Use 1 capful (5 mL) for every 125 L (30 US gallons). This dose raises potassium by 2 mg/L. Repeat 2–3 times per week or as needed in response to signs of potassium deficiency in older leaves which include: chlorosis (yellowing), necrosis (death/browning), pinholes in leaves, and weak stems and roots.
Flourish Potassium™ Dosing Table
The following dosing tables provide the standard dose of Flourish Potassium™ for various water volumes. These dosing instructions apply to the 100 mL - 500 mL bottles. Please note that the 2L and 4L bottles of Flourish Potassium™ have larger cap volumes than the smaller bottles. This dose will increase the potassium by 2 mg/L.
| Water Volume | Dose in mL | Dose in caps | Dose in drops |
| 1 quart (1 L) | 0.04 mL | 1/120 Capful | 0.8 Drops |
| 1 gallon (4 L) | 0.16 mL | 1/30 Capful | 3.3 Drops |
| 5 gallons (20 L) | 0.83 mL | 1/6 Capful | 16 Drops |
| 10 gallons (40 L) | 1.7 mL | 1/3 Capful | 32 Drops |
| 20 gallons (80 L) | 3.4 mL | 2/3 Capful | 66 Drops |
| 30 gallons (125 L) | 5 mL | 1 Capful | 100 Drops |
| 50 gallons (200 L) | 8.5 mL | 1 2/3 Capful | 166 Drops |
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