Ideal Soil pH for Katsura (Cercidiphyllum)

ByAndrew

Katsura’s Optimal pH Range and Its Importance

Katsura (Cercidiphyllum japonicum) thrives in a soil pH range of 5.5 to 7.5, preferring slightly acidic to neutral conditions. This pH range is crucial for Katsura’s growth, distinctive leaf color changes, and overall health. Within this range, Katsura can efficiently absorb essential nutrients, particularly iron and manganese, which are vital for its vibrant autumn foliage and vigorous growth. The tree’s adaptability to various soil types contributes to its popularity in landscaping and as an ornamental specimen. While Katsura can tolerate a slightly wider pH range (5.0 to 8.0), maintaining the ideal range ensures the best performance and longevity. In highly acidic soils (below 5.0), Katsura may experience reduced nutrient availability, especially calcium and magnesium. In alkaline soils (above 7.5), the tree might suffer from iron chlorosis, affecting its characteristic leaf coloration. Proper pH management is essential for promoting healthy growth, maintaining the tree’s unique seasonal appearance, and ensuring its signature caramel-like fragrance in autumn.

Adjusting Katsura’s Soil pH

Lowering Soil pH:

  • Elemental sulfur
  • Aluminum sulfate
  • Iron sulfate
  • Organic mulch (e.g., pine needles, oak leaves)

Raising Soil pH:

  • Agricultural lime
  • Dolomitic lime
  • Wood ash (in moderation)
  • Bone meal

Testing Soil pH for Katsura Cultivation

  • pH test strips
  • Digital pH meter
  • Soil testing kit
  • Professional lab analysis
  • Home soil pH probe