• Wear chemical-resistant gloves when handling concentrate solutions
• Use a dust mask or respirator when measuring powder in enclosed or low-ventilation areas
• Safety glasses or splash goggles recommended when mixing concentrates
• Wash hands thoroughly after handling

• Store in sealed, moisture-proof containers — product is hygroscopic and will absorb ambient moisture if left open
• Keep in a cool, dry location away from direct sunlight and heat sources
• Do not store near combustible materials, oils, or organic compounds — potassium nitrate content is an oxidizing agent
• Keep out of reach of children and pets
• Shelf life is approximately 24 months when stored properly in sealed packaging

• Apply only as directed on the product label
• Dissolve completely before applying — do not apply dry product directly to foliage or plant crowns
• Do not apply to waterlogged or frozen soils
• Ensure adequate soil moisture before applying — never drench bone-dry root zones
• Avoid application during periods of extreme heat or drought stress
• Do not mix with calcium nitrate, calcium chloride, or chloride-based fertilizers in the same concentrated stock tank
• Dry product: store away from combustible materials per standard fertilizer handling practice (potassium nitrate is an oxidizer)

• Eye contact: Flush immediately with clean water for at least 15 minutes; seek medical attention if irritation persists
• Skin contact: Wash affected area thoroughly with soap and water
• Ingestion: Do not induce vomiting; seek medical attention immediately
• Inhalation: Move to fresh air; seek medical attention if symptoms persist

Refer to the Safety Data Sheet (SDS) for complete safety information.

DTPA chelated iron remains stable and plant-available up to approximately pH 7.5, while EDTA chelated iron begins to break down above approximately pH 6.5. For growers using alkaline municipal water or growing in soils that trend toward neutral pH, the DTPA form can deliver meaningfully more usable iron to the plant. If your irrigation water or soil pH consistently runs above 7.5, a separate EDDHA iron product may be appropriate as a supplement to this program.

Calcium and phosphate cannot coexist in a concentrated solution — they react immediately to form insoluble calcium phosphate, which precipitates out of solution and becomes unavailable to plants. This is a fundamental chemistry constraint, not a formulation choice. Growers requiring calcium supplementation should apply Calcium Nitrate 15.5-0-0 in a separate tank or on alternating application days.

Yes. Blueberries are acid-loving crops with similar nutrient requirements to azaleas and rhododendrons. The balanced 10-5-10 analysis, chloride-free potassium, and complete micronutrient package including chelated iron DTPA and manganese address the nutrients most commonly limiting in blueberry programs. Apply at 2 g/L monthly during active growth. Monitor soil pH annually — blueberries prefer pH 4.5–5.5, and consistent use in already-acidic soils should be paired with periodic pH checks. Learn more about fertilizing berry plants.

The 10.4% combined sulfur is a natural result of using sulfate-form ingredients throughout the formula. In neutral to alkaline soils, this can contribute a beneficial mild acidifying effect at the root zone over time. In soils already at or below pH 4.5, you should monitor pH seasonally with regular use and reduce application frequency if pH continues to trend downward. The ammoniacal nitrogen fraction also contributes to mild acidification — both effects work in favor of acid-loving plants in most garden soils.

Yes. All ingredients are water-soluble and compatible with standard drip, overhead, and injector systems at recommended dilution ratios. For injector use, prepare concentrate at 20 g/L (100:1 ratio) or 40 g/L (200:1 ratio). Do not mix this concentrate with calcium nitrate or calcium chloride in the same stock tank — always dilute each source independently, and jar-test unfamiliar additive combinations before injecting into a production system.

The final full-rate application should be made in early September. Feeding after this point can stimulate tender new growth that is vulnerable to cold damage as plants move toward semi-dormancy. Suspend feeding through late fall and winter until new buds begin to break in late winter or early spring, then resume at the early-spring rate to support bud set and initial flush growth.

Yes. Hydrangeas are acid-loving ornamentals that respond well to the balanced 10-5-10 formula. The sulfur contribution from the sulfate-form ingredients can support a mildly acidifying soil effect, which is associated with blue flower color development in varieties that change color with soil pH. Apply at 2 g/L monthly during active growth. Note that flower color in hydrangeas also depends on aluminum availability and cultivar genetics — nutrition is one factor among several.

Azaleas, camellias, rhododendrons, and other ericaceous plants preferentially take up ammonium nitrogen over nitrate. When plants absorb ammonium, the uptake process releases hydrogen ions at the root surface, lowering local pH — an effect that improves the availability of iron and other micronutrients in the pH range these plants prefer (4.5–6.0). This formula delivers 35% ammoniacal nitrogen from MAP and ammonium sulfate, 52% as urea, and 13% as nitrate. The ammoniacal plus acidifying urea fraction dominates the acidifying behavior while the small nitrate fraction broadens performance consistency across varying soil temperatures and water chemistry.

• CDFA registered fertilizer
• Independently lab tested for heavy metal content — results consistently well below required limits
• Manufactured at our facility in Madera, California
• Documentation maintained for every production run and available upon request

Not satisfied? Return within 90 days for a full refund — no questions asked.

• Chloride-free formulation reduces unnecessary salt loading in ornamental soils
• Recyclable packaging
• No unnecessary fillers or additives

1% of sales support the Greenway Foundation's youth gardening programs.

Family-owned since 1989. Making gardens — and their humans — healthier for over 35 years.