Wicked Growth 19-19-19 Fertilizer Guide
- Old Cobblers Farm
- Jul 18
- 6 min read
Recommended Application Rates for 19-19-19 Fertilizer
The 19-19-19 fertilizer is a balanced, all-purpose fertilizer with equal parts nitrogen (19%), phosphorus (19%), and potassium (19%), ideal for promoting overall plant health in lawns, vegetables, flowers, and shrubs. It supports leafy growth, root development, flowering, and disease resistance.
Per Square Foot
General Use (e.g., Lawns, Gardens): Apply 1–2 teaspoons per square foot (equivalent to 0.5–1 pound per 100 square feet).
Method: Broadcast evenly, incorporate into the top 2–3 inches of soil, and water thoroughly.
Per Plant
Small Plants (e.g., Annuals, Small Perennials): Use 1–2 tablespoons around the base, 2–3 inches from the stem.
Medium Plants (e.g., Vegetables, Small Shrubs): Apply 2–4 tablespoons per plant.
Large Plants (e.g., Large Shrubs, Small Trees): Use 1/4–1/2 cup around the drip line.
Method: Distribute evenly, lightly work into soil, and water well.
Per Gallon of Water
Liquid Application: Dissolve 1–2 tablespoons per gallon of water for soil drenching or foliar feeding.
Method: Apply to soil or leaves (if specified), ensuring full dissolution. Use every 4–6 weeks.
Application Tips
Soil Testing: Test soil to confirm nutrient needs and avoid over-application.
Timing: Apply during active growth (spring/summer) for best results.
Safety: Wear gloves/mask; follow label instructions.
Application Frequency of 19-19-19 Fertilizer
Apply 19-19-19 fertilizer every 4–6 weeks during the growing season, based on plant needs and soil tests:
Lawns: 3–4 applications (spring to early fall).
Vegetables/Flowers: At planting and every 4–6 weeks during growth.
Trees/Shrubs: Early spring and late summer/early fall.
Note: Avoid over-fertilization; adjust based on soil test results.
Application Rate Differences for Established Plants and Seedlings
Yes, rates differ due to sensitivity:
Seedlings: Use 1/2–1 tablespoon per plant or a diluted solution (0.5–1 tablespoon per gallon of water) to prevent burn.
Established Plants: Apply full rates (1–2 teaspoons per square foot or 1 tablespoon–1/2 cup per plant) to support growth.
Note: Soil test to tailor rates and avoid nutrient imbalances.
Best Time of Year or Season to Apply 19-19-19 Fertilizer
Early Spring: Before planting or as growth begins for lawns, vegetables, and shrubs.
Early Summer: During active growth to support flowering and fruiting.
Early Fall: For lawns or perennials to boost winter hardiness.
Note: Avoid late fall applications to prevent frost-sensitive growth; confirm need with soil tests.
Application Timing Relative to Planting Stages
Before Planting: Incorporate 1–2 teaspoons per square foot into soil 2–3 weeks prior.
At Planting: Apply 1/2–1 tablespoon per seedling or 1–2 tablespoons per transplant, avoiding direct root contact.
During Active Growth: Use 1–2 teaspoons per square foot or 1–4 tablespoons per plant every 4–6 weeks.
Note: Adjust based on soil tests and plant requirements.
Timing Around Flowering, Fruiting, or Dormancy Stages
Flowering Stage: Apply before bud formation to support blooms with balanced nutrients.
Fruiting Stage: Use early in fruiting to enhance fruit quality; avoid excessive nitrogen to prevent leafy growth.
Dormancy Stage: Apply before dormancy for perennials; avoid during full dormancy to prevent runoff.
Note: Time applications for pre-flowering or early fruiting stages.
Timing Around Rain or Irrigation
Before Light Rain/Irrigation: Apply before moderate rain or irrigation to aid nutrient absorption.
Avoid Heavy Rain: Prevent runoff by avoiding application before heavy rain.
Moist Soil: Apply to moist soil, followed by light watering if needed.
Note: Monitor weather to optimize uptake and minimize runoff.
Application Methods for 19-19-19 Fertilizer
Topdressing: Spread 1–2 teaspoons per square foot for lawns/gardens; water in.
Side-Dressing: Apply 1–2 tablespoons along rows or around plants during growth.
Soil Incorporation: Mix 1–2 teaspoons per square foot into soil before planting.
Foliar Spray: Use sparingly (1–2 tablespoons per gallon) if specified; avoid leaf burn.
Note: Choose method based on plant needs; topdressing/side-dressing is most common.
Watering After Application
Yes, water in 19-19-19 fertilizer to:
Dissolve granules for root uptake.
Prevent leaf burn by washing off foliage.
Ensure even nutrient distribution.
Reduce runoff risk.
Note: Follow label watering guidelines.
Mixing 19-19-19 Fertilizer with Other Products
Yes, it can be mixed with compatible fertilizers/amendments:
Soil Test: Confirm nutrient needs to avoid over-application.
Compatibility: Avoid mixing with high-calcium products to prevent insoluble compounds.
Mixing: Blend thoroughly for uniform application.
Organic Amendments: Pair with compost/manure for soil health.
Safety: Wear gloves; test mixtures on a small area.
Note: Monitor plant response to avoid imbalances.
Suitability for Drip Irrigation or Fertigation Systems
Yes, if water-soluble:
Solubility: Ensure complete dissolution (1–2 tablespoons per gallon) to avoid clogging.
Filtration: Use filters to prevent emitter blockages.
Maintenance: Flush system regularly.
Timing: Apply during growth stages per plant needs.
Note: Verify product solubility and system compatibility.
