Quercus robur (oak)

Links

• http://www.bonsai4me.com/SpeciesGuide/Quercus.html
  • full sun and good air circulation
  • shaded branches have a tendency to die-back
  • should be repotted yearly as buds start to move in spring until the tree is 10 years or older, then every 2-3 years
  • however it is possible that repotting after the first leaves have opened or in early autumn is better
  • trim new shoots and pinch out apical buds unless extension is required
  • very susceptible to mildew problems
• https://www.bonsaiempire.com/tree-species/oak
  • airy place in full sun during the growing season
  • water thoroughly when the soil gets dry, but avoid constant soil wetness
  • hard pruning is done in early spring before the buds open
  • new shoots are cut back leaving two leaves
  • young oaks should be repotted every two years, older ones every three to five years in spring before the buds open
  • don't cut off more than one third of the roots
  • suffer from powdery mildew
• https://www.mistralbonsai.com/en/all-about-bonsai/bonsai-datasheets/mediterranean-bonsai/quercus-sp/
  • direct sunlight
  • keep away from freezing conditions to protect its roots
  • repot every 2-3 years, at the end of the winter
  • 100% akadama or mixed with 30% of volcanic clay
  • structural pruning can be carried out in winter
  • once the leaves are fully grown cut a few back and leave 2 new pairs