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Mountain Ash Not Blooming: Fertilize for Flowers

High Nitrogen Suppresses Fruit

15-year-old mountain ash no flowers/berries 2 years running. Likely excess nitrogen. Use bloom-promoting fertilizer (0-10-10 or 15-30-15). Weather also affects bloom. Manure = too much nitrogen.

Trees: Mountain Ash Berry Failure and Tip Dieback: Pollination and Twig Borer; Propagating Mountain Ash (Rowan) from Green Wood Cuttings; Raywood Ash Slow Growth: Addressing Root Girdling and Fertility; Mountain Ash Root Depth for Removal Planning; Mountain Ash Berry Production: Fertilization Timing; Don't Use Horse Manure When Planting Colorado Blue Spruce; Planting and Pruning Raywood Ash: Avoid Topping!; Mountain Ash Not Fruiting: Patience After Transplant; Fertilizing Young Maples and Willows for Canopy Density; Choosing Fertilizer for Citrus Trees: Practical Advice for Any Region

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