Manure for Flowers vs. Vegetables: Composted Only, Match Nitrogen Form

Cow or horse manure for flower vs. vegetable beds? Both excellent — if composted. Fresh manure burns, brings weeds, pathogens. Aged stats: Horse 7-3-6, Cow 6-2-5, Chicken 11-8-5, Rabbit 24-14-6.

Critical Difference: Nitrogen Form

Vegetables/annuals need nitrate (NO3-) from bacteria in alkaline soil (pH >7). Perennials/shrubs need ammonium (NH4+) from fungi in acidic soil. Chemical fertilizers supply nitrate as salts — killing the bacteria that make it naturally.

Manure Risks

1. Fertilizer burn (salts, ammonia) — age 6+ months.
2. Weed seeds (horse especially) — composting kills them.
3. Pathogens — pasteurized/composted only for edibles.

Cautious Note

Some authorities advise NO manure on vegetable gardens (even treated). Compost without manure works fine.

Resources

• How to compost horse manure: U of Illinois PDF
• NRCS manure guide: USDA

Don't rush. Age properly. Test soil. Match nitrogen to plant type.