SouthernGRO 15-0-15 Fertilizer with Iron

SouthernGRO 15-0-15 supplies nitrogen and potash with 2% iron and no guaranteed phosphate.

Where zero phosphate fits

The zero in 15-0-15 matters when your soil plan calls for nitrogen and potash but no added phosphate. The SouthernGRO formula also guarantees 2% iron. Phosphorus is not always needed on Florida turf. When a recent soil test shows adequate phosphorus, a zero-phosphate blend can fit that specific turf recommendation. This is not a blanket choice for every Florida lawn. Use the test for the exact lawn or planting area and follow the nutrient recommendation for that site.

Read the analysis before spreading

A 15-0-15 does not replace a balanced fertilizer. Its grade contains no guaranteed phosphate, so it is a poor match when a planting needs that nutrient. The 2% iron is an additional guaranteed nutrient, not a promise that every yellow leaf will turn green. Leaf color can be affected by soil conditions, water, roots, or other nutrient issues. Diagnose the cause before selecting a treatment. This formula is worth considering when the needed analysis includes nitrogen and potash, excludes phosphorus, and calls for an iron-containing blend.

Use the package rate

The rate depends on the use and the nutrient target. Do not borrow a rate from a 10-10-10 or 13-13-13 plan. Those formulas contain phosphorus and use a different grade; even a similar number of pounds would deliver a different nutrient mix. Follow a rate written for 15-0-15 or have the recommendation recalculated for this grade. That keeps the zero-phosphate choice tied to actual soil need rather than guesswork.

A straightforward SouthernGRO option

Before spreading, measure the area and calibrate the spreader to the intended rate. If the soil test calls for no phosphate, this grade keeps the zero-phosphate part of that recommendation clear while still supplying nitrogen and potash. Apply evenly, avoid doubled passes, and keep granules out of driveways and drains. Brush stray material back onto the target ground. Store dry and secured between uses. Record the area, date, and fertilizer grade after each treatment. If the soil test changes or the planting area is replaced, reassess the nutrient plan instead of repeating an old rate automatically.

Fertilizer analysis

At a glance