Old Cobblers Farm™ Wicked Organics Bone Char

Natural Slow-Release Phosphorus Fertilizer

Boost your garden’s flowering, fruiting, and root strength with Old Cobblers Farm™ Wicked Organics Bone Char 0-16-0 — a premium, eco-conscious phosphorus fertilizer derived from calcined animal bones. With 16% available phosphate (P₂O₅), this bone char product provides long-lasting phosphorus without the risk of nutrient leaching, making it ideal for sustainable soil building, organic gardening, and high-performing landscapes.

If you’ve been searching for terms like “slow release phosphorus fertilizer for flowering plants,” “organic bone char fertilizer for root crops,” or “natural phosphorus amendment for soil fertility,” this product delivers precisely that.

Key Features & Benefits

Highly effective phosphate source: 16% available phosphate supports strong root development, enhanced flowering, fruit set, and seed production.

Slow-release phosphorus: Bone char dissolves gradually in the soil, ensuring nutrients become available over time; this minimizes runoff and helps maintain stable soil fertility. Research shows that bone char can increase phosphorus availability significantly, especially in phosphorus-deficient soils. 

Stability and sustainability: Because bone char is minimally soluble, it doesn’t leach easily, making it suitable for long-term applications and organic growing programs. 

Supports flowering & fruiting: Great for bulbs, flowering perennials, fruiting trees, and vegetable crops — anywhere phosphorus is the limiting nutrient.

Improves soil phosphorus over seasons: Ideal for pre-season soil preparation or planting time when you want to build up soil P levels sustainably.

Best Uses & Ideal Crops

Bone Char 0-16-0 works especially well in:

Flowering bulbs, perennials, and ornamental shrubs — helps establish bloom buds earlier and more fully.

Fruit trees & shrubs — apples, citrus, figs, berries when soil phosphorus is low.

Vegetables & root crops — carrots, onions, potatoes — for stronger root systems and better flowering or fruit/seed set.

Soils with phosphorus deficiency — especially in organic gardens or soils where synthetic phosphates are excluded.

New plantings and transplantings — applications at planting time to ensure roots access phosphorus as they establish.

How to Use

Soil testing first: Because phosphorus is mobile in soil ecosystems and over-application can suppress uptake of other nutrients (like iron or zinc), test soil first to know whether extra P is needed. 

Application timing: Best applied at planting or during pre-season soil preparation; works well in spring or just before active growth starts.

Application rate & method: Incorporate into the planting hole, mix into topsoil, or broadcast and gently work into the soil. Amounts depend on soil test, crop type, and soil conditions.

pH considerations: Bone char performs better in acidic to slightly neutral soils (pH < ~7). High alkaline pH can reduce phosphorus availability. If soil is alkaline, strategies like using acidifying amendments or fertilizers may improve efficacy. 

Why Choose Wicked Organics Bone Char 0-16-0?

If you want a long-term, organic phosphorus fertilizer that supports root health, flowering, fruit set, and soil fertility — without quick dissolving or nutrient losses — this bone char is an excellent choice.