Cronk Micro 5-0-1 | Base Fertilizer with Calcium & Iron Size:500mL The pack works across all

The pack works across all plant types and growth stages

Calcium deficiency causes brown spots and weak cell walls

Using RO or soft water (lacks natural minerals)

and they won't sit on your shelves for too long

Cronk Micro 5-0-1 | Base Fertilizer with Calcium & Iron Size:500mL The pack works across allMicro 5 0 1 is the foundational nutrient in the Cronk Classic 3 Part system, delivering essential calcium, iron, and trace minerals that enable plants to utilize nitrogen, phosphorus, and potassium from other fertilizers. Without adequate micronutrients, plants cannot access macronutrients regardless of availability. Micronutrient deficiencies cause stunted growth, yellowing leaves, and poor yields even when NPK levels appear sufficient. Micro