FoxFarm soil schedule · mobile quick reference
FoxFarm Big Bloom feeding chart
Choose a grow stage and the amount of water you are mixing. The calculator scales FoxFarm's current soil-schedule amounts for Big Bloom, Grow Big, Tiger Bloom and Cal-Mag. The full chart remains visible below so the schedule is useful even without JavaScript.
Current soil-schedule notes: FoxFarm says to feed up to twice per week, use a pH range of 5.6–6.8, repeat week 4 for a longer vegetative cycle, and repeat week 12 for a longer flowering cycle. The current chart also marks SledgeHammer flushes after weeks 4, 7 and 10 at 2 tsp per gallon.
| Stage | Big Bloom | Grow Big | Tiger Bloom | Cal-Mag | EC | PPM |
|---|---|---|---|---|---|---|
| Seedlings & cuttings | 6 tsp | — | — | — | 1.00-1.20 | 700-840 |
| Week 1 | 6 tsp | — | — | — | 1.10-1.30 | 770-910 |
| Week 2 | 6 tsp | 1 tsp | — | 1 tsp | 1.70-2.10 | 1190-1470 |
| Week 3 | 6 tsp | 2 tsp | — | 1 tsp | 2.60-3.00 | 1820-2100 |
| Week 4 | 3 tsp | 2 tsp | — | 1 tsp | 2.40-2.80 | 1680-1960 |
| Week 5 | 3 tsp | 2 tsp | 1 tsp | 1 tsp | 2.50-2.90 | 1750-2030 |
| Week 6 | 3 tsp | 2 tsp | 1 tsp | 1 tsp | 2.50-2.90 | 1750-2030 |
| Week 7 | 3 tsp | 2 tsp | 1 tsp | 1 tsp | 2.60-3.00 | 1820-2100 |
| Week 8 | 3 tsp | 2 tsp | 2 tsp | 1 tsp | 3.40-3.80 | 2380-2660 |
| Week 9 | 3 tsp | 1 tsp | 2 tsp | 1 tsp | 3.00-3.40 | 2100-2380 |
| Week 10 | 3 tsp | — | 2 tsp | — | 2.10-2.50 | 1470-1750 |
| Week 11 | 3 tsp | — | 2 tsp | — | 1.80-2.20 | 1260-1540 |
| Week 12 | 3 tsp | — | 1 tsp | — | 1.40-1.80 | 980-1260 |
Source: FoxFarm Feeding Schedules and the manufacturer's current Soil Feeding Schedule, checked Oct. 5, 2026. This tool performs unit and volume math on manufacturer-listed rates; it does not create a new feeding recommendation. Check the current label and schedule, and adjust fertilization to plant response.
Using FoxFarm in hydroponics?
Hydroponic rates and products differ from this soil schedule. Use FoxFarm’s current hydroponic feeding schedule for hydro grows.
Product background & earlier soil chart
Fox Farm Nutrients are used in the vegetative and flowering / budding stages of growing marijuana, although FoxFarm markets its fertilizers for a wide range of plants, not exclusively cannabis. Always follow the product label and current feeding schedule for your growing medium. Fox Farm plant food nutrients are a very popular brand of indoor marijuana growing chemicals and nutrients. Fox Farm is sold in most every grow supply store as well as online (where I prefer to buy due to price). Fox Farm product line consists of Tiger Bloom, Big Bloom, Open Sesame, ChaChing, Beastie Bloom and Bush Doctor Sledgehammer. The last 4 Products are used in small quantities and only at specific times during the grow.
This earlier soil chart is for comparison. Use the manufacturer-linked schedule above when mixing nutrients.
Understand your nutrients
Optional measuring tools Paid links
Tools that can make this easier
These are optional tools that fit the process described above. Choose by the job and the specs that matter—not by a product badge or a star count.
pH meter
Check mixed solution/media
What matters: Calibration support and replaceable probes are useful decision factors.
Check current options on Amazon (paid link)EC/TDS meter
Verify nutrient concentration
What matters: Look for a clearly labeled EC or PPM scale.
Check current options on Amazon (paid link)Measuring syringes/pipettes
Measure liquid nutrients accurately
What matters: Graduation size should suit tsp/mL quantities used by the calculator.
Check current options on Amazon (paid link)Air pump + air stones
Aerate nutrient reservoirs
What matters: Size airflow to reservoir volume.
Check current options on Amazon (paid link)(paid links) As an Amazon Associate I earn from qualifying purchases.