The very first step to running a professional agribusiness is to stop treating your farm’s wallet as your personal pocket.
Open a separate bank account or a dedicated mobile money (e.g., M-Pesa) till for your farm transactions.
Ensure all payments from buyers go directly into this farm account.
Pay yourself a fixed monthly salary from this account for your labor, and let the remaining profit stay in the farm business to fund future expansion and cover operational costs.
You do not need complicated accounting software. A simple physical notebook or a basic Excel spreadsheet on your phone is all you need. You must maintain two core logs:
The Expense Log (Cash Outflow): Write down every single shilling that leaves your business, including seedlings, manure, water bills, packaging, transport, and casual labor.
The Sales Log (Cash Inflow): Write down every single shilling that enters your business, including the date, buyer name, herb variety, kilograms sold, and total price received.
To set a profitable price for your herbs, you must know exactly how much it costs you to produce a single kilogram of that herb. This is your Cost of Production (CoP).
To calculate your CoP for a single crop cycle:

Let us look at a practical example for an 1/8-acre basil farm cycle:
Total operating expenses (seedlings, manure, water, packaging, transport, casual labor) = Ksh 35,000.
Total marketable basil harvested and sold = $500\text{ kg}$.

This calculation tells you that it costs you exactly Ksh 70 to put a kilogram of fresh basil on the market.
If a broker offers to buy your basil for Ksh 60 per kg, you know instantly to walk away, as you would be losing Ksh 10 on every kilogram sold.
If a restaurant buys it for Ksh 150 per kg, you know you are making a healthy net profit of Ksh 80 per kg ($150 – 70$).
In Limuru, Njeri cultivated coriander (dhania) and mint. A local broker approached her and offered to buy her entire mint harvest at a flat rate of Ksh 100 per kg. Initially, Njeri thought this was a fantastic deal because she had plenty of mint.
However, her daughter, who kept the farm’s simple record book, sat down to calculate their exact CoP. After adding up the costs of municipal water, organic manure, weeding labor, transport to town, and the family’s own time, they discovered their actual cost of production was Ksh 112 per kg. The “lucrative” contract was actually costing Njeri Ksh 12 of her own savings for every single kilogram she sold! Armed with this data, Njeri declined the broker’s offer and negotiated a new contract with a supermarket distributor at Ksh 180 per kg, securing her farm’s financial future.
| Date | Item / Service | Category | Quantity | Unit Cost (Ksh) | Total Paid (Ksh) |
| 12/05/26 | Raised-bed Manure | Inputs | 10 Sacks | 300 | 3,000 |
| 14/05/26 | Sweet Basil Seedlings | Inputs | 1,000 units | 10 | 10,000 |
| 15/05/26 | Bed digging & planting | Labor | 2 casuals | 500 / day | 1,000 |
| 20/06/26 | Plastic Punnets ($100\text{g}$) | Packaging | 200 units | 5 | 1,000 |
| Date | Customer Name | Herb Variety | Grade | Quantity (Kg) | Price per Kg (Ksh) | Total Received (Ksh) |
| 25/06/26 | Bella Italia Restaurant | Sweet Basil | Grade 1 | $15\text{ kg}$ | 250 | 3,750 |
| 28/06/26 | Naivas Supermarket | Sweet Basil | Grade 1 | $40\text{ kg}$ | 400 (packaged) | 16,000 |
Crucial Things to Keep in Mind:
Write It Down Immediately: Do not wait until the end of the week to record your expenses. Carry a small notebook in your pocket or use your mobile phone to write down every transaction the moment it happens.
Valuate Your Own Labor: Always include your own time and labor in your Cost of Production. Even if you do not pay yourself cash, write down what it would cost to hire someone else to do your job.
Track Your Losses: Keep a record of any crop losses (due to pests, rotting, or grading). This helps you identify where your business is losing money and improve your field efficiency.