A tailored maintenance schedule could be exactly what you are looking for. It can be based on regular weekly or fortnightly visits, or on a more ad-hoc basis - whatever suits you. 

I have a flexible approach as certain gardens require more or less frequent attention at different times of the year. Some need merely a spring-clean, periodic tidy-ups and putting to bed as winter approaches. Others need more intensive work throughout the seasons. Whilst I prune, weed, cut back, plant and propagate, I do not mow lawns or trim hedges. 

If required, I can supply by email after each visit a short note of work carried out and future goals outstanding. I have found this task list useful to keep us both on track, and particularly helpful if more significant changes, moves or additions to a scheme or border have been proposed and agreed.