Mountain Ash Berry Production: Fertilization Timing

European mountain ash (zone 5) had berries year 1, none year 2, only 3 clusters year 3. Owner asked about 0-10-10 fertilizer timing.

Advice

• Berry production varies yearly with bloom-time weather.
• Apply 0-10-10 now (fall) and again in spring after last frost.
• Rate: 1 lb per inch trunk diameter, scattered and watered in (or before rain).
• Production increases with tree age.