When to Fertilize St. Augustine Grass in Florida

Some Florida lawns do not need phosphorous.
Some Florida lawns do not need phosphorous. (Image: palmier et plage image by lamechante from Fotolia.com)

Depending on the results of soil analysis, fertilization of St. Augustine grass is recommended in two to six applications from spring through fall. Frequency of fertilization is determined in part by the level of maintenance desired by the homeowner.

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North Florida

High maintenance St. Augustine lawns are fertilized with a complete nitrogen, phosphorous and potassium (NPK) fertilizer in March and September; with iron in June; and a slow-release form of nitrogen in May and June. Moderate maintenance lawns are fertilized with a complete NPK fertilizer in March and September; a slow-release form of nitrogen in May; and iron in June. Low maintenance lawns are fertilized with a complete NPK fertilizer in March and September, and iron in June.

Untimely fertilization results in water pollution.
Untimely fertilization results in water pollution. (Image: lamppost by the lake image by Pix by Marti from Fotolia.com)

Central Florida

High maintenance St. Augustine lawns receive a complete nitrogen, phosphorous and potassium (NPK) fertilizer in February and October; nitrogen in April; nitrogen in slow-release form in May and April; and iron in July. Moderate maintenance lawns receive a complete NPK fertilizer in March, September and October; iron in July; and nitrogen in slow-release form in May and August. Low maintenance lawns receive a complete NPK fertilizer in March and September, and iron in July.

Timely fertilization increases resilience to pests and diseases.
Timely fertilization increases resilience to pests and diseases. (Image: lawn image by Sergey from Fotolia.com)

South Florida

High maintenance St. Augustine lawns are fertilized with a complete nitrogen, phosphorous and potassium (NPK) fertilizer in February and November; nitrogen in April; and a slow-release form of nitrogen in May, July and September. Moderate maintenance lawns are fertilized with a complete NPK fertilizer in February and November; nitrogen in April; and a slow-release form of nitrogen in June and August. Low maintenance lawns are fertilized with a complete NPK fertilizer in March and October, and a slow-release form of nitrogen in May and July.

Grass clippings provide nitrogen to Florida lawns.
Grass clippings provide nitrogen to Florida lawns. (Image: lawn,grass image by Greg Pickens from Fotolia.com)

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