Landscaping bills two ways at once: installs with materials by the yard, and maintenance that runs all season. This template carries both on one invoice, the way June actually looks.
For anything with real material costs — plantings, hardscape, sod — yes: enough to cover the materials before you order them. Note it on the quote and credit it on the final invoice.
Monthly, listing the visits — like this template's "Weekly mowing — June" line. One invoice a month is easier for the client to approve and for you to track across thirty properties.
Bill the month's actual visits and note the makeup date — "3 of 4 visits completed; June 30 visit moved to July 2." The invoice stays honest and nobody audits memory in August.
Materials usually carry sales tax; labor and maintenance services vary by state. Keep materials and labor on separate lines, as here, and apply your state's treatment — your accountant can confirm it once.