• Wear gloves and eye protection when handling dry powder or concentrated solutions
• Avoid inhaling dust — use in well-ventilated areas or wear a dust mask when measuring
• Wash hands thoroughly after handling

• Store in a cool, dry place in the original sealed container
• Product is hygroscopic — it will absorb moisture from the air if exposed
• Keep out of direct sunlight and away from heat sources
• If powder clumps from moisture exposure, break it up — efficacy is not affected
• Keep away from children and pets

• Do not mix dry fertilizer with other products before dissolving in water
• Do not apply foliar sprays during peak sun hours or when temperatures exceed 85°F
• Avoid direct contact with plant leaves when applying concentrated solution to soil
• Water thoroughly after soil application to prevent root burn
• Boron caution: Apply only to crops listed on the label. Application to unlisted crops may cause serious crop injury
• Molybdenum caution: Application to forage or pasture crops may result in molybdenum levels that are toxic to ruminant animals (cattle, sheep). Do not apply to forage crops without confirming baseline Mo levels in the forage

• Eye contact: Flush with clean water for 15 minutes. Seek medical attention if irritation persists
• Skin contact: Wash affected area with soap and water
• Ingestion: Do not induce vomiting. Contact Poison Control (1-800-222-1222) or seek medical attention
• Inhalation: Move to fresh air. Seek medical attention if symptoms persist

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

Leafy greens consist largely of water, and potassium is the nutrient that controls water pressure inside plant cells (turgor pressure). The 36% potassium (as K₂O) can help support cell wall thickness for that perfect crunch, resistance to wilting under grow lights, and post-harvest quality. Without adequate potassium, lettuce tends to become limp and can lose market value more quickly. For a deeper look, read What's the Function of Potassium in Plants?

Lettuce is particularly sensitive to pH. If pH is too high, iron locks out (causing yellow leaves). If too low, calcium locks out (causing tip burn). For hydroponics, keep pH between 5.8-6.2 for the best balance. In soil, aim for 6.0-6.5. Check pH daily in hydroponic systems — lettuce responds quickly to pH drift. For a full guide to yellowing leaves and nutrient lockout, see 8 Reasons Why Plant Leaves Turn Yellow.

Tip burn is a calcium transport issue — calcium isn't reaching the fast-growing inner leaves quickly enough. This fertilizer does not contain calcium because calcium and phosphorus are chemically incompatible in the same solution. You must supplement with Cal-Mag Plus or Calcium Nitrate. Our balanced formula may help by keeping nitrogen moderate (which can reduce excessive growth rate) and providing high potassium (which supports calcium transport within the plant). Note that airflow, cultivar, humidity, and growth rate also influence tip burn risk — nutrition is one part of a complete management approach.

Yes. For baby leaf (3-4 weeks to harvest), use at 50-75% of standard concentration, apply every 5-7 days, and target EC of 0.8-1.2. For microgreens (7-14 days to harvest), use at 25% concentration after cotyledons emerge — a single application is usually sufficient with a target EC of 0.4-0.6.

Calcium and phosphorus are chemically incompatible in concentrated solution. When mixed, they form insoluble calcium phosphate that precipitates out and becomes unavailable to plants. Since our formula contains 15% available phosphate (P₂O₅), calcium must be applied separately. Use Cal-Mag Plus 2-0-0 or Calcium Nitrate 15.5-0-0 as a companion product.

Iron, manganese, zinc, and copper are EDTA-chelated so they remain soluble and plant-available across a wide pH range — particularly in alkaline irrigation water or high-pH growing media where unchelated mineral forms can precipitate out and lock up before reaching plant roots. Boron and molybdenum don't form the same insoluble compounds and are supplied in highly available mineral forms. For a full comparison, see Sulfate vs. Chelated Fertilizers.

Our fertilizer is highly hygroscopic, meaning it absorbs moisture from the air. Keep the bag sealed tight between uses and store in a cool, dry place out of direct sunlight. If it clumps from moisture exposure, simply break it up — the efficacy is not affected.

You might expect a leafy green fertilizer to have very high nitrogen, but too much creates problems: overly succulent tissues prone to disease, reduced shelf life, bitter flavors, and increased nitrate accumulation in leaves. Our 8% provides enough nitrogen for healthy chlorophyll production and leaf development without those downsides. For more on nitrogen's role in plant biology, read What's the Function of Nitrogen in Plants?

• Manufactured in Madera, California, USA
• Tested by independent third-party laboratories for purity and guaranteed analysis
• Registered with the California Department of Food and Agriculture (CDFA)
• Heavy metal analysis conducted by AgroLab/Matrix Sciences Inc. (December 2024) — results consistently well below required limits
• Iron, manganese, zinc, and copper fully EDTA-chelated for maximum bioavailability; boron and molybdenum supplied in highly available mineral forms

If you're not completely satisfied, we offer a 90-day money-back guarantee. Simply return the unused portion in its original packaging, and we'll process a full refund. No questions asked.

We're committed to sustainable practices, including:

• Recyclable packaging materials
• Precise nutrient formulation to reduce environmental runoff
• Support for integrated pest management (IPM) practices
• Promoting efficient nutrient delivery systems like hydroponics

1% of all profits go to our foundation, focused on improving educational opportunities for children in agricultural communities.

Family-owned since 1989. Based in Madera, California, we've been making gardens — and their humans — healthier for over 35 years.