Labor by crew hours
Landscaping labor is usually billed as crew hours: two workers for six hours is 12 labor hours at one rate. State the crew size and the rate so the client can check the arithmetic. If the job includes a foreman or equipment, add a separate line rather than hiding it in the hourly rate.
Materials and disposal
Mulch, soil, plants, stone and turf are material lines with quantities. Green-waste disposal is its own cost and is often forgotten — a truckload of branches is not free to dump. Keep supplier receipts for the material and a disposal receipt for the dump; a client who questions the total will ask for them.
Maintenance vs project
Recurring maintenance is billed per visit or per month, with the schedule in the notes. A project — a new bed, a patio, irrigation — is billed per job or by progress draw. Do not mix a monthly maintenance fee and a project invoice on one page unless the client asked for a combined bill.
Weather and rescheduling
Rain days happen. Put the reschedule policy in the contract and note any weather delay in the invoice notes. If the delay pushed the job into another month, bill the work that was actually completed rather than the original schedule.
Tax and terms
Materials are often taxable while the service may not be, and the rules vary by state. Commercial property managers often want Net 30, a PO number and a certificate of insurance with the invoice.