruning.
Don’t feed deciduous trees but evergreens showing growth can be fed.
Repotting
Do not pot any trees at this stage.
Pests and diseases
Deciduous trees that already lost their leaves can be sprayed with diluted lime sulfur. It’s best to buy each year a fresh batch of lime sulfur. Lime sulfur oxidizes and becomes less effective after a year.
This can be done towards the end of May. Spray again 10 days later to kill pests that survived the first spray. Mix the lime sulfur with water in a ratio of 1 part lime sulfur to 30 parts water. Spraying deciduous trees with lime sulfur while they are dormant will kill off unwanted pests and their eggs as well as other diseases. Cover unglazed pots when you spray the trees with something like glad wrap to prevent the lime sulfur from staining these pots.
You can also disinfect old pots and training containers with Jeyes fluid before reusing them.
Thrips – Also look out for signs of Thrip and woolly aphid on your Wild Olives. On the first sign of marks on the Olive leafs spray your trees. Look for white fly on the underside of the leaves of Olives. Spray with Rosecare or Plantcare or apply Koinor as a soil drench to control Thrip.
Aliette – Spray your olives with a preventative spray for root rot.
Styling and design
Check the wire on your trees. Trees are putting down a lot of wood on their trunks and branches and can cause wire bite. If wired branches haven’t been set yet and tend to move back to the original position, wire the branch again but in the opposite direction.
General maintenance
Remove moss from trees with soft bark, like cork bark elms, acacia etc. Leaving the moss on the trunks will cause the bark to rot. Also remove moss from the soil. Moss retains a lot of moisture in the soil which can cause root rot on trees like olives.
Carefully remove your moss and place it in single layers in a shallow seed tray and keep it wet until spring. There are many different uses for moss. You can place moss on the soil of newly repotted trees. It prevents the soil from being washed away during watering. Make a little moss garden, use it as decoration in saikei or forest plantings. Decorate soil of show trees, make a terrarium. The list goes on.
You can also kill the moss by spraying it with vinegar (undiluted grape vinegar). The vinegar will kill the moss and it can then be carefully removed with tweezers from trees with soft bark. Do not spray the leaves of the bonsai with vinegar.
You can clean up both black as well as white pines now by removing old brown needles.
Keep weeds under control.
Remove dead leaves from the pots and shelves. Dead leaves only supply hiding places for pests.
You can start cleaning and sterilizing your shelves with a strong mixture of Jeyes fluid at the end of May. Remove the bonsai from the shelves. Do any necessary repairs and remove all old soil and leaves from the shelves. Then spray the shelves with a strong mixture of Jeyes fluid. Wait till the smell is gone before replacing your bonsai.
Winter pruning is around the corner. Make sure your pruning tools are sharp, oiled, and sterilized.
Sharpening tools
Make use of a good quality sharpening tool to sharpen your tools. Tools are expensive and using the wrong sharpening tools can damage the tool beyond repair, causing damage to your bonsai.
Sterilize tools
With all the new diseases around, now is a good time to learn to regularly clean and sterilize your tools. A good method is to lace your tools in an alcohol like mentholated spirits. Don’t use heat like open flames to sterilize your tools. Excessive heat can affect the hardness qualities of your tools, affective losing their sharp cutting edge, etc.
Regular sterilization helps to prevent the spreading on diseases between trees. When we prune our trees, we cause open wounds that’s the ideal entry point for diseases to enter.
Start shopping around for new potential bonsai stock. Most of the trees in nurseries have already stopped developing and are only putting down hard wood, increasing their trunks. Shop around to be first to find the best stock.
Also start looking around for good compost and other ingredients for your soil mixtures so that in winter you know where to find the best soil for your trees.
Collecting trees
You can start collecting Wild Olives in May. Olives can also be potted from middle to end of May till August.
Make sure your tools for collecting trees from the field are also ready, sharp and in a good condition.
You will need a strong spade, saw, pruner and good set of gloves to protect your hands.
If you are not experienced in collecting trees, then ask one of the experienced members to give you some advice on what you will need and what you need to do. It’s a terrible waist to collect a tree from the wild and then to kill it because you don’t have the necessary knowledge on collecting trees.
Also remember to first find the bonsai in the tree that you are about to collect before digging it out. I’ve seen many trees been collected at club digs by over eager members who then afterwards have no idea of what to do with the tree. Ask an experienced member to assist you in your choice. If you can’t see the bonsai in the tree then rather move on. Look for another tree. Don’t remove a tree from the field if you’ve got no use for it.
And most importantly – Remember Mother’s Day on the10th of May. If she’s not into bonsai, it’s time to take some of your bonsai budget and spoil one of the most important persons in your life, your granny, mother, wife, and mother of your children.
A tip – special time spent with the mothers in our lives is appreciated the most!
Stephen
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