Using Horse Manure as Flower Fertilizer: Benefits and Limitations

Nutrient Profile

Typical analysis: ~0.7-0.3-0.6 (N-P-K)—low phosphorus, the key nutrient for flowering.

Age it: Minimum 6–12 months exposed to rain to leach salts. Fresh manure burns roots.
Supplement phosphorus: Mix in bone meal (3-15-0) at 5–10 lbs/100 sq ft.
Apply: 1–2 inch layer worked into top 6 inches of soil before planting.

Horse manure improves soil structure and adds organic matter, but for blooms, you must add a phosphorus source.

Fertilizer: Soil Testing in Arizona: Private Labs, High Cost, Nearby Alternatives; Cow vs. Horse Manure for Vegetables: Both Work — If Composted; Manure for Flowers vs. Vegetables: Composted Only, Match Nitrogen Form; Horse Manure Age: Older Is Better for Vegetable Plots; Too Much Horse Manure? How to Diagnose and Fix Nutrient Imbalance; Cow vs. Sheep Manure for Apple Orchards: Nutrient Comparison and Beyond; Evaluating Fire-Affected Horse Manure for Garden Use; Fresh Manure in the Garden: Hot vs. Cold, Composting Rules, and Salt Risks; Using Aged Horse Manure in Flower Beds: A Complete Guide; Using Composted Horse Manure Safely in the Garden

Garden Articles

Plants