Slow-Release or Frequent Application
The 19-19-19 fertilizer is typically quick-release, requiring applications every 4–6 weeks during the growing season. Check the label for slow-release formulations, which may need only 1–2 applications per season.
Suitability for Different Plants
The 19-19-19 fertilizer is versatile for general plant health:
Nitrogen (19%): Supports leafy growth for lawns/vegetables.
Phosphorus (19%): Enhances root development and flowering for vegetables/flowers.
Potassium (19%): Improves fruit quality and stress resistance for shrubs/trees.
Not Ideal For: Plants needing specific nutrient ratios (e.g., high-nitrogen greens).
Note: Soil test to match plant needs.
Fertilizer Burn Risk and Precautions
Yes, overapplication risks burn due to high nutrient content (19% each N-P-K):
Follow Rates: Use 1–2 teaspoons per square foot or 1 tablespoon–1/2 cup per plant.
Soil Test: Confirm nutrient needs.
Even Application: Use spreaders for uniformity.
Watering: Water thoroughly post-application.
Avoid Foliage: Prevent direct contact with leaves/stems.
Note: Adhere to label rates to prevent damage.
Sensitive Plants to Avoid
Avoid using 19-19-19 on:
Orchids/Cacti/Succulents: High nutrients risk burn or excessive growth.
Ferns: Prefer lower nutrient levels.
Seedlings: Sensitive to high concentrations; use diluted rates.
Acid-Loving Plants: Azaleas, blueberries may need specialized formulas.
Low-Nutrient Natives: Excess nutrients disrupt natural growth.
Note: Soil test to ensure suitability.
Interactions with Pesticides, Herbicides, or Other Products
Timing: Apply separately (days apart) to maintain efficacy.
Compatibility: Test mixtures to avoid reactions (e.g., with calcium-based products).
Plant Health: Avoid stressed plants.
Runoff Prevention: Time applications to avoid heavy rain.
Note: Check labels for specific guidance.
Safety for Pets, Kids, and Pollinators
Pets/Kids:
Ingestion: Store securely; ingestion may cause gastrointestinal upset.
Contact: Wear gloves; rinse skin/eyes if contacted.
Timing: Apply when pets/kids are absent; water in before re-entry.
Pollinators: Safe if not applied to blooming flowers; avoid runoff to water bodies.
Organic Alternatives: Consider natural options for added safety.
Note: Follow label safety instructions.
Soil pH and Effectiveness
Soil pH affects nutrient availability:
Optimal Range (pH 6.0–7.0): Maximizes uptake of nitrogen, phosphorus, and potassium.
Acidic Soils (pH < 6.0): Phosphorus binds with iron/aluminum, reducing availability.
Alkaline Soils (pH > 7.5): Phosphorus binds with calcium; micronutrients may be limited.
Soil Testing: Test pH and adjust with lime (to raise) or sulfur (to lower).
Note: Soil testing ensures effective nutrient use.
Leaching and Runoff Risks
Nitrogen (19%): High leaching risk as nitrate in sandy soils or heavy rain.
Phosphorus (19%): Low leaching but high runoff risk in heavy rain.
Potassium (19%): Moderate leaching; binds to soil but may move in low-CEC soils.
Minimizing Risks:
Apply per soil test recommendations.
Incorporate into soil to reduce runoff.
Avoid application before heavy rain.
Note: Proper management minimizes environmental impact.
Organic Certification Status
The 19-19-19 fertilizer is typically synthetic and not OMRI-listed or certified organic due to its chemical composition. Organic alternatives (e.g., compost, manure) may provide similar balanced nutrients and be certified. Check the label or OMRI database for confirmation.
Key Nutrients Supplied
Macronutrients:
Nitrogen (19%): Supports leafy growth and photosynthesis.
Phosphorus (19%): Enhances root development, flowering, and fruiting.
Potassium (19%): Improves fruit quality, disease resistance, and water uptake.
Micronutrients: Typically none unless specified; check label for additives.
Note: Supplement micronutrients if needed, per soil tests.
Formulation Purpose
The 19-19-19 fertilizer is formulated for general plant health, supporting leafy growth (nitrogen), root development and flowering (phosphorus), and stress resistance (potassium). It’s ideal for balanced nutrient needs but not specific growth stages.
Bio-stimulants, Mycorrhizae, or Beneficial Microbes
The 19-19-19 fertilizer typically includes only nitrogen, phosphorus, and potassium. It does not contain:
Bio-stimulants: Enhance nutrient uptake/stress tolerance.
Mycorrhizae: Improve nutrient/water absorption.
Beneficial Microbes: Promote soil health.
Note: Use organic amendments for these benefits if needed.
Storage Guidelines
Dry Location: Prevent moisture absorption to avoid caking.
Sealed Containers: Use original packaging or airtight containers.
Cool, Ventilated Area: Avoid heat and ensure air circulation.
Off the Ground: Use pallets to prevent dampness.
Child/Pet Safety: Store securely.
Note: Proper storage maintains efficacy.
Shelf Life and Expiration Concerns
The 19-19-19 fertilizer has an indefinite shelf life if stored properly:
Conditions: Keep dry, sealed, and cool.
Inspection: Check for clumping or discoloration before use.
Note: Follow manufacturer storage guidelines.
Special Handling Requirements
Humidity Sensitivity: Hygroscopic; store dry to prevent caking.
Corrosiveness: Mildly corrosive to metals (due to ammonium compounds); use plastic tools and clean metal equipment.
Safety: Wear gloves/mask to avoid irritation or dust inhalation.
Environmental Care: Avoid over-application to prevent runoff.
Note: Follow label instructions for safe handling.
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